Vizio P Series Quantum X 2020 TV Review

Tested using Methodology v1.6
Updated Nov 11, 2020 at 09:53 am
Vizio P Series Quantum X 2020 Picture
8.3
Mixed Usage
Value for price beaten by
: none
8.5
Movies
Value for price beaten by
: none
8.0
TV Shows
Value for price beaten by
: Hisense U6G
7.9
Sports
Value for price beaten by
: Hisense U6G
8.8
Video Games
Value for price beaten by
: none
8.6
HDR Movies
Value for price beaten by
: none
8.7
HDR Gaming
Value for price beaten by
: none
8.0
PC Monitor
Value for price beaten by
: LG NANO90 2021
Type LED
Sub-Type
VA
Resolution 4k

The Vizio P Series Quantum X 2020 is a great 4k TV that delivers stunning picture quality. It has a VA panel with a high contrast ratio, which is further enhanced by a full-array local dimming feature, allowing it to produce deep blacks. Its high peak brightness fights glare easily and delivers an exceptional HDR experience with bright highlights. It has a fast response time and a Black Frame Insertion feature, resulting in clear images in fast-moving scenes. Its low input lag should please most gamers, and it supports variable refresh rate (VRR) to reduce screen tearing. Unfortunately, it has pretty narrow viewing angles, so it might not be the best option for wide seating arrangements. Also, even though its SmartCast interface is user-friendly, it doesn't have as many apps as other platforms since Vizio doesn't have an app store.

Note: Our unit has a reddish tint that's present when displaying an image from any of its HDMI ports, which is why some of the photos in the review look a bit red. It isn't due to calibration, as it persists even after performing a calibration reset. We attempted a different calibration to address this issue and it removed the red tint; however, it caused yellow-green lines to appear when displaying shades of white or blue. As such, we're keeping the original calibration.

Our Verdict

8.3 Mixed Usage

The Vizio P Series Quantum X 2020 is great for most uses. It gets very bright and handles reflections well, making it a good choice for watching TV shows or sports during the day. It performs incredibly well in dark rooms, as it can produce deep and inky blacks for watching movies or playing video games. It has low input lag, a fast response time, and a high refresh rate to deliver an extremely responsive gaming and desktop experience. Unfortunately, its VA panel has narrow viewing angles, so it isn't the best option for wide seating areas.

Pros
  • High contrast ratio.
  • Can get very bright in SDR and HDR.
  • Excellent reflection handling.
Cons
  • Poor viewing angles.
8.5 Movies

The Vizio P Series Quantum X 2020 is excellent for watching movies. It has an outstanding contrast ratio that's further enhanced by its full-array local dimming, producing inky blacks for a fantastic dark room viewing experience. It upscales 1080p content well and can remove judder from 24p sources and native apps. Unfortunately, there's visible blooming around bright objects, which can be distracting in dark scenes.

Pros
  • High contrast ratio.
  • Great local dimming feature.
  • Exceptional black uniformity.
  • Upscales 1080p content well.
Cons
  • Poor viewing angles.
8.0 TV Shows

The Vizio P Series Quantum X is great for watching TV shows. It gets incredibly bright and has excellent reflection handling, providing great visibility in well-lit rooms. Sadly, its narrow viewing angles make images look washed out from the sides, which isn't ideal if you like walking around while watching. On the upside, its VA panel is immune to permanent burn-in, so you don't have to worry about leaving it on the same news channel all day.

Pros
  • Can get very bright in SDR and HDR.
  • Excellent reflection handling.
  • Upscales 1080p content well.
Cons
  • Poor viewing angles.
7.9 Sports

The Vizio P Series Quantum X is good for watching sports. It has excellent reflection handling and gets very bright, providing great visibility even in the brightest lighting conditions. Fast-moving scenes look clear thanks to its quick response time and Black Frame Insertion feature. It isn't the best option for watching with a large group of people, though, as its VA panel's poor viewing angles make images look washed out from the sides.

Pros
  • Can get very bright in SDR and HDR.
  • Fast response time.
  • Excellent reflection handling.
Cons
  • Poor viewing angles.
8.8 Video Games

The Vizio P Series Quantum X 2020 is excellent for gaming. It provides an incredibly smooth and responsive experience thanks to its low input lag and high refresh rate. It has a quick response time to deliver fast-moving scenes with minimal motion blur and a Black Frame Insertion feature to further improve clarity. Additionally, it supports variable refresh rate to reduce screen tearing. It has an outstanding contrast ratio and exceptional black uniformity, making it a fantastic choice for gaming in the dark.

Pros
  • High contrast ratio.
  • Fast response time.
  • Low input lag.
Cons
  • Poor viewing angles.
8.6 HDR Movies

The Vizio P Series Quantum X 2020 is excellent for watching movies in HDR. It has a high contrast ratio to produce deep blacks, an excellent HDR color gamut, and it gets more than bright enough to make highlights pop. It has a great local dimming feature, but the blooming can be a bit distracting, especially if you tend to watch with subtitles.

