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27-inch QHD OLEDs come in a wide variety of refresh rates, up to 540 Hz in fact. I tried to find screens closer in speed to the VX2738-2K and came up with Alienware’s AW2726DM and AW2725D, Gigabyte’s MO27Q28G, Asus’ XG27AQWMG, and AOC’s Q27G4ZD.
Pixel Response and Input Lag
Click here to read up on our pixel response and input lag testing procedures.
I didn’t have enough 27-inch QHD OLEDs to compare the VX2738-2K’s panel response, so I have a different group there. You can see that refresh rate doesn’t always go in lockstep with response time. The quickest screen is a 240 Hz Acer at 0.12ms, and the ViewSonic isn’t far behind at 0.20ms. Even at the slowest 0.24ms, you won’t be able to see any differences at speeds above 180fps. The Acer would have a slight edge between 150 and 180 fps. But these are tiny issues that are nearly impossible to see with the naked eye.
In the lag test, the VX2738-2K proved to be one of the faster screens available, with a total lag time of just 15.7ms averaged over 25 mouse clicks using Nvidia’s LDAT tester and utility. 240 Hz is in no way a limitation when compared to the 280 Hz screens in the group, which are a tad slower. Again, this is a minute difference that anyone outside the Jedi Order will be unable to distinguish.
Test Takeaway: The VX2738-2K is very quick with low input lag and smooth motion resolution. At frame rates above 180fps, moving objects render with the same clarity as stationary ones. It is quicker than at least two monitors with higher refresh rates. It’s safe to say that if you want to beat the VX2738-2K, you’ll need to go at least 360 Hz or faster.
Viewing Angles
Many Quantum Dot monitors show a slight red tint in the 45-degree side photo, but not the VX2738-2K. It looks the same as the head-on image with consistent color, brightness and gamma. The top view has slightly reduced gamma and luminance. This is excellent performance.
Screen Uniformity
To learn how we measure screen uniformity, click here.
When I first measured the VX2738-2K’s screen uniformity, it was an unimpressive 13.55%, which is much higher than average for an OLED. Some monitors need an initial pixel refresh cycle to look their best, so I ran the procedure and saw a significant improvement to 2.55%. I have encountered this issue before with Samsung monitors, so ViewSonic is not alone. And once I had done it, the uniformity value did not change. Once set up, the VX2738-2K delivers excellent performance.
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