AOC U32G4 32-inch 4K Dual-Refresh gaming monitor review: Solid performance and value

There is no shortage of 27-inch gaming monitors to choose from. This size strikes a balance between screen area and desktop footprint. But who would turn down a 32-inch panel when it comes to the best gaming monitors? No one I can think of. It requires a bit more room, but if you have it, it’s a screen size that lets you keep multiple apps open and edit documents side by side. It’s also a great window for the detailed graphical worlds found in today’s most popular games.

Larger screens always cost more than smaller ones, or do they? Following my recent review of AOC’s U27G4XM, a 27-inch 4K Mini LED panel that sells for $350, I have the U32G4. It also uses a 4K panel with a dual-refresh operation that toggles between 4K/160 Hz and FHD 320 Hz. It forgoes the Mini LED for an edge array, but in doing so, it actually costs less while being larger, 32 inches diagonal. It also has Adaptive-Sync, wide gamut color, and HDR. Let’s take a look.

AOC U32G4 Specs

The U32G4 starts with an IPS panel that’s both fast and full of contrast. I measured around 1,100:1, which is a little higher than average for the category. Keep in mind that an OLED with similar specs will cost you close to $1,000, so this AOC is a terrific bargain. Speed comes from a 160 Hz refresh rate and a decent overdrive. You also get backlight strobing that can be used in concert with Adaptive-Sync. That’s something usually reserved for high-end gaming screens. The dual-mode feature doubles the Hertz to 320 and sets the resolution to FHD (1920×1080). That’s a bit soft for such a large screen, but it nearly eliminates motion blur.

There’s plenty of color and brightness here with 480 nits available for SDR content. Contrast is solid with respectable black levels that are a little lower than the average IPS panel. No Quantum Dots are used, but color coverage is measured at 90% of DCI-P3. HDR10 content is supported, with a VESA DisplayHDR 400 rating. And three HDR emulation modes work to increase the dynamic range of SDR material.

Gamers get a nice set of extras, including aiming points with a dynamic option, sniper modes, and a frame counter. There are no LED lights, USB ports, or internal speakers. But you do get a precise four-level overdrive and the backlight strobe, which can be used along with Adaptive-Sync. That’s a boon for those who want to stay at 4K resolution but don’t have a fast enough video card to run at 160 fps. Of course, the 320 Hz/FHD option is just a button click away.

If you’re willing to give up the U27G4XM’s Mini LED backlight, the U32G4 represents a phenomenal value. $320 for a 32-inch 4K gaming monitor? That’s a deal well worth checking out.

Assembly and Accessories

The U32G4 ships in crumbly foam packaging, with the base, upright, and panel requiring toolless assembly. Once done, it’s a reasonably solid piece with a wide stance and good stability. The power supply is internal, so you get an IEC cord plus DisplayPort and HDMI cables.

Product 360

The U32G4’s styling is simple and elegant, with the panel’s shape formed from triangles in the back. A bright red trim ring encircles the fulcrum in the back and the words “AOC Gaming” appear as well. The cooling vents are hidden inside the gap you see at the top.

The screen has an 8 mm-wide flush bezel with a 20mm strip across the bottom. Under the right corner are four OSD control keys and a power toggle. A tiny status LED glows orange in standby and white when the power is on. The screen’s anti-glare layer keeps ambient light from spoiling the image while being clear and grain-free.

The stand is secure and tight in operation. It includes a red-trimmed cable hole that’s turned to the side, so it doesn’t show from the front. Ergonomics include a 5/23-degree tilt, 20-degree swivel, and a 5-inch height adjustment. You also get a 90-degree portrait mode. Movements are firm and smooth with little to no play. Though relatively lightweight, the U32G4 is a solid piece of gear.

There isn’t much happening on the I/O panel, except for a DisplayPort 1.4 port and two HDMI 2.1 ports. There are no internal speakers, but you can plug headphones into the 3.5mm jack. There are no USB ports or LED lighting. If you prefer to use a monitor arm, a 100mm VESA mount is provided with fasteners included.

