Vizio M8 Series Quantum 2020 TV Review

Tested using Methodology v1.6
Updated Nov 02, 2020 at 08:35 am
Vizio M8 Series Quantum 2020 Picture
7.7
Mixed Usage
Value for price beaten by
: no price info
8.0
Movies
Value for price beaten by
: no price info
7.4
TV Shows
Value for price beaten by
: no price info
7.2
Sports
Value for price beaten by
: no price info
7.9
Video Games
Value for price beaten by
: no price info
7.9
HDR Movies
Value for price beaten by
: no price info
7.9
HDR Gaming
Value for price beaten by
: no price info
7.8
PC Monitor
Value for price beaten by
: no price info
Type LED
Sub-Type
VA
Resolution 4k

The Vizio M8 Series Quantum 2020 is a good mid-range 4k TV. Like its predecessor, the Vizio M Series Quantum 2019, it sports a VA panel that can produce deep blacks for a great dark room viewing experience. It has an excellent HDR color gamut, allowing it to display rich and saturated colors in HDR content. Its response time is decent, input lag is low, and it supports variable refresh rate technology to reduce screen tearing when gaming. It handles reflections decently well and gets bright enough to overcome glare, but not quite bright enough to make highlights stand out in HDR content. Its VA panel's viewing angles are quite narrow, so it isn't the best option for large seating areas, as the image looks inaccurate when viewed from the side. Lastly, while it has a full-array local dimming feature, its sub-par implementation results in a lot of blooming around bright objects.

At the time of writing, this TV is difficult to find through most major retailers. We'll provide links once they're available. Our unit was purchased from Walmart.

Our Verdict

7.7 Mixed Usage

The Vizio M Series Quantum 2020 is a good TV overall. Like most VA panel TVs, it delivers deep blacks, making it a great choice to watch movies or play video games in the dark. It has a decent response time and low input lag, and it can display proper chroma 4:4:4 when using it as a PC monitor. It overcomes glare easily in a well-lit environment but doesn't get bright enough to deliver a satisfying HDR experience. Also, its poor viewing angles make it less suitable for large rooms or wide seating areas.

Pros
  • High contrast ratio.
  • Decent response time.
  • Gets bright enough to fight glare.
Cons
  • Poor viewing angles.
  • Dirty screen effect.
8.0 Movies

The Vizio M Series Quantum is great for watching movies. Its high contrast ratio allows it to produce deep blacks, great for watching movies in the dark. It upscales 1080p content well and can remove judder from low frame rate content. It has a full-array local dimming feature; however, it doesn't perform well, as it causes a lot of blooming around bright objects.

Pros
  • High contrast ratio.
  • Decent black uniformity.
  • Doesn't stutter much in low frame rate content.
Cons
  • Sub-par local dimming.
  • Dirty screen effect.
7.4 TV Shows

The Vizio M Series Quantum is decent for watching TV shows. It provides good visibility in well-lit environments, as it gets bright enough to fight glare and has decent reflection handling. Its VA panel has poor viewing angles, so it isn't ideal if you like walking around while watching TV. Vizio's SmartCast platform is easy to use, but its app selection is limited because there's no app store. You can safely leave it on the same channel or programming all day since its VA panel is immune to permanent burn-in.

Pros
  • Decent reflection handling.
  • Gets bright enough to fight glare.
Cons
  • Poor viewing angles.
  • Dirty screen effect.
7.2 Sports

The Vizio M Series Quantum is decent for watching sports. It has a decent response time and a Black Frame Insertion feature to deliver fast-moving scenes with minimal motion blur. It handles reflections decently well and gets bright enough to overcome glare. Unfortunately, its VA panel's narrow viewing angles might be an issue, especially if you like watching with a big group of people. There's a fair amount of dirty screen effect on our unit; however, this can vary between individual units.

Pros
  • Decent response time.
  • Decent reflection handling.
  • Gets bright enough to fight glare.
Cons
  • Poor viewing angles.
  • Dirty screen effect.
7.9 Video Games

The Vizio M Series Quantum is great for gaming. Its decent response time results in only a short blur trail behind fast-moving objects, and it has an optional Black Frame Insertion feature to improve motion clarity. It has incredibly low input lag, providing a responsive gaming experience. It's well-suited for dark room gaming, as it has a high contrast ratio and exceptional black uniformity. The refresh rate is limited to 60Hz, but on the bright side, it supports variable refresh rate technology to reduce screen tearing.

