Blur Busters Forums

Hi,
i have tested a lot in Quake Champions to get the lowest possible input lag and also to achieve the best visual smoothness:
(240hz monitor and Nvidia 4090, i7 13700k)
Gsync ON + VSync ON in NVCP + NVCP Low Latency OFF+ Ingame FPS Limiter set to 240 -> Best input lag and best smoothness in my opinion, because the ingame limiter always fluctuates below 240 FPS (even if the fluctuations are quite high, don't know if this is a bug or a feature, because without limiter I'm at over 400 FPS, that shouldn't be a fluctuation at 240)
Gsync ON + VSync ON in NVCP + NVCP Low Latency ULTRA -> causes the FPS to be automatically limited by the NVIDIA drivers at 225. FPS is extremely constant, but somehow feels worse from input lag.

Same was with the old version when Reflex still worked:
Gsync ON + VSync ON in NVCP + NVCP Low Latency ULTRA + ingame Reflex on-> results in FPS being automatically limited by NVIDIA drivers at 225 (NVCP Low Latency is overridden by Reflex). FPS is extremely constant, but somehow this feels worse from the input lag than the example at the top.

If you want to use Reflex without the 225 FPS limitation of the NVIDIA drivers, you have to set Vsnyc On in NVCP to Off, then the FPS are unlimited again, i.e. you have to set the ingame limiter to 240 -> Input lag is low again and good but the smoothness suffers. If Vsync in NVCP off, Gsync does not work properly. Better than if it was completely off, but there are always stutters during respawn or telesporters because frame time fluctuations are heavy when respawning. Or also with packet losses. Overall it also feels less smooth, although there is no tearing.

What is your recommendation regarding these settings and why is the input lag worse when Nvidia limits Reflex to 225 when vsync on in NVCP?
Unfortunately I can't measure the input lag because I don't have Nvidia LDAT. But I have a monitor with Reflex Analyzer. Unfortunately Quake Champions doest have a Latency Flash Indicator.

Nvidia reflex is a marketing thing. It only helps when the GPU is over 80%. It makes no sense to turn it on at low and medium GPU loads. If you correctly limit the FPS, then forget about these things and play calmly.

Ingame a NVCP frame caps will be more erratic the higher the FPS target than RTSS. (uncap the game when using rtss)
Reflex will reduce FPS and be more erratic to avoid a GPU bound scenario, the buffer to lower FPS in order to maintain low latency can be quite big hence the lower framerates.

A erratic frame limiter with Reflex will cause substantialy more erratic FPS, potentially giving you these input latency issues from the V-sync.
Also try take into account of your GPU usage, if it reaches 97+% you will get input latency.
If you use NULL while not GPU bound it can add latency.

Something to help remove stutters if you don't have this config:
NVCP > Adjust desktop size and positioning.
-Scaling mode, No scaling
-Perform scaling on GPU
-Override the scaling mode set by games and programs, ticked

Tiberiusmoon wrote: ↑

26 Apr 2023, 07:54

If you use NULL while not GPU bound it can add latency.

Why?

RealNC wrote: ↑

26 Apr 2023, 08:31

Tiberiusmoon wrote: ↑

26 Apr 2023, 07:54

If you use NULL while not GPU bound it can add latency.

Why?

Not sure on the technical, it may just be the case that something has to read the frame buffer in order to reduce the frame from the buffer, which delays frames that pass through the buffer without being stored when not GPU bound.

Results from IRL latency test:


Source:
https://www.youtube.com/watch?v=7CKnJ5ujL_Q

F1zus wrote: ↑

26 Apr 2023, 07:51

Nvidia reflex is a marketing thing. It only helps when the GPU is over 80%. It makes no sense to turn it on at low and medium GPU loads. If you correctly limit the FPS, then forget about these things and play calmly.

It looks like either the game developers or nvidia has taken this into consideration: I was playing 80 ping with reflex earlier, then after seeing this post I switched to enabled+boost and the game feels more responsive with the same 80 ping.

Update: I checked in another game in UE4 engine and it says the same thing exactly, so it must be part of reflex enabled+boost design.