OSD Features

To summon the U32G4’s OSD, press the right-most control key. Don’t press the power toggle by mistake, as I did several times. The menu is convenient and concise, and divided into seven sections.

The Game Setting menu starts with the dual mode feature, which includes 4K 120 Hz, 160 Hz, and FHD 320 Hz modes. The quicker way to switch is to press the second button, which pops up a quick menu and changes modes in a few seconds. You’ll need to visit the Nvidia or AMD control panel once to set each mode, then you can toggle back and forth at will.

There are also game modes in addition to the Eco picture modes. That makes for many possible combinations, so I suggest sticking with Standard/Standard for all content. It’s the closest to spec and calibrates to a high standard. This menu also offers shadow control for low-end gamma, a color saturation slider, a dial point (the aiming point, static or dynamic), and three sniper magnifications. The second screen has MBR and MBR Sync, which is the blur-reducing backlight strobe. Sync means you can use it along with Adaptive-Sync. There is a little phasing, but it is effective at keeping blur at bay when frame rates drop below 120fps. You can also turn on a frame rate indicator. The overdrive has four levels, of which Faster strikes the best balance between ghosting and blur reduction at 160fps.

The Picture menu contains the eight main picture modes. Standard works the best, and I used it for all testing and gameplay. You can adjust the color temp with fixed modes and a set of RGB sliders. There are five gamma presets, color management and three gamut options. Panel Native covers around 90% of DCI-P3 and is suitable for all SDR and HDR content. The sRGB mode is accurate enough to qualify for color-critical applications.

There are three HDR emulation modes that extend the perceived dynamic range of SDR content. When HDR10 signals are present, a fourth mode appears, Display HDR. It is the best choice for its accurate grayscale, EOTF, and color tracking.

The only other peripheral feature I noted here was PIP and PBP. You can view two sources at once and the PIP window can be moved and sized. You can swap the windows and select which one plays audio through the DisplayPort or HDMI inputs.

AOC U32G4 Calibration Settings

The U32G4 looked a tad warm to my eyes, and initial measurements showed it was a little short on blue in grayscale patterns. It can be used without calibration, but a few tweaks to the RGB sliders removed all visible errors. Gamma runs a shade dark on the 2.2 setting. Changing it to 2.0 was too much; it washed out the image. I noted that the sRGB mode had no calibration options, but it tracked grayscale and color with reasonable accuracy, though it showed a few gamma quirks. I’ll tell you more about that on page four. HDR signals have four modes available, with Display being the best choice. They cannot be calibrated. Below are my recommended SDR settings. Please enjoy.

Gaming and Hands-on

Right out of the gate, I could see how quick the U32G4 was. Even at a “mere” 160 Hz, it delivered smooth motion thanks to its precise and artifact-free overdrive. It’s one of the better implementations I’ve seen, especially at this price point. I used the Faster setting (third of four) and was rewarded with no perceivable motion blur. I was able to stay at 160fps thanks to a GeForce RTX 4090.

I tried the backlight strobe and found it effective at lower frame rates. I capped the action at 120 Hz and still had a smooth experience. It keeps Adaptive-Sync on, which is something I’m rarely able to do. There aren’t many monitors at any price that have that ability. If you have a slower video card, you can still enjoy 4K resolution at lower frame rates.

The dual-mode switch worked without issue once I set it up in the Nvidia control panel. You can toggle it in the OSD or press the second control key for a quick menu that does it faster. Running FHD on a 32-inch monitor is soft at best, but there’s no denying the benefit of 320fps. The U32G4 is quick at 160 Hz and super-quick at 320 Hz. This is also a good way to enjoy high frame rates from a budget gaming PC.

