I'm having trouble with multi-frame generation on an RTX 4090. With frame generation disabled, I get around 80 base FPS. With 2x, 3x, or 4x generation enabled and no limiter, the base rate is about 60 FPS. However, enabling Reflex, RTSS, or V-Sync through the NVIDIA app causes the base FPS to drop to roughly 30 FPS. This increases input latency and creates noticeable distortion around the edges of the screen, almost like a fishbowl effect. Is there a limiter that caps the generated frames while leaving the base FPS unchanged, or is this expected behavior?
3 Answers
In the example shown, the 120 FPS cap is doing exactly what it was configured to do. With 4x generation enabled, reaching 120 total FPS requires about 30 rendered frames, with the rest being generated. The generated frame count may look high, but the underlying game-rendered FPS is still 30.
This is expected with a fixed MFG multiplier. The driver can’t generate a fractional number of frames per rendered frame. For example, with 4x generation and a 120 FPS cap, it needs to render 30 real frames and generate three additional frames for each one, resulting in 120 FPS total. That’s why the limiter reduces the base rate to 30 FPS rather than keeping it near 60.
Dynamic mode may help somewhat because it can switch between multipliers to target a desired total FPS instead of using one fixed multiplier. However, it isn’t a perfectly strict limiter, and it still may not preserve a higher base FPS under a 120 FPS cap.
So this is working as designed? I also tried dynamic mode, but it still seems to hold the base rate around 30 FPS. I’m using a 120 Hz LG C2, so maybe these MFG modes are mainly intended for higher-refresh displays. Regular frame generation didn’t cause this problem for me.