Pros
  • Low input lag.
  • Decent response time.
  • Variable refresh rate.
Cons
  • Dirty screen effect.
7.9 HDR Movies

The Vizio M Series Quantum is good for watching movies in HDR. It has a high contrast ratio and exceptional black uniformity, making it an excellent choice for dark rooms. It can produce rich and vibrant colors due to its excellent color gamut, but it doesn't get bright enough to make highlights stand out in HDR content. Also, the local dimming causes a lot of blooming around bright objects and can be distracting.

Pros
  • High contrast ratio.
  • Excellent HDR color gamut.
  • Decent black uniformity.
  • Doesn't stutter much in low frame rate content.
Cons
  • Mediocre HDR peak brightness.
  • Sub-par local dimming.
  • Dirty screen effect.
7.9 HDR Gaming

The Vizio M Series Quantum is great for gaming in HDR. It has a decent response time and low input lag, and it supports variable refresh rate technology to minimize screen tearing. It performs remarkably well in dark rooms thanks to its high contrast ratio and exceptional black uniformity. Its excellent color gamut allows it to produce a wide range of colors in HDR content, but sadly, it doesn't get bright enough to make highlights pop.

Pros
  • High contrast ratio.
  • Low input lag.
  • Decent response time.
  • Excellent HDR color gamut.
  • Variable refresh rate.
Cons
  • Mediocre HDR peak brightness.
  • Sub-par local dimming.
  • Dirty screen effect.
7.8 PC Monitor

The Vizio M Series Quantum is a good TV for use as a PC monitor. It has low input lag and a decent response time to make the desktop experience feel smooth and responsive. It supports most common resolutions and can display chroma 4:4:4 for optimal text clarity. Unfortunately, it has poor viewing angles, so the edges of the screen can look washed out if you sit too close. On the upside, you don't have to worry about permanent burn-in, as its VA panel is immune to it.

Pros
  • Low input lag.
  • Decent response time.
  • Decent reflection handling.
Cons
  • Poor viewing angles.
  • Dirty screen effect.
  • 7.7 Mixed Usage
  • 8.0 Movies
  • 7.4 TV Shows
  • 7.2 Sports
  • 7.9 Video Games
  • 7.9 HDR Movies
  • 7.9 HDR Gaming
  • 7.8 PC Monitor
  1. Updated Aug 02, 2021: Added the real content local dimming videos.
  2. Updated Mar 01, 2021: Converted to Test Bench 1.6.
  3. Updated Jan 13, 2021: We've retested the local dimming to check on the flashing issue in Dolby Vision content.
  4. Updated Dec 22, 2020: We've retested the supported resolutions and inputs with the latest firmware (version 1.10.15.1-2).
  5. Updated Dec 16, 2020: We've retested the local dimming with the latest firmware version 1.10.15.1-2.
  6. Updated Nov 02, 2020: Updated review for accuracy and clarity.
  7. Updated Oct 26, 2020: We've reuploaded some of the photos in the review and retested the input lag, supported resolutions, and VRR with the latest firmware (version 5.10.13.1-2).

Video

Test Results

perceptual testing image
Market Context
Market Context
Market Context

The Vizio M8 Series Quantum 2020 is a mid-range TV, and it replaces the Vizio M Series Quantum 2019. Just like in 2019, there's also an M7 variant. It competes with the Samsung TU8000, the Hisense H8G, and the Sony X800H.

Design
Design
Style
Curved No

The Vizio M Series Quantum 2020 has an excellent design. It's nearly, if not entirely, identical to the Vizio M Series Quantum 2019. It's simple and minimalist, with thin borders on all sides and wide-set feet.

Design
Stand

The feet are set almost as wide as the TV itself, so it requires a large surface to put it on if you don't plan on wall-mounting it. They support the TV well, and there's very little wobble.