Pros
  • High contrast ratio.
  • Can get very bright in SDR and HDR.
  • Great local dimming feature.
  • Exceptional black uniformity.
Cons
  • Poor viewing angles.
8.7 HDR Gaming

The Vizio P Series Quantum X 2020 is excellent for gaming in HDR. Gaming feels smooth and responsive, and there's support for variable refresh rate technology to help minimize screen tearing. HDR content looks amazing, as it has an excellent color gamut and high peak brightness, allowing it to produce rich colors and bright highlights. Its high contrast ratio, full-array local dimming, and exceptional black uniformity make it a fantastic option for dark room gaming.

Pros
  • High contrast ratio.
  • Can get very bright in SDR and HDR.
  • Fast response time.
  • Low input lag.
Cons
  • Poor viewing angles.
8.0 PC Monitor

The Vizio P Series Quantum X is a good TV for use as a PC monitor. It has low input lag, fast response time, and can display proper chroma 4:4:4. It gets very bright and handles reflections well. Unfortunately, its VA panel has poor viewing angles, so the edges of the screen may look washed out if you sit too close.

Pros
  • Can get very bright in SDR and HDR.
  • Fast response time.
  • Low input lag.
  • Excellent reflection handling.
Cons
  • Poor viewing angles.
  • 8.3 Mixed Usage
  • 8.5 Movies
  • 8.0 TV Shows
  • 7.9 Sports
  • 8.8 Video Games
  • 8.6 HDR Movies
  • 8.7 HDR Gaming
  • 8.0 PC Monitor
  1. Updated Jul 26, 2021: We added two videos showing the local dimming performance with real content. We also retested 4k @ 120Hz support from the PS5 and a PC, and found that it's still skipping frames if Game Low Latency is enabled.
  2. Updated Mar 01, 2021: Converted to Test Bench 1.6.
  3. Updated Oct 21, 2020: We've retested the contrast ratio, local dimming, and peak brightness with the latest firmware update (version 5.10.13.1-2).
  4. Updated Oct 01, 2020: Review published.
  5. Updated Sep 25, 2020: Early access published.

Video

Test Results

perceptual testing image
Market Context
Market Context
Market Context

The Vizio P Series Quantum X 2020 is Vizio's flagship LED TV, directly replacing the Vizio P Series Quantum X 2019. It's also marketed as the Vizio P Series Quantum X 2021. Its main competitors are the Samsung Q80/Q80T QLED, Sony X950H, and the Hisense H9G.

Design
Design
Style
Curved No

The Vizio P Series Quantum X has an excellent design. It's simple and clean, with thin borders and wide-set feet.

Design
Stand

The feet are set almost as wide as the TV, so you need a large surface to put it on if you don't plan on wall-mounting it. The stand supports the TV well, and it only wobbles a little bit.

Footprint of the 75" stand: 57.3" x 13.2"

Design
Back
Wall Mount VESA 400x400

The back of the TV is plain. Some of the inputs are bottom-facing, but they're still easy to access when wall-mounted. Unfortunately, there's no cable management.

Design
Borders
Borders 0.35" (0.9 cm)

The borders are very thin on all sides and aren't distracting.

Design
Thickness
Max Thickness 2.72" (6.9 cm)

The Vizio P Series Quantum X is thin and doesn't stick out when wall-mounted.

8.0
Design
Build Quality

The Vizio P Series Quantum X 2020's build quality is great and almost identical to the Vizio P Series Quantum 2020. It's entirely made out of plastic, but the construction feels sturdy, and there aren't any obvious gaps. The stand supports the TV very well and doesn't wobble much.

Picture Quality
9.0
Picture Quality
Contrast
Native Contrast
5,078 : 1
Contrast with local dimming
14,345 : 1

Update 10/21/2020: We've retested the contrast ratio with local dimming after updating the TV to the latest firmware (version 5.10.13.1-2). The recommended local dimming setting is now 'Medium', as it has the most effect on the contrast ratio, raising it to 14345:1.

The Vizio P Series Quantum X has an outstanding contrast ratio and can produce deep blacks for a fantastic dark room viewing experience. It has a full-array local dimming feature that improves the contrast; however, it seems to process our test pattern differently than in regular content. In real scenes, blacks appear darker, and whites are brighter. Using a full white and full black screen to measure the contrast with local dimming enabled, we obtained a contrast ratio of 21660:1. Note that the contrast ratio can vary between individual units.

8.9
Picture Quality
SDR Brightness
Real Scene Peak Brightness
672 cd/m²
Peak 2% Window
1,413 cd/m²
Peak 10% Window
1,924 cd/m²
Peak 25% Window
1,207 cd/m²
Peak 50% Window
939 cd/m²
Peak 100% Window
585 cd/m²
Sustained 2% Window
776 cd/m²
Sustained 10% Window
1,832 cd/m²
Sustained 25% Window
1,197 cd/m²
Sustained 50% Window
937 cd/m²
Sustained 100% Window
583 cd/m²
Automatic Brightness Limiting (ABL)
0.064

Update 10/21/2020: We've retested the SDR peak brightness after updating to the newest firmware (version 5.10.13.1-2) using a new calibration. However, while this new calibration addressed the red tint issue, it causes the appearance of faint yellow-green lines when displaying shades of white or blue, as well as causing a drop of about 100 cd/m² in brightness. As such, we're posting the results from the initial calibration.

