Corporal.Hicks
Member


I recently bought a 4K, 240 Hz QD-OLED monitor (Gigabyte FO32U2) and, although I'm pleased with its picture quality, the DSC technology is terrible. I never experienced any black screens on my old Gigabyte M27QP (1440p, 170 Hz) LCD monitor connected to my RTX4080S, but as soon as I connected the OLED monitor with DSC enabled, I started seeing them. The latest firmware update for my monitor has drastically reduced the frequency of black screens, so it's tolerable, but I still see them from time to time.
However, DSC affects my aiming very noticeably, and that is not tolerable. I have been playing Quake 1, 2 and 3 since 1999, so my aiming and reaction times are much better than the average gamer's. With DSC enabled, I can no longer aim accurately. I don't know if it's a lag issue or if the GPU drivers don't sync mouse movement correctly, but my precision takes a big hit with DSC enabled. Not even Vsync, or DLSS FG reduce my precision so much. Luckily my monitor has DSC switch and 1440p 240Hz is still very usable from up close on such big monitor (my monitor has dedicated 24'inch 1440p picture mode). Also, if I use HDMI 2.1 (48 Gbps), I can play at 4K 200 Hz 8-bit without DSC (or 170 Hz 10-bit), which is good enough for me (aiming feels perfect). However, if I had known that the DSC input lag was so noticeable, I would have bought the more expensive DP2.1 monitor and changed my GPU sooner.
Edit : I managed to get a responsive experience with DSC and a 222 fps cap (using RTSS) instead of the usual 237 or 240 fps cap. The DSC lag is still there, but it's now so minimal that I can barely feel it, and it doesn't affect my aim. I can finally enjoy playing games with the DSC on like on my previous monitor!
I wonder, though, why playing with uncapped FPS and DSC leads to such noticeable input lag. Perhaps some VSync buffers are filling up, preventing DSC from working optimally. Without the RTSS cap, my vsynced frame rate is 240 fps or 225 fps if I use the ultra-low latency settings in the Nvidia drivers. Both 240 fps and 225 fps feel terrible, but capping the framerate with RTSS at 222 fps solves the input lag problem.
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