AOC U27G4XM 27-inch 4K 160 Hz Dual-Refresh Gaming Monitor Review: Speed, Flexibility And Value

It’s a 27-inch dual-mode IPS panel with 4K resolution at 160 Hz, FHD resolution at 320 Hz, and Adaptive-Sync.

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AOC U27G4XM
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(Image credit: © Tom's Hardware)

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To compare the U27G4XM’s performance, I’ve rounded up dual- and single-refresh 4K 27-inch monitors. The dual models are Titan Army’s P2712V, Acer’s XB273K V5, and ViewSonic’s VX2730D-4K. Single-mode displays include TCL’s 27R94 and Gigabyte’s GS27U.

Pixel Response and Input Lag

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

The monitors in the response time chart are different because it’s unfair to compare LCDs and OLEDs in this test. OLED’s black-to-white transition is much faster, which is why they are smoother at lower refresh rates. On planet LCD, the XB273U F5, a G-Sync Pulsar monitor, shares the speed crown with the ViewSonic VX2730D-4K in its 288 Hz FHD mode. The U27G4XM is a bit behind at 3.58 and 3.74 ms, respectively. Doubling the refresh rate does not halve the response time. This is with the overdrive set to medium, which is the smoothest option that doesn’t have ghosting artifacts.

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In the lag test, the U27G4XM takes the win at 320 Hz with a 14ms average of 25 mouse clicks. At 160 Hz, it’s 16.5ms, which is faster than nearly every other screen, including two that are running at 320Hz. So, if you can run in 4K, you’ll have one of the quickest examples available.

Test Takeaway: The U27G4XM has an average panel response for a gaming LCD with an overdrive that removes most motion blur. It’s one of the quickest in my lag test with 14ms at 320 Hz and 16.5ms at 160 Hz. That puts it above all the other 27-inch 4K LCDs I’ve tested except for the ViewSonic VX2730D-4K at 288 Hz. It is certainly the quickest 4K monitor you can buy for $350.

Viewing Angles

AOC U27G4XM

(Image credit: Tom's Hardware)

The U27G4XM’s off-axis image quality is a little better than most of the IPS panels I’ve photographed. The side view has a slight red tint but no change to brightness or gamma. The top view is also a bit red with reduced brightness and gamma. This is a very shareable monitor.

Screen Uniformity

To learn how we measure screen uniformity, click here.

AOC U27G4XM

(Image credit: Tom's Hardware)

It’s safe to say that IPS glow is a thing of the past. Today’s panels, like the U27G4XM, show excellent uniformity with no visible issues whatsoever. My sample had no problems in any part of the screen and was uniform in all field patterns, color and neutral.

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Christian Eberle
Christian Eberle
Contributing Editor

Christian Eberle is a Contributing Editor for Tom's Hardware US. He's a veteran reviewer of A/V equipment, specializing in monitors. Christian began his obsession with tech when he built his first PC in 1991, a 286 running DOS 3.0 at a blazing 12MHz. In 2006, he undertook training from the Imaging Science Foundation in video calibration and testing and thus started a passion for precise imaging that persists to this day. He is also a professional musician with a degree from the New England Conservatory as a classical bassoonist which he used to good effect as a performer with the West Point Army Band from 1987 to 2013. He enjoys watching movies and listening to high-end audio in his custom-built home theater and can be seen riding trails near his home on a race-ready ICE VTX recumbent trike. Christian enjoys the endless summer in Florida where he lives with his wife and Chihuahua and plays with orchestras around the state.