There are no Quantum Dots here, so I missed a little green saturation. But otherwise, the U32G4 is very colorful. DCI-P3 coverage is around 90%, so there is plenty of color for SDR content. The sRGB gamut option is useful when a smaller color space is needed, but I noticed slight gamma issues. Shadow areas were a bit light, and some highlights were muted. You can see why in the tests on page four.

For workday tasks, I stuck with Panel Native and a few tweaks to the RGB sliders to remove all grayscale errors. Gamma is a shade dark, but there is no loss of detail. Set the brightness slider to 200 nits, and you’ll enjoy a vivid and pleasing image.

4K at 32 inches has plenty of pixel density at 139ppi. That’s fine enough to hide the dot structure unless you sit inches from the screen. Text is smoothly rendered without visible jaggies. Graphics look realistic with photos being particularly enjoyable. That might have something to do with the large format. 32 inches is my go-to and it’s the size of my reference screen. It’s perfect for writing where I need to keep extra windows open to refer to charts and data. Spreadsheets can be viewed with much less scrolling, and webpages display more of their content too. Photoshop lets you see the picture and keep lots of toolbars at hand.

Takeaway: For $320, it’s hard to imagine a better 4K gaming monitor than the U32G4. It’s fast, bright, and colorful. It doesn’t have USB ports or internal speakers, but it does have all the goods for high-performance gaming with low input lag, smooth motion resolution, and accurate color. It’s equally adept at productivity with lots of screen area for documents and large, clear text. If you have the desktop space for something bigger, a 32-inch monitor is a great option.

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For all tests except panel response, I’ll be comparing the U32G4 to a group of 27-inch 4K screens. My database doesn’t have any current 32-inchers except for BenQ’s PD3226G. The other displays are AOC’s U27G4XM, ViewSonic’s VX2730D-4K, Titan Army’s P2712V, and Gigabyte’s GS27U.

Pixel Response and Input Lag

Click here to read up on our pixel response and input lag testing procedures.

The response test group consists of the last five LCD panels I’ve tested, so their sizes and resolutions vary. It’s interesting to note that refresh rate doesn’t always mean faster screen draw. That is a function of the overdrive. When I test, I set it to where there are no ghosting artifacts. This is usually not the fastest setting. In the U32G4’s case, doubling the refresh rate adds a scant 0.16ms to the score. This is an imperceptible amount. The overdrive is effective, but the first three panels will be a touch smoother at the indicated refresh rates. Remember that an OLED panel is about ten times quicker with draw times around 0.25ms.

In the lag test, the U32G4 takes the win at 320 Hz with a 13.4ms score. This puts it on par with many premium gaming monitors. At 160 Hz, it manages to outdo three monitors with higher refresh rates. For the price, this kind of performance is hard to beat.

Test Takeaway: The U32G4 is one of the faster gaming monitors I’ve tested. It’s worth pairing with a video card powerful enough to run at 160 Hz at 4K resolution, as it offers excellent overdrive and very low input lag. To get smoother processing, you’ll need an OLED, which will cost you around three times as much. This is impressive performance to say the least.

Viewing Angles

The green tint seen in the U32G4’s 45-degree side photo shows its IPS origin. But it isn’t the most tint I’ve seen. And there is no change to gamma or brightness, which is a major plus. This is a very shareable monitor. The top view has a red cast with reduced gamma and luminance.

Screen Uniformity

To learn how we measure screen uniformity, click here.

I noticed a Uniformity picture mode, which indeed improves uniformity but at the cost of peak brightness and contrast. No matter, because my U32G4 sample scored an excellent 6.58% in its Standard mode. There are no visible issues here in any test pattern or content. This is excellent performance.

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To read about our monitor tests in-depth, please check out Display Testing Explained: How We Test PC Monitors. We cover brightness and contrast testing on page two.