The Vizio P Series Quantum X 2021 has excellent SDR peak brightness. It's more than enough to overcome glare, so you shouldn't have any visibility issues in well-lit environments. However, the brightness varies a lot across different content, and generally gets dimmer as large, bright areas cover the screen.

We measured the SDR peak brightness after calibration, using the 'Calibrated Dark' Picture Mode, with Backlight at max, Active Full-Array set to 'High', Gamma set to 2.2, and Color Temperature set to 'Warm'.

If you don't mind losing image accuracy, you can get a brighter picture using the 'Vivid' Picture Mode, with Backlight at max, Active Full-Array set to 'High', Gamma set to 2.2, and Color Temperature set to 'Cool'. We achieved a peak brightness of 2309 cd/m² in the 10% window using these settings.

8.0
Picture Quality
Local Dimming
Local Dimming
Yes
Backlight
Full-Array

Update 07/26/2021: We've added two new videos demonstrating the local dimming feature with real content.

Update 10/21/2020: We've updated the TV's firmware to version 5.10.13.1-2. The recommended setting for local dimming is now 'Medium', as it causes less blooming, and the lighting is applied more evenly, so it doesn't look as blotchy. Zone transition is faster and looks good. The only thing that hasn't changed much is how it handles subtitles; there's still a lot of blooming around them.

The Vizio P75QX-H1 has a great full-array local dimming feature. We recommend using the 'Medium' setting (local dimming is called Active Full-Array). There's some blooming around bright objects due to the TV's high brightness, but it isn't as noticeable in regular content, as the algorithm does a pretty good job of balancing bright and dark areas. Unfortunately, subtitles are bright, and there's a lot of blooming around them. Zone transitions are fast and aren't really visible.

The 65" model has fewer lighting zones while the 85" model has more. We expect them to perform differently.

8.0
Picture Quality
Local Dimming In Game Mode
Local Dimming
Yes
Backlight
Full-Array

Update 07/26/2021: We've added two new videos demonstrating the local dimming feature with real content.

8.8
Picture Quality
HDR Brightness
Real Scene Highlight
1,017 cd/m²
Peak 2% Window
1,243 cd/m²
Peak 10% Window
2,012 cd/m²
Peak 25% Window
1,256 cd/m²
Peak 50% Window
1,011 cd/m²
Peak 100% Window
606 cd/m²
Sustained 2% Window
694 cd/m²
Sustained 10% Window
1,895 cd/m²
Sustained 25% Window
1,244 cd/m²
Sustained 50% Window
1,008 cd/m²
Sustained 100% Window
604 cd/m²
Automatic Brightness Limiting (ABL)
0.060

Update 10/21/2020: We've retested the HDR peak brightness with the latest firmware update (version 5.10.13.1-2), with local dimming set to 'Medium'. There's a slight drop in brightness overall, but for the most part, it shouldn't be noticeable. The biggest change is the real scene peak brightness, which dropped from 1236 cd/m² to 1039 cd/m².

The Vizio P75QX-H1 has excellent HDR peak brightness, enough to deliver an excellent HDR experience. However, just like in SDR, the brightness varies a lot depending on the scene.

We measured the HDR peak brightness before calibration, using the 'Calibrated Dark' Picture Mode, with Active Full-Array set to 'High', Gamma set to '2.2', and Color Temperature set to 'Warm'.

If you want a brighter image in HDR, set the Picture Mode to 'Vivid', with Active Full-Array set to 'High', and Color Temperature set to 'Cool'. We achieved a peak brightness of 2456 cd/m² in the 10% window using these settings.

8.9
Picture Quality
HDR Brightness In Game Mode
Real Scene Highlight
1,031 cd/m²
Peak 2% Window
1,244 cd/m²
Peak 10% Window
2,019 cd/m²
Peak 25% Window
1,259 cd/m²
Peak 50% Window
1,012 cd/m²
Peak 100% Window
607 cd/m²
Sustained 2% Window
695 cd/m²
Sustained 10% Window
1,899 cd/m²
Sustained 25% Window
1,246 cd/m²
Sustained 50% Window
1,010 cd/m²
Sustained 100% Window
605 cd/m²
Automatic Brightness Limiting (ABL)
0.060
8.0
Picture Quality
Gray Uniformity
50% Std. Dev.
2.296%
50% DSE
0.152%
5% Std. Dev.
1.107%
5% DSE
0.109%

Gray uniformity on our unit of the Vizio PQX is great. There's a bit of darkening around the corners and some dirty screen effect; however, they're fairly minor and shouldn't be visible in regular content. Uniformity in dark scenes is a little better, but not by much. Aside from the mentioned reddish tint, there's also a light gray line in the center-right of the screen that isn't as noticeable in the picture as it is in person. This is likely an issue with the panel's uniformity, though we can't be certain. Gray uniformity can vary between individual units.