Footprint of the 65" stand: 50.4" x 11.7"

Design
Back
Wall Mount VESA 400x200

The top portion of the back is metal, while the bottom portion is made out of plastic. Some of the inputs are bottom-facing, but they're easy to access even when the TV is wall-mounted. Unfortunately, there's no cable management.

Design
Borders
Borders 0.47" (1.2 cm)

The Vizio MQ8's borders are thin and aren't distracting.

Design
Thickness
Max Thickness 2.91" (7.4 cm)

The bottom portion of the TV is thicker than the top, but it's still relatively thin and doesn't stick out much when wall-mounted.

7.0
Design
Build Quality

The Vizio M Series Quantum's build quality is decent. It's a mix of metal and plastic, and it feels very sturdy. There's only a little bit of flex around the inputs. The stand supports the TV well, and it doesn't wobble much.

Picture Quality
8.9
Picture Quality
Contrast
Native Contrast
5,066 : 1
Contrast with local dimming
8,117 : 1

The Vizio M Series Quantum has an excellent contrast ratio, and it gets a lot better with local dimming enabled. Blacks look deep and inky, which is great for watching in a dark environment. Note that the contrast ratio can vary between units.

7.7
Picture Quality
SDR Brightness
Real Scene Peak Brightness
366 cd/m²
Peak 2% Window
504 cd/m²
Peak 10% Window
581 cd/m²
Peak 25% Window
528 cd/m²
Peak 50% Window
412 cd/m²
Peak 100% Window
366 cd/m²
Sustained 2% Window
492 cd/m²
Sustained 10% Window
573 cd/m²
Sustained 25% Window
526 cd/m²
Sustained 50% Window
412 cd/m²
Sustained 100% Window
366 cd/m²
Automatic Brightness Limiting (ABL)
0.026

The Vizio M Series Quantum 2021 has good SDR peak brightness. It varies a lot depending on the scene, but overall, it's enough to overcome glare in bright lighting conditions.

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

If you don't mind a slightly less accurate image, you can achieve a higher peak brightness by setting the Picture Mode to 'Vivid, Active Full-Array to 'High', and Color Temperature to 'Cool'. We achieved a peak brightness of 648 cd/m² in the 10% window using these settings.

5.5
Picture Quality
Local Dimming
Local Dimming
Yes
Backlight
Full-Array

Update 08/02/2021: Added the real content local dimming videos.

Update 01/13/2021: We've retested the local dimming, specifically the flashing issue in Dolby Vision content. It seems like there's some improvement as the flashing isn't as noticeable, but it's still present. We also encountered a bug that causes red and green flashes in the opening scene of 'Our Planet'.

Update 12/22/2020: We've retested the local dimming with the latest firmware version 1.10.15.1-2. Not much has changed except that we now recommend using the 'Medium' setting instead of 'High'. The 'Medium' setting isn't as aggressive as the 'High' and causes less blooming.

The Vizio M Series Quantum has a sub-par local dimming feature. There are a few issues with its implementation, as well as some bugs that need fixing through a firmware update. The recommended setting is 'Medium' (local dimming is called Active Full-Array in the settings menu) and is the setting we used for testing.

The most glaring issue with the local dimming is the amount of blooming. There's a lot of it, and like the Vizio P Series Quantum 2020, it's inconsistent between different areas of the screen, which makes the screen look blotchy and accentuates uniformity issues. In dark scenes with small highlights, like a starfield, it has a hard time deciding which stars should stand out, so while some stars look bright with blooming around, others look dim. Subtitles aren't handled well, and there's a lot of blooming around them.

It doesn't crush blacks, although it's mostly due to the higher overall black level and the amount of blooming present. Zone transitions are very slow, and the lighting zones are visible when bright objects move across the screen.

We encountered a few bugs with the local dimming. The first is that the TV indicates that the local dimming is on even when it's off. Turning the local dimming off and back on again usually resolves this issue. The second bug is that the local dimming shuts off when viewing Dolby Vision content. Unfortunately, there's no workaround for this, and it requires a firmware update. We'll retest it once it's available. The third bug is that when the TV is in 'Dolby Vision Bright' Picture Mode and local dimming is set to 'Medium', the screen flickers when it displays a bright, static image, even though the local dimming is disabled due to the mentioned bug.

