Jeroenmfb wrote: ↑18 Mar 2023, 15:38
Hi everyone,
I'm having an issue with my monitor and NVIDIA driver. I have G-SYNC enabled + VSYNC (only in nvcp) and the monitor runs at 390Hz. However, when I turn on Reflex + Boost to further lower latency and cap FPS below the monitor refresh rate, it locks my FPS to 351 instead of something close but below 390 FPS.
Has anyone else experienced this or have any suggestions on how to fix it?
Thanks in advance for your help!
PS: I don't know if this is the correct place to post or if I should have posted this under the XV252QF thread
As RealNC already menitoned, it's normal for Nvidia to auto-limit the framerate with G-SYNC + V-SYNC + LLM "Ultra" or G-SYNC + V-SYNC + Reflex, and the higher the physical refresh rate, the lower they set the limit.
At 240Hz, the limit is ~7% below the refresh rate (~224 FPS), and at 390Hz, it's ~10% (~351 FPS).
Now, while it's true that the higher the physical refresh rate, the lower you should probably set the limit due to frametime tolerances narrowing due to a faster scanout time, Nvidia is being pretty aggressive at 390Hz+, it seems.
Why that is, you'd have to take up with them.
That all said, what is often misunderstood about my -3 FPS recommendation is it is a
minimum recommendation, not a hard-and-fast rule. It's a starting point that takes into account the frametime variances of both your typical in-game and external limiter, and while it's usually sufficient for 240Hz or under refresh rates, it may need to be dropped lower at higher than 240Hz refresh rates (say to 3-5% of the physical refresh rate), especially if the limiter being used doesn't have the steadiest of frametime performance.
Then again, the difference between G-SYNC and no sync at 390Hz and higher refresh rates in both average latency and visible tearing artifacts begins to reduce to the point that G-SYNC isn't as useful as it is for lower refresh rates anyway, and once we hit 1000Hz, syncing methods will become virtually unnecessary, regardless of achievable framerates.