9.6
Picture Quality
Black Uniformity
Native Std. Dev.
0.474%
Std. Dev. w/ L.D.
0.546%

Update 10/21/2020: We replaced the black uniformity photo with local dimming. It now shows the screen with local dimming set to 'Medium', which is the current recommended setting.

Our unit of the Vizio P75QX-H1 has exceptional black uniformity. When local dimming is disabled, there's some clouding on the left side of the screen. When local dimming is enabled, the clouding is no longer visible, but there's blooming around the test cross. Note that black uniformity can vary between units. If you want a Vizio with perfect black uniformity, check out the Vizio OLED 2020.

5.0
Picture Quality
Viewing Angle
Color Washout
25°
Color Shift
20°
Brightness Loss
34°
Black Level Raise
21°
Gamma Shift

As is expected of most VA panels, this TV has poor viewing angles. As a result, images look inaccurate from the sides, making it less ideal for wide seating arrangements. The Enhanced Viewing Angle feature doesn't help much and causes colors to shift slightly. If you want a TV with wider viewing angles, check out the Samsung QN85A QLED.

8.9
Picture Quality
Reflections
Screen Finish
Semi-gloss
Total Reflections
2.3%
Indirect Reflections
0.2%
Calculated Direct Reflections
2.1%

The Vizio P Series Quantum X 2021 has excellent reflection handling. Combined with the TV's high brightness, you shouldn't have any visibility issues, even in the brightest environments.

6.3
Picture Quality
Pre Calibration
White Balance dE
4.46
Color dE
3.56
Gamma
2.08
Color Temperature
5,973 K
Picture Mode
Calibrated Dark
Color Temp Setting
Warm
Gamma Setting
2.2

Update 10/21/2020: We've retested the accuracy with the latest firmware version 5.10.13.1-2. There are some minor differences, but they aren't really noticeable.

Before calibration, the Vizio PQX 2021's color accuracy is mediocre. Most colors are noticeably inaccurate, and white balance is off. The color temperature is on the warm side, which adds to the already reddish tint mentioned. Gamma doesn't follow the target at all, making all scenes appear brighter than they should be. Note that color accuracy can vary between units.

9.1
Picture Quality
Post Calibration
White Balance dE
0.46
Color dE
1.95
Gamma
2.21
Color Temperature
6,469 K
White Balance Calibration
20 point
Color Calibration
Yes

Update 10/21/2020: We attempted a new calibration after updating to the latest firmware (version 5.10.13.1-2) to address the red tint issue. However, while this new calibration removed all of the red tint, it causes the appearance of faint yellow-green lines when displaying shades of white or blue. As such, we're sticking with the initial calibration. We also investigated the red tint issue separately using a spectroradiometer and discovered that the backlight itself has an above-normal red wavelength; you can see the recorded backlight spectrum here.

After calibration, the Vizio P Series Quantum X 2021's color accuracy is outstanding. There are still inaccuracies with most colors, but they're much harder to spot with the naked eye. White balance and gamma are almost perfect, and the color temperature is much closer to our 6500K target. As previously mentioned, our unit has a reddish tint. It isn't caused by the calibration process and doesn't show in our measurements.

You can see our recommended setting here.

7.0
Picture Quality
480p Input

Upscaling of 480p content looks decent, but it isn't as good as other recent 4k TVs.

7.0
Picture Quality
720p Input

The Vizio P Series Quantum X 2021 upscales 720p content, such as from cable boxes, well.

9.0
Picture Quality
1080p Input

1080p content is upscaled well, and there are no visible artifacts.

10
Picture Quality
4k Input

The Vizio P75QX-H1 displays 4k content perfectly. However, spatial dithering is present when using the Enhanced Viewing Angle feature, such as in the shadowy parts of this picture.

0
Picture Quality
8k Input

The Vizio P Series Quantum X 2020 can't display an 8k signal.

Picture Quality
Pixels

The Vizio P Series Quantum X 2021 uses a BGR sub-pixel structure that can affect text clarity when using the TV as a PC monitor. You can read more about it here. As mentioned, there's spatial dithering when using the Enhanced Viewing Angle feature; you can see the pixels here.

8.8
Picture Quality
Color Gamut
Wide Color Gamut
Yes
DCI P3 xy
94.05%
DCI P3 uv
95.13%
Rec 2020 xy
78.12%
Rec 2020 uv
83.35%

Update 10/32/2020: We've retested the color gamut with the latest firmware version 5.10.13.1-2. The results have changed slightly, but shouldn't be noticeable for most people. The score has been adjusted accordingly.

The Vizio P75QX-H1 has an excellent HDR color gamut. It covers the widely-used DCI P3 color space almost entirely and has great coverage of the wider Rec. 2020. The EOTF doesn't follow the PQ curve all that well, making most bright scenes too bright and dark scenes too dark. The 'Game' mode EOTF is very similar, as you can see here.