5.5
Picture Quality
Local Dimming In Game Mode
Local Dimming
Yes
Backlight
Full-Array

Update 08/02/2021: Added the real content local dimming videos.

6.5
Picture Quality
HDR Brightness
Real Scene Highlight
483 cd/m²
Peak 2% Window
336 cd/m²
Peak 10% Window
511 cd/m²
Peak 25% Window
569 cd/m²
Peak 50% Window
500 cd/m²
Peak 100% Window
378 cd/m²
Sustained 2% Window
333 cd/m²
Sustained 10% Window
505 cd/m²
Sustained 25% Window
565 cd/m²
Sustained 50% Window
498 cd/m²
Sustained 100% Window
376 cd/m²
Automatic Brightness Limiting (ABL)
0.032

The Vizio M Series Quantum's HDR peak brightness is mediocre. It's an improvement over the Vizio M Series Quantum 2019, but it still isn't enough to make highlights pop in HDR content. Just like in SDR, the brightness varies a lot across different content.

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

If you want an even brighter picture and don't mind losing image accuracy, set the Picture Mode to 'Vivid', Active Full-Array to 'High', Color Temperature to 'Cool', and Gamma to '1.8'. We achieved a peak brightness of 629 cd/m² in the 10% window using the settings.

6.6
Picture Quality
HDR Brightness In Game Mode
Real Scene Highlight
485 cd/m²
Peak 2% Window
334 cd/m²
Peak 10% Window
512 cd/m²
Peak 25% Window
570 cd/m²
Peak 50% Window
500 cd/m²
Peak 100% Window
378 cd/m²
Sustained 2% Window
332 cd/m²
Sustained 10% Window
506 cd/m²
Sustained 25% Window
565 cd/m²
Sustained 50% Window
499 cd/m²
Sustained 100% Window
377 cd/m²
Automatic Brightness Limiting (ABL)
0.032
6.7
Picture Quality
Gray Uniformity
50% Std. Dev.
2.329%
50% DSE
0.243%
5% Std. Dev.
0.947%
5% DSE
0.138%

Update 10/26/2020: We've reuploaded a new gray uniformity picture and updated the score from 6.5 to 6.7.

Gray uniformity on our unit of the Vizio M Series Quantum is okay. There's noticeable dirty screen effect in the center, and there are a few spots that appear darker than the rest of the screen, like the top corners. It's much better in dark scenes, but the dirty screen effect is still visible. Note that gray uniformity can vary between units.

9.3
Picture Quality
Black Uniformity
Native Std. Dev.
0.392%
Std. Dev. w/ L.D.
1.221%

Update 10/26/2020: We've reuploaded a new black uniformity picture and updated the score from 9.1 to 9.3.

Black uniformity on our Vizio M8 Series Quantum is exceptional. With local dimming disabled, the whole screen looks more grayish but otherwise very uniform. With local dimming enabled, black level is much better, but the blooming around the test cross is more visible. Note that black uniformity can vary between units.

5.2
Picture Quality
Viewing Angle
Color Washout
21°
Color Shift
20°
Brightness Loss
29°
Black Level Raise
18°
Gamma Shift
20°

Like most VA panel TVs, the Vizio M Series Quantum has poor viewing angles. This results in images looking washed out when viewed from the side and isn't ideal for wide seating areas.

7.4
Picture Quality
Reflections
Screen Finish
Semi-gloss
Total Reflections
5.2%
Indirect Reflections
0.6%
Calculated Direct Reflections
4.6%

The Vizio M Series Quantum has decent reflection handling. It handles ambient light well but struggles more with direct reflections, so it's best to avoid placing the TV opposite bright lights.

7.4
Picture Quality
Pre Calibration
White Balance dE
3.64
Color dE
2.45
Gamma
2.21
Color Temperature
5,999 K
Picture Mode
Calibrated Dark
Color Temp Setting
Warm
Gamma Setting
2.2

The Vizio M65Q8-H1's out-of-the-box color accuracy is decent. Most colors are only slightly inaccurate and are hard to spot. White balance is off, and the color temperature is much warmer than our 6500K target, resulting in a slight reddish tint. Gamma follows the target reasonably well, although most scenes are too dark and bright scenes are too bright. Note that color accuracy can vary between units.

