NVIDIA Reflex Low Latency - How It Works & Why You Want To Use It

[jorimt]

Does anyone know how I can fix Reflex + VSync + ULLM locking frames to 225? I expected it to jump to at least 260 fps when I changed monitors, but it seems to be stuck at 225 from previous 240Hz monitor. I've tried switching each option on/off, but that didn't change anything. Am I forced to play without V-Sync and lock my frames manually now? I quite enjoyed the automatic fps cap before.

You didn't mention your new monitor model, or even its maximum refresh rate. Are you saying you now have a higher than 240Hz monitor, and the Reflex/ULLM auto limit is still at ~225 FPS, even when the physical refresh rate is set higher?

[Patryk]

Ouch, yeah, sorry for the lack of details. I did post here way prematurely, mainly because I was trying to find some documentation about how that fps cap works and failed. Monitor is AW2723DF set to 280Hz. That was my fault as it turned out that I had RTSS running for the last 3 years with a cap to 225 fps that I completely forgot about. You don't wanna know how dumb I felt. I really appreciate you trying to help me though!

[jorimt]

That was my fault as it turned out that I had RTSS running for the last 3 years with a cap to 225 fps that I completely forgot about.

Ah, it happens (I've left a global RTSS limit enabled at times and wondered why a certain game's FPS won't exceed it myself before).

[fjskmdl]

Does anyone know what could be the reason i cannot choose nvidia reflex and SMP in the Iracing graphics settings? they are greyed out.
In for example cyberpunk i do can set nvidia reflex

[marcel151]

I would like to bump this thread for 1-2 specific questions regarding capping the FPS and not capping the FPS.

I thought that you'll get screen tearing when going over monitor refresh rate. Since tearing is triggering me, I always cap my FPS. But I now heard that tearing is negligible when having very high FPS and it will also affect input latency in a positive way. Is that true?

So when playing high FPS games: NVIDIA Reflex ON + driver V-SYNC OFF or application controlled.
When playing not high FPS games or FPS < Monitor Hz: NVIDIA Reflex ON + driver V-SYNC ON.

Correct? Are there any tests out there when comparing NVIDIA Reflex High FPS vs screen cap input latency?

[jorimt]

I thought that you'll get screen tearing when going over monitor refresh rate. Since tearing is triggering me, I always cap my FPS. But I now heard that tearing is negligible when having very high FPS and it will also affect input latency in a positive way. Is that true?

See:
https://blurbusters.com/gsync/gsync101- ... ettings/9/

So when playing high FPS games: NVIDIA Reflex ON + driver V-SYNC OFF or application controlled.
When playing not high FPS games or FPS < Monitor Hz: NVIDIA Reflex ON + driver V-SYNC ON.

Up to context and what you're trying to accomplish.

Are there any tests out there when comparing NVIDIA Reflex High FPS vs screen cap input latency?

The link I shared covers those scenarios indirectly.

[RealNC]

PSA: The latest version of RTSS allows you to use Reflex in every DX11 and DX12 game and limit FPS using the Reflex limiter rather than the normal RTSS limiter:

https://forums.guru3d.com/threads/msi-a ... st-6172420

Added new framerate limiting mode : NVIDIA Reflex mode. In this mode RivaTuner Statistics Server completely disables its own precise framepacing implementation and uses NVIDIA's own framerate limiter instead. This mode is mainly intended to be used in conjunction with DLSS Frame Generation, which is generally not compatible with any third party framerate limiters. However you can also use this mode in the games with no native NVIDIA Reflex support, because enabling NVIDIA Reflex framerate limiter in such titles will also enable Reflex low-latency mode as a side effect. Please take a note that NVIDIA Reflex framerate limiting mode is currently supported on NVIDIA GPUs and in Direct3D11/Direct3D12 applications only. If you try to enable it on unsupported hardware on in unsupported applications, RivaTuner Statistics Server will fall back to default async framerate limiting mode.

[Kyouki]

PSA: The latest version of RTSS allows you to use Reflex in every DX11 and DX12 game and limit FPS using the Reflex limiter rather than the normal RTSS limiter:

https://forums.guru3d.com/threads/msi-a ... st-6172420

Added new framerate limiting mode : NVIDIA Reflex mode. In this mode RivaTuner Statistics Server completely disables its own precise framepacing implementation and uses NVIDIA's own framerate limiter instead. This mode is mainly intended to be used in conjunction with DLSS Frame Generation, which is generally not compatible with any third party framerate limiters. However you can also use this mode in the games with no native NVIDIA Reflex support, because enabling NVIDIA Reflex framerate limiter in such titles will also enable Reflex low-latency mode as a side effect. Please take a note that NVIDIA Reflex framerate limiting mode is currently supported on NVIDIA GPUs and in Direct3D11/Direct3D12 applications only. If you try to enable it on unsupported hardware on in unsupported applications, RivaTuner Statistics Server will fall back to default async framerate limiting mode.

Maybe it's just me and I read this before, but what game offers FrameGen but not Reflex?

How useful is this, precisely?

[RealNC]

How useful is this, precisely?

From how I understood it, it means you can enable Reflex in all DX11 and DX12 games. FrameGen is not required. The games might even be 10 years old where neither FrameGen nor Relfex existed yet.

[marcel151]

So when playing high FPS games: NVIDIA Reflex ON + driver V-SYNC OFF or application controlled.
When playing not high FPS games or FPS < Monitor Hz: NVIDIA Reflex ON + driver V-SYNC ON.

Up to context and what you're trying to accomplish.

I am trying to accomplish to minimize input lag and not having tearing. I can see that you did the test with 60 Hz and having quite significant improvements when not capping your FPS. But what when doing it with a higher refresh rate of e.g. 144 Hz? I think the improvements in terms of latency between V-SYNC (NVCP) ON and OFF while using Reflex would be way less?