If you find HDR content too dim, you can make it brighter by setting the Picture Mode to 'Calibrated Dark HDR', Active Full-Array to 'High', Gamma to '1.8', and Local Contrast to 'Medium'. These settings result in a much brighter image, as you can see in this EOTF.

7.7
Picture Quality
Color Volume
Normalized DCI P3 Coverage ITP
82.7%
10,000 cd/m² DCI P3 Coverage ITP
53.7%
Normalized Rec 2020 Coverage ITP
71.7%
10,000 cd/m² Rec 2020 Coverage ITP
45.2%

Update 10/32/2020: We've retested the color volume with the latest firmware version 5.10.13.1-2. The results have changed slightly and the score has been adjusted accordingly.

Good color volume. It can display dark and saturated colors very well due to its high contrast ratio. It has trouble with bright blues, which is typical for LCDs.

8.5
Picture Quality
Gradient
Color Depth
10 Bit
Red (Std. Dev.)
0.099
Green (Std. Dev.)
0.095
Blue (Std. Dev.)
0.080
Gray (Std. Dev.)
0.108

The Vizio P Series Quantum X 2020 has excellent gradient handling. There's only a tiny amount of banding in the darker shades and the grays. Unfortunately, turning on Noise Reduction doesn't make it any better.

10
Picture Quality
Temporary Image Retention
IR after 0 min recovery
0.00%
IR after 2 min recovery
0.00%
IR after 4 min recovery
0.00%
IR after 6 min recovery
0.00%
IR after 8 min recovery
0.00%
IR after 10 min recovery
0.00%

The Vizio P Series Quantum X doesn't show any signs of temporary image retention; however, it can vary between units.

10
Picture Quality
Permanent Burn-In Risk
Permanent Burn-In Risk
No

We don't expect VA panels to experience permanent image retention, as the VA panel in our long-term test appears immune.

Motion
8.0
Motion
Response Time
80% Response Time
3.8 ms
100% Response Time
14.4 ms

The Vizio P Series Quantum X has a great response time, delivering clear motion with only a short blur trail behind fast-moving objects. However, there's a significant amount of overshoot in the darker transitions that result in some motion artifacts in dark scenes. If response time is important to you, then check out the Samsung QN90A QLED.

4.0
Motion
Flicker-Free
Flicker-Free
No
PWM Dimming Frequency
120 Hz

The backlight is flicker-free when the brightness set to max, which helps reduce motion duplication. However, it always flickers at 120Hz when the brightness is set to 99 or lower.

10
Motion
Black Frame Insertion (BFI)
Optional BFI
Yes
Min Flicker For 60 fps
60 Hz
60Hz For 60 fps
Yes
120Hz For 120 fps
Yes
Min Flicker for 60 fps in Game Mode
60 Hz

The Vizio P75QX-H1 has an optional Black Frame Insertion feature that can help improve motion clarity. To get a 60Hz flicker for 60fps content, enable Clear Action. To achieve a 120Hz flicker for 120fps content, leave Clear Action off, but set the TV's Brightness to 99 or lower.

Motion
Motion Interpolation
Motion Interpolation (30 fps)
Yes
Motion Interpolation (60 fps)
Yes

The Vizio P Series Quantum X can interpolate lower frame rate content up to 120fps to make motion look more fluid. It works well in quiet scenes, but unfortunately, it doesn't look good in busy scenes, as there are motion artifacts like halos around fast-moving objects. To interpolate native 30fps content, increase Judder Reduction, and for 60fps content, increase Blur Reduction. These settings should be adjusted depending on the content that you're watching.

7.6
Motion
Stutter
Frame Hold Time @ 24 fps
27.3 ms
Frame Hold Time @ 60 fps
2.3 ms

Even though the Vizio P75QX-H1 has a fast response time, it doesn't stutter too much in 24fps content. If stutter bothers you, enabling motion interpolation can help.

7.8
Motion
24p Judder
Judder-Free 24p
Yes
Judder-Free 24p via 60p
No
Judder-Free 24p via 60i
No
Judder-Free 24p via Native Apps
Yes

The Vizio P Series Quantum X 2021 can remove judder from 24p sources and native apps, but not from 60i/60p sources. To remove judder, enable Film Mode.

8.2
Motion
Variable Refresh Rate
Native Refresh Rate
120 Hz
Variable Refresh Rate
Yes
HDMI Forum VRR
Unknown
FreeSync
Yes
G-SYNC Compatible
No
4k VRR Maximum
60 Hz
4k VRR Minimum
48 Hz
1080p VRR Maximum
120 Hz
1080p VRR Minimum
< 20 Hz
1440p VRR Maximum
N/A
1440p VRR Minimum
No VRR support
VRR Supported Connectors
HDMI

Update 10/23/2020: we've retested the VRR with an NVIDIA RTX 3080 and the latest firmware (version 5.10.13.1-2). It doesn't work at 1440p @ 60Hz because VRR isn't available when it's a forced resolution. 1440p @ 120Hz doesn't work because it's causing artifacts. 4k @ 60Hz works; however, the VRR range is much smaller, from 48Hz to 60Hz. 4k @ 120Hz doesn't work, as there's still a lot of tearing.

