Viewing Angles, Uniformity, Response And Lag
To learn how we measure screen uniformity, please click here.
Viewing angles work a little differently with curved screens. You're never at a constant angle of departure when you view the image off-axis. The more-subtle 3800R curve of the X34, however, means a result that's a little closer to a flat panel. IPS is still the king here and this particular part does pretty well. While you can see an obvious light fall-off, there is only a slight color shift to blue; much better than the red or green shift we usually see. Top-down viewing is not as good with a significant green tint and reduction in light.
Screen Uniformity: Luminance
We suspect the manufacturing challenges of curved panels are the reason for their high prices. The upside seems to be better quality control. We haven't seen any issues with the curved monitors that have passed through our lab tests. The X34 takes the crown with a superb 5.25-percent black field result. There is no light bleed or glow or any other artifacting going on here.
Here's the white field measurement.
The white field measurement is equally impressive at only 6.07 percent. While we can't attest to every sample, ours is certainly beyond excellent.
Screen Uniformity: Color
Color uniformity is a tough test for any LCD panel technology. A 1.15dE variance is extremely small and well below the visible level. Kudos to Acer's quality control for taking the top two places in this test.
Pixel Response And Input Lag
Please click here to read up on our pixel response and input lag testing procedures.
We set Overdrive to Extreme and overclocked the refresh rate to its 100Hz maximum for our response and lag tests. The numbers are as expected. The bottom two screens run at 75 and 60Hz respectively while the top three hit either 144 or 165. While overdrive offers the quickest panel response, some monitors show too much ghosting to make it a viable option. The X34 is not one of those. Even though we saw thin white trails in the BlurBuster's UFO test, we didn't see any problems in gaming content.
Here are the lag results.
Again the fastest result will come from the highest refresh rates; 165Hz in the case of the top two displays. A delay of just over two frames at 60fps is nothing to worry about for most of us. We're not sure even that most hyper-active gamers would see a difference. But if you want the lowest possible lag, you've got to go for a higher refresh rate. That will, of course, necessitate a really fast (and expensive) video card.
Obviously there is no reason to run a max refresh less than 100Hz if your system can remain stable at that speed. Once you've set the overclock and rebooted the X34, you're free to enjoy the chosen rate in both games and Windows applications. You can verify the signal info and G-Sync status in the OSD's info screen.
There is no lower fps point on a G-Sync monitor where frame tearing will occur. When the action drops below 30, the video card simply double-buffers each frame to prevent artifacts. So the only question with the X34 is whether or not you want to use the overdrive options.
It's easy to see a difference in the BlurBusters UFO pattern between the Normal and Extreme settings. Both will ghost a little; Extreme more so. In content, however, it's not as cut and dried. For us it depended on the intricacy of on-screen detail. In a title like Far Cry 4 where every leaf and blade of grass is rendered using complex textures, ghosting was fairly obvious. But turning overdrive off made motion blur come to the fore. It's a six-of-one, half-dozen-of-the-other proposition. Ultimately we preferred to leave overdrive on Extreme and enjoy sharper edges with clearer delineation and transition between dark and light objects.
In a less detailed game like Tomb Raider, we weren't able to see any effects of overshoot or motion blur. There just aren't enough nuances in the graphics to show artifacts like these. So the conclusion is that you'll have to reach for the overdrive's bezel hotkey and decide for yourself based on what game you're playing and the detail level you've chosen for your particular setup.