Uncalibrated – Maximum Backlight Level

The U32G4 is fairly bright for its size. Most 32-inch screens do well to hit 400 nits unless they have Mini LED backlights. At 480, the U32G4 is nearly as bright as its 27-inch Mini LED stablemate, the U27G4XM. If you use a 32-inch monitor at 480 nits, you will tire quickly unless your room is sunlit, or you’re outside, say in a location shoot tent. The black level is respectable for an IPS monitor, so you get 1,154.9:1 contrast, which is a tad above average. Only the ViewSonic boasts more dynamic range.

After Calibration to 200 nits

After calibration, the U32G4’s black level goes up to second place behind the overachieving VX2730D-4K, and contrast stays consistent at 1,147.4:1. ANSI contrast is also very consistent at 1,088.4:1, keeping it ahead of all but the ViewSonic in this group of tests. This is excellent performance.

Test Takeaway: You won’t mistake the U32G4 for an OLED or VA monitor, but among IPS screens, the most common tech, it stands out with solid contrast and good black levels. It also has high brightness, which is an asset for outdoor use or if you have a very sunny office like me.

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The U32G4 is on the edge of needing calibration. I expect most users will be satisfied with the image as it comes out of the box. If you do tweak, stick to the Standard/Standard mode which allows access to RGB sliders, gamma presets and color gamut options.

Grayscale and Gamma Tracking

Our grayscale and gamma tests use Calman calibration software from Portrait Displays. We describe our grayscale and gamma tests in detail here.

In the first chart, you can see that the U32G4 is a tad warm in tone, but the errors are close to the 3dE threshold. Brightness levels below 50% have no visible issues. This is solid performance for the money. Gamma runs a tad dark with rising values in the 60-90% range. This is a small error that won’t adversely affect real-world content. Some highlights may look muted, but problems will be hard to spot.

Calibration tightens up grayscale tracking by bringing all errors below 2dE. You won’t see anything but perfectly neutral tones here. Gamma is a shade lighter too, which is a subtle but positive change. Considering that the U32G4 is a 32-inch 4K monitor for $320, I can’t complain.

The sRGB mode has similar grayscale tracking, but gamma is a bit askew. The dip at 10% means dark areas will be too light. As the values rise, it mutes highlight areas, especially in the 80-90% brightness region. The U32G4 can be considered qualified for critical applications, but some compensation for the gamma error should be made.

Comparisons

In the default comparison, the U32G4 sits right on the edge of “needs calibration.” I would say it does, but I’m pickier than most. It’s an occupational hazard. I doubt too many gamers would complain. But if you tweak, at least with my recommended settings, you’ll make visible gains in image quality. Not only are the neutral tones more neutral, but the gamma is also a tad lighter, which gives the picture more verve.

Though gamma is a shade dark, its tight range of values mitigates the visual impact of any inaccuracy. The range is small at 0.12 while the deviation is 3.64%. That equates to an actual value of 2.28, not too far from 2.2. This is excellent performance for a budget gaming monitor.

Color Gamut Accuracy

Our color gamut and volume testing use Portrait Displays’ Calman software. For details on our color gamut testing and volume calculations, click here.

The default color chart shows excellent tuning on AOC’s part, with only slight hue errors in magenta and cyan. Green comes up a tad short of full coverage thanks to the lack of Quantum Dots. The inner points hit their marks, but you only get around 85% of the green primary. This is typical of non-QD LCD panels.

Calibration corrects secondary hue errors without changing any saturation points. The improvement is subtle but visible. This is excellent performance.

The sRGB chart adheres well to the standard despite the gamma errors I noted earlier. This is why you can use the U32G4 for critical work. Gamma issues can be compensated for using a software profile if you wish.

Comparisons

This is a solid group of color-accurate monitors, with the U32G4 in fourth place. If you lined them all up, you’d see very little difference except for the top three, which cover more of the green primary. From a precision perspective, the U32G4 holds its own with more expensive displays. DCI-P3 coverage comes up a little short of 90%, but for the price, there is nothing to complain about. sRGB coverage is ideal at 99.32%.