The Vizio P75QX-H1 supports variable refresh rate technology to reduce screen tearing when gaming. It's advertised to have HDMI Forum VRR support; however, we can only confirm that it works with FreeSync at this time. This is because the Xbox One that we use for testing supports both FreeSync and HDMI Forum VRR, and we don't have a reliable way to tell which one is active.

To turn on VRR, set Game Low Latency and Variable Refresh Rate to 'On'.

Inputs
9.4
Inputs
Input Lag
1080p @ 60Hz
14.1 ms
1080p @ 60Hz Outside Game Mode
109.5 ms
1440p @ 60Hz
14.1 ms
4k @ 60Hz
13.9 ms
4k @ 60Hz + 10-Bit HDR
13.8 ms
4k @ 60Hz @ 4:4:4
13.9 ms
4k @ 60Hz Outside Game Mode
109.2 ms
4k @ 60Hz With Interpolation
122.6 ms
8k @ 60Hz
N/A
1080p @ 120Hz
59.0 ms
1440p @ 120Hz
N/A
4k @ 120Hz
15.1 ms
1080p with Variable Refresh Rate
34.6 ms
1440p with VRR
N/A
4k with VRR
13.7 ms
8k with VRR
N/A

Update 10/23/2020: We've retested the input lag with an NVIDIA RTX 3080 and the latest firmware (version 5.10.13.1-2). The posted result for 4k @ 120Hz is an average of several runs, as we encountered the same issue as in 1080p and 1440p. It skips frames when Game Low Latency is enabled, and the results are inconsistent from one run to another. The input lag for 1080p @ 120Hz has been updated, and the result is also an average of several runs. All of the updated measurements are taken out of 'Game' mode since it doesn't skip frames and is more consistent. We can't measure 1440p @ 120Hz, as it's downscaled from 4k. The 1080p with VRR input lag is lower than 1080P @ 120Hz because VRR seems to lower the latency.

The Vizio P75QX-H1 has excellent low input lag as long as you have Game Low Latency enabled. Motion interpolation is usable when gaming, but it adds significant input lag and isn't recommended. There's an 'Auto Low Latency Mode' that automatically enables 'Game' mode when a game is launched from a compatible device. To use it, set Game Low Latency to 'Auto'. There's no longer a 'Computer' mode for PC use; you only need to set Game Low Latency to 'On'.

We encountered a few bugs while testing the input lag. Like the Vizio P Series Quantum 2020, the TV skips frames when displaying a 1080p or 1440p signal at 120Hz with Game Low Latency on. Also, we obtained inconsistent input lag results when running at 120Hz, as they vary enormously between each run. These are likely bugs that'll be fixed in a firmware update; we'll retest it when the update is available.

9.2
Inputs
Supported Resolutions
1080p @ 60Hz @ 4:4:4
Yes
1080p @ 120Hz
Yes (native support)
1440p @ 60Hz
Yes (forced resolution required)
1440p @ 120Hz
No
4k @ 60Hz
Yes
4k @ 60Hz @ 4:4:4
Yes
4k @ 120Hz
Yes (native support)
8k @ 30Hz or 24Hz
No
8k @ 60Hz
No

Update 07/26/2021: We retested 4k @ 120Hz with the latest firmware, and it's still skipping frames if Game Low Latency is enabled.

Update 10/23/2020: We retested 4k @ 120Hz with an NVIDIA RTX 3080 and the latest firmware (version 5.10.13.1-2). It can now display it, but there are still some issues. It skips frames when Game Low Latency is enabled, and it can't display proper chroma 4:4:4. We'll retest it once a new firmware update is available.

The Vizio P Series Quantum X 2021 supports most common resolutions at 60Hz and 120Hz. However, as mentioned in the input lag section, it skips frames when displaying a 120Hz signal with Game Low Latency enabled.

The TV can display proper chroma 4:4:4 at all supported resolutions except for 1440p and 4k @ 120Hz. That said, there's a bug with the way that it works right now. To send a chroma 4:4:4 signal, you need to set both the PC and the TV's Color Space Range setting to 'RGB'. This is because setting the PC to chroma 4:4:4 and the TV to Full Color 4:4:4 looks bad and makes text more blurry. We'll retest it once a firmware update is available.

For signals that require full bandwidth, the Full UHD Color setting has been removed, so there's nothing to change.

Inputs
Advanced Console Compatibility
Auto Low Latency Mode (ALLM)
Yes
PS5, 4k @ 120Hz + HDR
Yes
PS5, 4k @ 120Hz
Yes
PS5, 4k @ 60Hz + HDR
Yes
PS5, 1440p @ 120Hz
PS5 can't do 1440p
PS5, 1080p @ 120Hz
Yes
PS5, Variable Refresh Rate
PS5 can't do VRR yet
Xbox Series X, 4k @ 120Hz + HDR
Yes
Xbox Series X, 4k @ 120Hz
Yes
Xbox Series X, 4k @ 60Hz + HDR
Yes
Xbox Series X, 1440p @ 120Hz
No
Xbox Series X, 1080p @ 120Hz
Yes
Xbox Series X, Variable Refresh Rate
Yes

Update 07/26/2021: We retested the TV with the latest firmware. 4k @ 120Hz is now displayed properly from a PS5, in HDR and SDR, but it still skips frames if Game Low Latency is enabled.