9.6
Picture Quality
Post Calibration
White Balance dE
0.19
Color dE
0.77
Gamma
2.20
Color Temperature
6,488 K
White Balance Calibration
20 point
Color Calibration
Yes

After calibration, the Vizio M Series Quantum's color accuracy is exceptional. White balance and gamma are nearly perfect, and the color temperature is much closer to our 6500K target. The remaining color inaccuracies shouldn't be noticeable without the aid of a colorimeter.

You can see our recommended settings here.

7.0
Picture Quality
480p Input

480p content, such as from DVDs, looks decent on the Vizio M Series Quantum, but it isn't as good as most 4k TVs.

7.0
Picture Quality
720p Input

There aren't any obvious artifacts when upscaling 720p content, but it doesn't look as good as most 4k TVs.

9.0
Picture Quality
1080p Input

Upscaling of 1080p content, such as from Blu-rays, looks almost as good as 4k.

10
Picture Quality
4k Input

The Vizio M Series Quantum displays 4k content perfectly.

0
Picture Quality
8k Input

The Vizio M Series Quantum can't display an 8k signal.

Picture Quality
Pixels

The Vizio M Series Quantum uses a BGR sub-pixel structure. It doesn't affect picture quality but can affect text clarity when using the TV as a PC monitor. You can read more about it here.

8.8
Picture Quality
Color Gamut
Wide Color Gamut
Yes
DCI P3 xy
96.99%
DCI P3 uv
98.02%
Rec 2020 xy
76.41%
Rec 2020 uv
81.38%

Excellent HDR color gamut. The Vizio M65Q8-H1 has near full coverage of the commonly-used DCI P3 color space and great coverage of the wider Rec. 2020. The EOTF follows the PQ curve reasonably well until the roll-off, but most scenes are too dark. The 'Game' Mode EOTF follows the target curve much closer; however, dark scenes are still too dark, and the roll-off is more abrupt.

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

8.0
Picture Quality
Color Volume
Normalized DCI P3 Coverage ITP
86.3%
10,000 cd/m² DCI P3 Coverage ITP
40.9%
Normalized Rec 2020 Coverage ITP
73.3%
10,000 cd/m² Rec 2020 Coverage ITP
34.4%

Great color volume. It displays dark and saturated colors well thanks to its high contrast ratio. It struggles with bright blues, which is typical for LCDs.

8.0
Picture Quality
Gradient
Color Depth
10 Bit
Red (Std. Dev.)
0.100
Green (Std. Dev.)
0.099
Blue (Std. Dev.)
0.096
Gray (Std. Dev.)
0.141

The Vizio M Series Quantum has great gradient handling. There's only some fine banding in the darker shades. There's no setting to help smooth it out, and enabling Noise Reduction doesn't seem to help at all.

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 M Series Quantum doesn't exhibit any signs of temporary image retention after exposing a high-contrast image for ten minutes. However, this can vary between individual 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
7.3
Motion
Response Time
80% Response Time
5.0 ms
100% Response Time
18.1 ms

The Vizio M Series Quantum has decent response time, resulting in only a short blur trail behind fast-moving objects. However, there are some motion artifacts caused by the slower dark scene transitions and overshoot.

7.9
Motion
Flicker-Free
Flicker-Free
No
PWM Dimming Frequency
480 Hz

The Vizio M Series Quantum is flicker-free when the TV's brightness is set to max. However, it flickers at 480Hz in all picture modes when the brightness is set below max.

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
N/A
Min Flicker for 60 fps in Game Mode
60 Hz

The Vizio M65Q8-H1 has an optional Black Frame Insertion feature to help improve motion clarity. When enabled, the backlight's flickering frequency drops to 60Hz. Unfortunately, it causes a bit of image duplication with 60fps content. To turn on BFI, enable Clear Action.

Motion
Motion Interpolation
Motion Interpolation (30 fps)
No
Motion Interpolation (60 fps)
No

The Vizio M65Q8-H1 doesn't have a motion interpolation feature.

