GPU rendering terribly slow

[menno_vandijk]

A few weeks ago I noticed this problem but I haven't looked at it because I used the cpu for the last few projects. Now that I want to start a new project I did a simple test to see if thing are working as it should but somehow rendering a scene using the gpu is terribly slow on my system. No matter if I choose CUDA or RTX. Switching to cpu and the scene renders faster.

I am running :
- Vray 6 Update 1 (latest)
- 3Ds Max 2023.3
- Windows 11
- 2x RTX 3090 with driver 528.49 (I get a warning in the log about this but I don't think this is the issue since I also tried other drivers)
- AMD 7950x
- 128 GB ram

In the log I notice a message 'Failed setting device 0 context flags'
Could this have something to do with the slow render times?

I have attached the log screenshot and a simple max file

Re-installed the Nvidia drivers and Vray but no luck yet.
Are there any other ideas to fix this problem?

[vladimir_krastev]

HI, thanks for posting. Have you tried to test you setup with V-Ray Benchmark Tool and compare with the statistics there? I will review your scene and get back to the thread.

[Jiri.Matys]

Try what I have done:

Reinstall your nvidia driver, but not express install but the second one (not sure the name now) and turn on fresh clean install.

When I do that, rendering was fine again.