this post was submitted on 28 Sep 2025
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Yes, it's the INT8, not FP8 version.
Why would FSR had anything to do with input lag? The only reason why input lag would increase is due to FSR4 being more difficult to run on RDNA2 which would be due to lower FPS as FPS is also directly tied to input lag.
But we are talking about 120FPS vs 150FPS here when comparing Quality Presets so I doubt you could even tell. And even if you can, just lower the preset, it will still look better and get you to the same performance.
From multiple games I've tested so far my conclusion is that I am almost always CPU limited in most games even with 5800X3D (in CP2077, Hogwards Legacy, Kingdom Come Deliverance 2), most areas are CPU heavy due to a lot of NPCs and FPS drops in those areas enough where my GPU is bored, the only benefit of FSR in those areas is that FSR4 looks better but wont yield any performance benefits.
Input lag is caused by frame interpolation, right? Or nah?
It's because game logic is calculated on real frames and these things lower the real frame rate even though they give you more rendered frames. If you were getting 40 real FPS, and then you go to 30 real fps, you will feel a significant amount of lag even if you are getting 60 fps in fake frames. Basically the game loop is running slower and stuff like input polling is happening slower even if you have a higher frame rate.
Framegen is worse the lower your base frame rate is.
The penalty to the speed at which the game runs is much more significant, if you normally run at 40 fps and framegen gives you 60 (30 real) then you have introduced 8 ms of latency just from that. While the same 25% performance cost going from 180 fps to 270 (135 real) adds just 2 ms.
The lower your real frame rate is the harder it will be to interpolate between frames because the changes between frames are much larger, so it will look worse. Also the lower your frame rate the longer any mishaps will remain on screen, making them more apparent.
True, Ig I was trying to teach people about why FSR often causes input lag. If you are getting 120 real frames then yeah, it probably won't matter much, but if you are getting less then 60 real frames it's going to be a worse experience unless you are playing menu games or something.
Yeah I just wanted to illustrate that with some numbers :)
It's a bit counter-intuitive that frame generation is worse the lower your base frame rate is. And Nvidia in particular has no interest in making it clear that this tool is only really good for making a well-running game run even better, and is not going to give your 5070 "4090 performance" in any meaningful way.