8.2
Motion
Stutter
Frame Hold Time @ 24 fps
23.6 ms
Frame Hold Time @ 60 fps
0.0 ms

Due to the TV's slower response time, there's no stutter in 60fps content. However, it can stutter a bit in 24p content.

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 M Series 2020 can remove judder from 24p sources and native apps, but not from 60i/60p sources. To remove judder, enable Film Mode.

7.3
Motion
Variable Refresh Rate
Native Refresh Rate
60 Hz
Variable Refresh Rate
Yes
HDMI Forum VRR
Unknown
FreeSync
Yes
G-SYNC Compatible
No
4k VRR Maximum
60 Hz
4k VRR Minimum
40 Hz
1080p VRR Maximum
60 Hz
1080p VRR Minimum
40 Hz
1440p VRR Maximum
60 Hz
1440p VRR Minimum
40 Hz
VRR Supported Connectors
HDMI

Update 10/26/2020: We've retested the VRR with the new firmware (version 5.10.13.1-2). It now works at all supported resolution.

The Vizio M Series 2020 is advertised to support HDMI Forum VRR to help reduce screen tearing when gaming. We can confirm that it works with FreeSync, but we aren't certain that HDMI Forum VRR works because the Xbox One that we use for testing supports both, and there's no way to tell which one is active. To turn on VRR, enable Variable Refresh Rate.

Inputs
9.6
Inputs
Input Lag
1080p @ 60Hz
11.0 ms
1080p @ 60Hz Outside Game Mode
68.2 ms
1440p @ 60Hz
27.6 ms
4k @ 60Hz
10.8 ms
4k @ 60Hz + 10-Bit HDR
10.0 ms
4k @ 60Hz @ 4:4:4
10.0 ms
4k @ 60Hz Outside Game Mode
67.7 ms
4k @ 60Hz With Interpolation
N/A
8k @ 60Hz
N/A
1080p @ 120Hz
N/A
1440p @ 120Hz
N/A
4k @ 120Hz
N/A
1080p with Variable Refresh Rate
10.5 ms
1440p with VRR
N/A
4k with VRR
10.9 ms
8k with VRR
N/A

Update 10/26/2020: We've retested the input lag with the latest firmware (version 5.10.13.1-2). Unfortunately, we're still unable to measure the input lag at 1440p with VRR, as VRR doesn't work properly when performing our input lag test, even though it works properly during our VRR test. Also, 1440p seems to only work with our laptop. Using an Xbox One, we had to force 1440p, and VRR isn't available when using a forced resolution.

The Vizio M Series Quantum has outstanding low input lag. It's higher when displaying a 1440p @ 60Hz signal, although it's likely a bug that'll be fixed in a future firmware update. To get the lowest input lag, set Game Low Latency to 'On'. Setting it to 'Auto' enables the 'Auto Low Latency Mode', which is a feature that automatically turns on the low latency mode when it detects a game launching from a compatible device.

When using the TV as a PC monitor with chroma subsampling, set the PC to RGB (see supported resolution section) and Game Low Latency to 'On' to get the lowest input lag.

8.3
Inputs
Supported Resolutions
1080p @ 60Hz @ 4:4:4
Yes
1080p @ 120Hz
No
1440p @ 60Hz
Yes (native support)
1440p @ 120Hz
No
4k @ 60Hz
Yes
4k @ 60Hz @ 4:4:4
Yes
4k @ 120Hz
No
8k @ 30Hz or 24Hz
No
8k @ 60Hz
No

Update 12/22/2020: We've updated the firmware to version 1.10.15.1-2 and retested the TV's ability to display a 10-bit 4k @60Hz signal with chroma 4:4:4. The maximum signal that it can display at 10-bit is with chroma 4:2:0.

The Vizio M Series Quantum supports most resolutions at 60Hz. It can display proper chroma 4:4:4; however, it's a little buggy right now. To display chroma 4:4:4 properly, you have to set both the PC and the TV to 'RGB' (setting the PC to RGB grays out the Full Color 444 option on the TV). This is because the Full Color 444 option looks bad and causes text to look more blurry, and setting the PC to chroma 4:4:4 makes it even worse. It's likely a bug that'll be fixed in a future firmware update. Vizio has removed the 'Computer' mode.