Inputs
Inputs Specifications
HDR10
Yes
HDR10+
Yes
Dolby Vision
Yes
HLG
Yes
HDMI 2.0 Full Bandwidth
Yes (HDMI 1,2,3,4)
HDMI 2.1 Class Bandwidth
Yes (HDMI 3,4)
CEC Yes
HDCP 2.2 Yes (HDMI 1,2,3,4)
USB 3.0
No
Variable Analog Audio Out Yes
Wi-Fi Support Yes (2.4 GHz, 5 GHz)

Update 10/23/2020: We've retested the inputs using an NVIDIA RTX 3080 and the latest firmware (version 5.10.13.1-2). Although they're all advertised as having HDMI 2.1 support, only HDMI 3 and 4 can display a 4k @ 120Hz signal.

Inputs
Input Photos
Inputs
Total Inputs
HDMI 4
USB 1
Digital Optical Audio Out 1
Analog Audio Out 3.5mm 0
Analog Audio Out RCA 1
Component In 0
Composite In 1
Tuner (Cable/Ant) 1
Ethernet 1
DisplayPort 0
IR In 0
SD/SDHC 0
Inputs
Audio Passthrough
ARC
Yes (HDMI 1)
eARC support
Yes
Dolby Atmos via TrueHD via eARC
Yes
DTS:X via DTS-HD MA via eARC
Yes
5.1 Dolby Digital via ARC
Yes
5.1 DTS via ARC
Yes
5.1 Dolby Digital via Optical
Yes
5.1 DTS via Optical
Yes

The Vizio P Series Quantum X 2021 supports eARC, allowing it to pass high-quality audio like Dolby Atmos via TrueHD over an HDMI connection. To use it, set eARC to 'On', and Digital Audio Out to 'Auto'.

Sound Quality
6.5
Sound Quality
Frequency Response
Low-Frequency Extension
113.14 Hz
Std. Dev. @ 70
4.27 dB
Std. Dev. @ 80
4.21 dB
Std. Dev. @ Max
6.10 dB
Max
91.5 dB SPL
Dynamic Range Compression
3.88 dB

The Vizio P Series Quantum X 2020's frequency response is okay. It's relatively well-balanced to deliver clear dialogue, but it lacks bass. It gets very loud, and there isn't much compression when playing at max volume.

7.2
Sound Quality
Distortion
Weighted THD @ 80
0.093
Weighted THD @ Max
0.552
IMD @ 80
2.19%
IMD @ Max
5.39%

Decent distortion performance. It sounds clean at moderate volume levels, and even though there's more distortion at max volume, it shouldn't be noticeable to most people.

Smart Features
7.0
Smart Features
Interface
Smart OS SmartCast
Version 1.60
Ease of Use
Easy
Smoothness
Average
Time Taken to Select YouTube
10 s
Time Taken to Change Backlight
3 s
Advanced Options
Many

Vizio's SmartCast is decent. It's user-friendly and runs okay for the most part. Unfortunately, on top of the bugs mentioned in the input lag and supported resolution sections, it also crashes randomly while on the home screen.

10
Smart Features
Ad-Free
Ads
No
Opt-out
No Ads
Suggested Content in Home
Yes
Opt-out of Suggested Content
No

There aren't any ads on the home screen, but there's suggested content, mostly to promote Vizio's WatchFree feature.

6.5
Smart Features
Apps and Features
App Selection
Great
App Smoothness
Average
Cast Capable
Yes
USB Drive Playback
Yes
USB Drive HDR Playback
Yes
HDR in Netflix
Yes
HDR in YouTube
Yes

Vizio's SmartCast platform has a reasonable number of apps, and they come pre-installed. However, you can't add more since there's no app store.

6.0
Smart Features
Remote
Size
Medium
Voice Control
No
CEC Menu Control
Yes
Other Smart Features
No
Remote App Vizio SmartCast Mobile

The remote control is similar to the Vizio P Series Quantum X 2019's, but with some small changes. The navigation pad is now circular, and there's an added button for Vizio's WatchFree feature. However, it doesn't have a mic for voice control like the remote on the Vizio P Series Quantum 2021.

Smart Features
TV Controls

The controls are located on the right backside of the TV. They allow you to turn the TV On/Off, change the input source, and adjust the volume.

Smart Features
In The Box

  • Power cord
  • Remote control
  • User guide
  • 2x AAA batteries

Smart Features
Misc
Power Consumption 87 W
Power Consumption (Max) 311 W
Firmware 5.10.8.1-1

Differences Between Sizes And Variants

We tested the 75" Vizio P Series Quantum X 2021 (P75QX-H1), and for the most part, we expect our results to be valid for the 65" (P65QX-H1) and the 85" (P85QX-H1) models as well. Note that the 85" model isn't available yet and is expected for release this fall. The three sizes have different numbers of local dimming zones, and as such, we expect the local dimming to perform differently on the 65" and the 85" models.

