Chief Blur Buster wrote:Lemme reach out to my NVIDIA contacts.
PRO:
That said, early LFC (e.g. LFC kicking in at higher Hz) has a known advantage: It reduces the low-Hz flickering from pixel decay effects and/or artifacts from LCD voltage-inversion logic (e.g. popping up a menu may often trigger a low framerate, that causes it to start to look flickery). Inversion artifacts (such as flickering checkerboard pixel patterns) does get worse at low native refresh rates on certain TN panels. That's where raising LFC min-Hz really helps.
CON:
However, it increases the likelihood of a repeat-refresh scanout still being in progress when the next frame is ready (fording that frame to wait) in fluctuating-frame rate situations, so early-LFC can worsen motion in random-frame rate games. LFC tries to guess the best time to repeat-refresh between frames but if the guess is wrong, the new frame readiness collides with the monitor still being busy in repeat-refresh scanout. The stall (latency) is up to one refresh cycle (1/144sec) depending on how early/late the frame is delivered while monitor is still busy repeat-refreshing. And that also adds a resulting microstutter right at that instant. A trade off effect in monitor-vs-driver engineering.
However, for FreeSync, it is the GPU’s responsibility (aka graphics driver!) responsibility to transmit-out the repeat refreshes automatically. My opinion is the advanced user should choose the VRR range like a Custom Resolution Utility, to choose the preferred trade off.
Re: Freesync, LFC kicks in early
Hello!
I've created an account specifically because this thread speaks to my situation. I'm also eyeballing to purchase an XG2401, and I too also have a GTX 1080 to pair with it. On another site, in foreign language I saw a review that also spoke of g-sync perfectly working except for LFC kicking in early, around 70-72 FPS.
They didn't investigate or discuss it further there, but I'm very happy I could read an official nvidia contact reply here. However I'm absolutely unknowledgeable about anything that was spoken about.
Could you please ELI5 to me what exactly was said? From what I can surmise early LFC means less low framerate flickering..but can introduce more motion blur and/or microstutter when it's being active? Would it do that only sometimes, or does it depend on anything or is it a constant side effect? I've never owned a freesync or g-sync monitor before, so I don't even know what LFC normally looks like.
This is the crux of my issue and these are my main questions. I can only afford a budget 144hz monitor and I really want variable refresh rate if possible at this price point for my GPU. Or should I forget about this and just go for an AOC G2590FX? Does it have a proper g-sync compatible VRR range without early LFC? How trustworthy is AOC's quality testing compared to viewsonic?
Thank you for any and all replies and explanation.