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
No
PS5, 4k @ 120Hz
No
PS5, 4k @ 60Hz + HDR
Yes
PS5, 1440p @ 120Hz
No
PS5, 1080p @ 120Hz
No
PS5, Variable Refresh Rate
PS5 can't do VRR yet
Xbox Series X, 4k @ 120Hz + HDR
No
Xbox Series X, 4k @ 120Hz
No
Xbox Series X, 4k @ 60Hz + HDR
Yes
Xbox Series X, 1440p @ 120Hz
No
Xbox Series X, 1080p @ 120Hz
No
Xbox Series X, Variable Refresh Rate
Yes
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
No
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 12/22/2020: We've retested the HDMI ports with the latest firmware version 1.10.15.1-2 and an HDMI 2.1 source. All ports are functioning as HDMI 2.0 even though they're advertised as HDMI 2.1.

Update 10/26/2020: We've retested all the ports for HDMI 2.1 support using an NVIDIA RTX 3080 graphics card. They're all limited to 4k @ 60Hz only, which is to be expected as this TV only has a 60Hz panel.

The Vizio M Series Quantum is advertised to have HDMI 2.1 ports. However, unlike the Vizio P Series Quantum 2020, it isn't indicated which ports have proper support. At this time, they're limited to HDMI 2.0's bandwidth.

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 M Series Quantum supports eARC, allowing the TV to send high-quality object-based audio like Dolby Atmos via TrueHD over an HDMI connection. To use it, set eARC to 'On' and Digital Audio Output to 'Auto'.

Sound Quality
6.0
Sound Quality
Frequency Response
Low-Frequency Extension
134.54 Hz
Std. Dev. @ 70
3.39 dB
Std. Dev. @ 80
3.70 dB
Std. Dev. @ Max
4.07 dB
Max
83.8 dB SPL
Dynamic Range Compression
2.46 dB

The Vizio MQ8's frequency response is mediocre. It delivers dialogue clearly, but there's a noticeable lack of bass. Unfortunately, it doesn't get very loud, so it isn't ideal for noisy environments. There isn't much compression when playing at max volume, though, which is great.

Note: We received reports of audio issues with the Vizio M7 Series Quantum 2020 and the Vizio M8 Series Quantum 2020. Audio seems to cut out during quiet scenes or when there's a pause in sound, such as when scrolling through menus. It also can also make a popping or crackling sound in these situations, as you can see in this video posted on Reddit. It seems to be a problem with the internal speakers, but we've read reports of it continuing with a soundbar as well. We didn't notice this during testing, but if you've experienced the same issue, let us know.

6.5
Sound Quality
Distortion
Weighted THD @ 80
0.576
Weighted THD @ Max
1.267
IMD @ 80
2.62%
IMD @ Max
6.93%

The distortion performance is just okay. It sounds pretty clean when playing at moderate volume levels, but there's a fair amount of distortion when playing at max volume. That said, it depends on the content and might not be audible for some.

Smart Features
7.0
Smart Features
Interface
Smart OS SmartCast
Version 1.40
Ease of Use
Easy
Smoothness
Average
Time Taken to Select YouTube
9 s
Time Taken to Change Backlight
3 s
Advanced Options
Many

Vizio's SmartCast platform is decent. It's user-friendly and runs smoothly for the most part. Other than the bugs mentioned in the local dimming section, we didn't experience any other issues.

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

There's suggested content on the home page, and it isn't possible to disable it. Thankfully, there aren't any ads.

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

There's a good number of apps that come pre-installed, but unfortunately, it isn't possible to add more since Vizio doesn't have an 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 has changed slightly compared to the Vizio M Series Quantum 2019's. It now has a circular navigation pad and a dedicated button for Vizio's 'Watch Free' feature. There's no built-in microphone for voice control.

