Question / Help Using Nvenc lowers GPU memory clock

[Mroczny_Gustaw]

Using Nvenc causes for some reason lowering of GPU memory clock.
Its 100% repeatable, enabling recording causes the drop - in my case from 3855mhz to 3005mhz. Stopping recording brings back clock to its high proper value immediately. In game performance impact is noticeable

1. set power management mode to maximum performance in nvidia driver panel
2. run gpu-z in sensor tab
3. start recording with nvenc - it can be black screen. gpu-z shows mem clock dropping

It doesn't happen with shadowplay from geforce experience

Folder below contains few short clips showing normal memory clock in the first second and drop every time nvenc starts recording. Also shadowplay clip without clock drop

https://drive.google.com/drive/folders/0B4C72GXa--vgOUx4dmhHSmx2UU0

 

[Osiris]

That's most likely more of a driver thing, doubt we can do anything about it.

 

[Mroczny_Gustaw]

Any chance @Jim would be able to contact nvidia about this? I have almost no idea about coding so looking at github wont tell me how obs calls nvenc, directly in driver or trough ffmpeg? I could file a ticket at NV but most probably they will tell me to contact you

 

[OG See OH Zee]

There was a setting to override it in Nvidia Inspector. Now I can't find it anymore.

EDIT: Nevermind. You must use 2.1.3.9 on Nvidia Inspector and find 'CUDA - Force P2 State' under Common. Switch that off as it's on by default.

https://ci.appveyor.com/project/Orbmu2k/nvidiaprofileinspector/build/artifacts

 

[Mroczny_Gustaw]

Thank you very much, this is it. There are posts about stutters while using nvenc from time to time and this seems to be solution

 

[Dekk]

Using Nvenc causes for some reason lowering of GPU memory clock.
Its 100% repeatable, enabling recording causes the drop - in my case from 3855mhz to 3005mhz. Stopping recording brings back clock to its high proper value immediately. In game performance impact is noticeable

1. set power management mode to maximum performance in nvidia driver panel
2. run gpu-z in sensor tab
3. start recording with nvenc - it can be black screen. gpu-z shows mem clock dropping

It doesn't happen with shadowplay from geforce experience

Folder below contains few short clips showing normal memory clock in the first second and drop every time nvenc starts recording. Also shadowplay clip without clock drop

https://drive.google.com/drive/folders/0B4C72GXa--vgOUx4dmhHSmx2UU0

how do I do 2 and 3.

 

[Sapiens]

@Dekk Why are you trying to reproduce the issue? Instructions for correcting it are in @OG See OH Zee's post.

 

[Fenrir]

I cannot replicate this on my end.

https://pub.rachni.com/vid/2017-09-08_21-39-04.webm

 

[Mroczny_Gustaw]

I cannot replicate this on my end.
https://pub.rachni.com/vid/2017-09-08_21-39-04.webm

Then maybe pascal 10x0 cards are not affected. My maxwell gtx960 is.

 

[TryHD]

my 1080ti is affected, disabling CUDA - Force P2 State helps though

 

[PrinceVinc]

So there is no way OBS can "send" this command to do the same thing?

Funny enough, someone posted this question in Nvidia Forum:
https://forums.geforce.com/default/...ding-with-obs-causes-gpu-memory-to-downclock/

A Community manager says he looks into it. 2 Years later...nothing...

 

[ynetwork]

It still happens to GTX1070 with the latest Nvidia driver 378.98 and Windows 10 fall creator update (build 16299). If you utilize NVENC in OBS Studio, please monitor your GPU memory clock- you might be getting punished in the performance. Fortunately, you can fix the issue with Nvidia Inspector as OG See OH Zee mentioned above.

 

[ynetwork]

Sadly this trick seems no longer working. 'CUDA - Force P2 State' entry is gone in the 399.07 driver.

 

[CaptaPraelium]

It's there.

 

[ynetwork]

It's there.
View attachment 39177

That's strange. I installed the driver like three times with DDU to make sure that I didn't miss. It seems that the issue is on my side. Really ppreciated for your clarification.

** Confirm : Yes, I was wrong. My inspector vresion(2.1.3) is outdated.