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 to produce deep blacks. Its high peak brightness fights glare easily and delivers an exceptional HDR experience with highlights that pop. Gaming feels smooth and responsive, as it has low input lag, a fast response time, and a high refresh rate. Unfortunately, it has pretty narrow viewing angles, so it might not be the best option if you have a large room with a wide seating arrangement. Also, even though it has variable refresh rate support to help reduce screen tearing, it isn't functional right now. Vizio's SmartCast platform has a decent number of apps; however, there's no way to add more since there's no 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're not sure what the cause is; we'll provide an update if there are any changes.
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 too, 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.
The Vizio P Series Quantum X 2020 is great for watching movies. It has an excellent 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.
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.
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.
The Vizio P Series Quantum X 2020 is great for gaming. Its low input lag, fast response time, and high refresh rate result in a smooth and responsive gaming experience. Its high contrast ratio and exceptional black uniformity make it an excellent choice for gaming in the dark. It has variable refresh rate support to minimize screen tearing; however, it doesn't work at this time and requires a firmware update.
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 outstanding HDR color gamut, and it gets more than bright enough to make highlights pop. It has a good local dimming feature, but the blooming can be a bit distracting, especially if you tend to watch with subtitles.
The Vizio P Series Quantum X 2020 is great for gaming in HDR. It provides a fantastic gaming experience with its low input lag, fast response time, and high refresh rate. HDR games look amazing, as it has an outstanding color gamut and gets incredibly bright to make highlights stand out. It has VRR support to reduce screen tearing, but it isn't functional at this time. Also, while it has a good local dimming feature, there's visible blooming around bright objects.
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.
The Vizio P Series Quantum X has an excellent design. It's simple and clean, with thin borders and wide-set feet.
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"
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.
The borders are very thin on all sides and aren't distracting.
The TV is thin and doesn't stick out when wall-mounted.
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.
Update 10/21/2020: We've retested the contrast ratio with local dimming after updating the TV to the latest firmware (version 18.104.22.168-2). The recommended local dimming setting is 'Medium', as it has the most effect on the contrast ratio, raising it to 14345:1.
The Vizio P Series Quantum X has an excellent 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.
Update 10/21/2020: We've updated the TV's firmware to version 22.214.171.124-2. 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 'High' setting (local dimming is called Active Full-Array), as there's almost no difference between 'Medium' and 'High', except that the 'High' setting gets a bit brighter and doesn't crush blacks as much as the 'Medium' setting.
There's some blooming around bright objects, but not nearly as much as on the Vizio P Series Quantum 2020, likely due to its higher lighting zone count. It can look a little blotchy in dark scenes with small highlights, like a star field, as the combination of blooming and crushing of more distant stars makes the screen look uneven. Unfortunately, subtitles are bright, and there's a lot of blooming around them.
Zone transitions are visible, but not as much in regular content as when using our test pattern. It follows slow objects relatively well; however, it struggles to keep up with fast-moving objects, with the leading edge often lagging and trying to catch up in brightness.
The 65" model has fewer lighting zones while the 85" model has more. We expect them to perform differently.
Update 10/21/2020: We've retested the SDR peak brightness after updating to the newest firmware (version 126.96.36.199-2) 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.
Update 10/21/2020: We've retested the HDR peak brightness with the latest firmware update (version 188.8.131.52-2), 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 outstanding 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.
Gray uniformity on our unit 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.
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.
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.
Excellent reflection handling. Combined with the TV's high brightness, you shouldn't have any visibility issues, even in the brightest environments.
Before calibration, the 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.
Update 10/21/2020: We attempted a new calibration after updating to the latest firmware (version 184.108.40.206-2) 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.
Upscaling of 480p content looks decent, but it isn't as good as other recent 4k TVs.
The Vizio P Series Quantum X 2021 upscales 720p content, such as from cable boxes, well.
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.
The Vizio P75QX-H1 has an outstanding 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.
Great 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.
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.
There are no signs of temporary image retention; however, it can vary between units.
We don't expect VA panels to experience permanent image retention, as the VA panel in our long-term test appears immune.
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.
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.
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.
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.
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.
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.
Update 10/23/2020: we've retested the VRR with an NVIDIA RTX 3080 and the latest firmware (version 220.127.116.11-2). 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 HDMI Forum VRR to reduce screen tearing when gaming; however, it doesn't work at this time. When enabled, the screen tears, flashes, and turns off momentarily about every thirty seconds. This is likely a bug that'll be fixed in a future firmware update. We'll retest it once the update available.
To turn on VRR, set Game Low Latency and Variable Refresh Rate to 'On'.