Smart Features
TV Controls

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

Smart Features
In The Box

  • Remote control
  • 2x AAA batteries
  • User guide

Smart Features
Misc
Power Consumption 69 W
Power Consumption (Max) 181 W
Firmware 1.10.15.1-2

Differences Between Sizes And Variants

We reviewed the 65" Vizio M Series Quantum 2020 (M65Q8-H1), and we expect our results to be valid for the 55" (M55Q8-H1) model as well. There's an M7 variant of this TV, which has a few differences, such as the number of local dimming zones. There's a Black Friday model that's only available at a 70" size, which has slightly reduced features, such as having three HDMI ports instead of four. It likely has a different number of local dimming zones; however, we aren't able to confirm it. If you come across this model, please let us know in the discussions below.

Size Model Black Friday Model Dimming Zones
55" M55Q8-H1   90
65" M65Q8-H1   90
70"   M706x-H3 Unknown

If someone comes across a different type of panel or if their M Series 2020 doesn't correspond to our review, let us know, and we will update the review. Note that some tests, such as gray uniformity, may vary between individual units.

You can see the label here.

Compared To Other TVs

The Vizio M Series 2020 is a good TV for most uses. However, there are better TVs in the same price range, like the Hisense H8G. The Hisense has a much better local dimming feature and more apps through the Google Play Store. For more options, check out our recommendations for the best TVs, the best 4k TVs, and the best 4k gaming TVs.

Vizio M7 Series Quantum 2020
50" 55" 65"

The Vizio M7 Series Quantum 2020 and the Vizio M8 Series Quantum 2020 are very similar TVs, as they're variants of the same model. The M7 has a faster response time and better reflection handling. However, the M8 gets brighter in both SDR and HDR, has more local dimming zones, and it doesn't stutter as much in lower frame rate content due to its slower response time.

TCL 6 Series/R635 2020 QLED
55" 65" 75"

The TCL 6 Series/R635 2020 QLED is a bit better than the Vizio M8 Series Quantum 2020. The TCL gets a lot brighter, it has faster response time, and it can remove judder from all sources. On the other hand, the Vizio has better color accuracy and lower input lag.

Hisense H8G
50" 55" 65" 75"

The Vizio M8 Series Quantum 2020 and the Hisense H8G are very similar TVs overall, with only a couple of differences. The Vizio has a higher contrast ratio, better color gamut, and variable refresh rate support. On the other hand, the Hisense has a better local dimming feature, faster response time, and it gets brighter.

Vizio M Series Quantum 2019
55" 65"

Overall, the Vizio M Series Quantum 2019 is a bit better than the Vizio M8 Series Quantum 2020. The M Series Quantum 2019 has a better contrast ratio and local dimming, faster response time, and significantly better black uniformity. However, if you're planning on playing video games, the M8 Series Quantum 2020 has much lower input lag and variable refresh rate support.

LG CX OLED
48" 55" 65" 77"

The LG CX OLED is significantly better than the Vizio M8 Series Quantum 2020. The LG has an OLED panel and can produce perfect blacks for a better dark room viewing experience. It also has faster response time, a 120Hz refresh rate, and VRR support. However, the Vizio gets brighter in SDR and has lower input lag.

Hisense U7G
55" 65" 75"

The Hisense U7G is much better than the Vizio M8 Series Quantum 2020. The Hisense has a much better local dimming feature but worse black uniformity. The Hisense is a lot brighter in both SDR and HDR, and small highlights stand out way better on the Hisense in some HDR content. Finally, the Hisense is better for gaming, with a 120Hz refresh rate and two HDMI 2.1 ports for next-gen consoles.

Samsung TU8000
43" 50" 55" 65" 75" 85"

The Vizio M8 Series Quantum 2020 is much better than the Samsung TU8000. The Vizio has a full-array local dimming feature, significantly better color gamut and gradient handling, and gets a lot brighter in SDR and HDR. The Samsung has better black uniformity, and it can interpolate lower frame rate content.

Sony X750H
55" 65" 75"

For most uses, the Vizio M8 Series Quantum 2020 is much better than the Sony X750H. The Vizio has full-array local dimming, higher peak brightness, and a significantly better HDR color gamut. It also has better color accuracy, a Black Frame Insertion feature, and variable refresh rate support. The Sony's backlight is completely flicker-free, and its Android TV platform gives access to more apps through the Google Play Store.

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