Test Takeaway: The U32G4 is very accurate out of the box when price is considered. You’re getting a 32-inch 4K display for $320. That alone is enough. With calibration, it delivers solid accuracy with its only weakness being green primary coverage when referenced to DCI-P3. The sRGB mode has excellent gamut accuracy and only needs improvement to its gamma tracking. Overall, the U32G4’s color performance is more than good enough to satisfy users looking to save a bit of money on a large screen.

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Our HDR benchmarking uses Portrait Displays’ Calman software. To learn about our HDR testing, see our breakdown of how we test PC monitors.

The U32G4 supports HDR10 content with an automatic switch and four specific picture modes. It can also mimic HDR’s dynamic range with three emulation modes for SDR signals.

HDR Brightness and Contrast

I was surprised to see that the U32G4’s HDR peak was a little lower than its SDR number. This isn’t a huge deal, but it does narrow the gap between SDR and HDR in terms of impact. I also noted that there was no dynamic contrast in play. There is no edge-zone or field dimming, and the DCR option in the picture menu is grayed out. This means there is no difference in black levels or contrast between SDR and HDR. In both modes, you get around 1,100:1. The U32G4 supports HDR but doesn’t embrace it. This is also true of the ViewSonic, Titan Army, and Gigabyte displays. If you want high-impact HDR from an LCD, go for a Mini LED screen like the U27G4XM.

Grayscale, EOTF and Color

In the HDR grayscale test, there is a slightly warm tone, but the error is barely visible in content. That’s a good thing because there are no adjustments available. The highest errors just crack 4dE, not bad for a budget display. The EOTF tracks very closely to the reference with a little lightness around 40-50% brightness and an elevated black level seen at the 0-5% part of the chart. The tone map transition at 65% is correct for the measured black and white thresholds.

The color test shows a little oversaturation, but no more than any other HDR monitor I’ve tested. This is a typical approach taken by most displays that gives HDR more punch. It’s effective in the U32G4’s case with no cause for complaint. Hue tracking is on point. The DCI-P3 chart is a tad short on green; also typical for non-Quantum Dot screens. In the BT.2020 test, the U32G4 runs out of color at 85% red, 70% green and 90% blue.

Test Takeaway: The U32G4 is a color-accurate HDR monitor but not a particularly bright or impactful one. It has no dynamic contrast available to extend that range but that isn’t unusual at this price point. The standard is supported with accurate color and luminance tracking, but HDR doesn’t look significantly different from SDR.

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Now that 4K monitors are becoming available at truly attractive prices, the array of choices is vast. But it seems they’re mostly concentrated in the 27-inch category, if my review database is any indication. I doubt there are users who would choose a 27 over a 32 unless they just don’t have the room. 32 inches used to be a significant price jump, but no more. The AOC U32G4 is $320, and for that sum, you get a lot.

Its IPS panel has slightly higher than average contrast at around 1,100:1. Color is accurate with no real need for calibration, but you can tweak it for a small improvement. It’s bright at over 480 nits peak though HDR is a little less vivid at around 450 nits. And it doesn’t offer dynamic dimming so the quality difference between SDR and HDR is small. In all scenarios though, it is very colorful. You don’t get Quantum Dots, but you do get 90% coverage of DCI-P3.

Video processing is on par with many premium screens thanks to a precise overdrive and extremely low input lag. The U32G4 also lets you run backlight strobing with Adaptive-Sync, a feature that very few monitors offer. And the dual-mode feature works without issue if you want to race around at 320fps in FHD resolution.

If you only have a small monitor budget but want a large screen, the AOC U32G4 is pretty much a no-brainer. It’s fast, bright, and colorful, and games with the best monitors I’ve reviewed. It’s versatile too, with dual-refresh and MBR Sync. For $320, it has no real competition. Budget-conscious gaming PC owners should definitely check it out.

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