Size Model Dimming Zones
65" P65QX-H1 384
75" P75QX-H1 480
85" P85QX-H1 792

If someone comes across a different type of panel or their Vizio P Series Quantum X 2021 doesn't correspond to our review, let us know and we'll update the review. Note that some tests, such as gray uniformity, may vary between individual units.

You can see our unit's label here.

Compared To Other TVs

The Vizio P Series Quantum X 2021 is an overall great TV that's suitable for most uses. Its biggest weakness is its VA panel's poor viewing angles, making it less ideal for large rooms with wide seating areas. For a similar TV with better viewing angles, check out the Sony X950H. You can also see our recommendations for the best TVs, the best 4k TVs, and the best budget TVs.

Hisense U8G
55" 65"

The Hisense U8G is slightly better overall than the Vizio P Series Quantum X 2020, but the differences are minor. Unlike the Hisense, the Vizio can't remove judder from 60Hz sources, which might be important if you like to watch movies from a cable box, for example. On the other hand, the Vizio has a much higher contrast ratio with local dimming, and it's significantly brighter with some content.

Samsung QN90A QLED
43" 50" 55" 65" 75" 85"

The Samsung QN90A QLED is a bit better overall than the Vizio P Series Quantum X 2020. The Samsung gets a bit brighter, and it has wider viewing angles thanks to its 'Ultra Viewing Angle' technology. The Samsung also has better gaming performance because there aren't any bugs with its VRR, it supports the PS5 with 4k @ 120Hz games, and it has a quicker response time. However, the Vizio has a better contrast ratio because it doesn't have any viewing angle technology.

Vizio P Series Quantum 2021
65" 75"

The Vizio P Series Quantum X 2020 and the Vizio P Series Quantum 2021 are both great 4k TVs. They have similar features and each use VA panels with a high contrast ratio, but local dimming is better on the Quantum X because it displays deeper blacks and has better uniformity. The Quantum X also gets brighter in HDR, so highlights pop more. Motion looks smoother on the Quantum X due to the quicker response time. The Quantum comes with the new Vizio remote, which has voice control, and the Quantum X doesn't have that.

Sony X950H
49" 55" 65" 75" 85"

The Vizio P Series Quantum X 2020 and the Sony X950H are very similar overall. The Vizio has a higher contrast ratio, a better HDR color gamut, and much lower input lag. The Sony has wider viewing angles due to its 'X-Wide Angle' layer, faster response time, and its internal speakers sound much better.

Sony X900H
55" 65" 75" 85"

Overall, the Vizio P Series Quantum X 2020 is a bit better than the Sony X900H. The Vizio has a higher contrast ratio, gets brighter in both SDR and HDR, and has significantly better reflection handling. However, the Sony has better color accuracy out-of-the-box, a faster response time, and its Android TV platform runs smoother and has more apps available.

Samsung Q80/Q80T QLED
49" 50" 55" 65" 75" 85"

Overall, the Samsung Q80/Q80T QLED is a bit better than the Vizio P Series Quantum X 2020 for most uses. The Samsung has better reflection handling and wider viewing angles, so it's better for wider seating arrangements. It also has a faster response time and a lower input lag, so it's a better choice if you play video games. However, the Vizio has a higher contrast ratio, a much better HDR color gamut, and it gets a lot brighter in both SDR and HDR.

Vizio P Series Quantum 2020
65" 75"

The Vizio P Series Quantum X 2020 is better than the Vizio P Series Quantum 2020. The X 2020 has better local dimming, slightly better reflection handling, and gets much brighter. The P Series Quantum 2020 has faster response time, though, and it also has better color accuracy out-of-the-box.

LG CX OLED
48" 55" 65" 77"

The LG CX OLED is much better than the Vizio P Series Quantum X 2020. The LG is an OLED and can produce perfect blacks, which the Vizio can't. The LG also has better reflection handling, faster response time, and better color accuracy out-of-the-box. The Vizio can get much brighter, though, making it a better choice for very bright rooms. Also, there's less stutter in lower frame rate content on the Vizio due to its slower response time.

Vizio OLED 2020
55" 65"

The Vizio OLED 2020 is somewhat better than the Vizio P Series Quantum X 2020, but they have different panel types. The OLED  displays perfect blacks and has much wider viewing angles. It also has better reflection handling, it upscales lower-resolution content well, and has a much quicker response time. However, the Quantum X gets significantly brighter, displays a wider color gamut, has lower input lag, and doesn't have the risk of permanent burn-in.

Vizio P Series Quantum X 2019
65" 75"

The Vizio P Series Quantum X 2020 is marginally better than the Vizio P Series Quantum X 2019. The 2020 model has better gray and black uniformity, and its input lag is significantly lower. On the other hand, the 2019 model has a higher contrast ratio, better local dimming, and faster response time.

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