cuda vs rtx - vray gpu

[matteo_speri]

hi, i bought a rtx 3080 ti.
I ran the vray benchmark,
my current configuration is:
2x 1080 ti pascal (11gb)
1x 3080 ti rtx (12gb)
the benchmark score is:
cuda version 3171
rtx version 2506
Is there any benefit (I use vray gpu) to use the rtx mode only or, according to the score, should I stay in cuda mode? I will replace the two 1080ti cards in the next few months
thanks
Matteo

[Muhammed_Hamed]

Hello matteo_speri

In your case here it is best to stick to RTX mode, so V-Ray will be able to use dedicated ray-tracing hardware on your 3080ti to speed up your renderings
The 3080ti is much faster than your other 2 GPUs, I recommend to remove 1x 1080ti from this machine and keep 1x 1080ti + 1x 3080ti
This way you will be able to have some spacing between the 2 GPUs, and they will run quieter and cooler, and they will boost frequencies higher

In this case here you can use your 1080ti for Display/Viewport performance, to do that go to Nvidia Control panel, select Manage 3D settings, and look for "OpenGL rendering GPU
By default this option is set to Auto-select, change it to your 1080ti



This way Maya, Max and all other applications will only use your 1080ti for viewport performance. And you will be able to dedicate your 3080ti to your GPU rendering, you will be able to access all available VRAM on your 3080ti here which is great!
in V-Ray device selection, make sure to uncheck your 1080ti when using RTX mode.
In the screenshot above I have a 3090 for rendering, and 3060 for OpenGL and display. It is a great setup for GPU rendering

And one more tip, make sure the 1080ti is installed in the first PCIe slot in your Motherboard, and having all your monitors connected to it
Then having the 3080ti in a lower PCIe slot, so the fans get access to fresh air

Best,
Muhammed

[matteo_speri]

Hi Muhammed,
thanks for the advice, i just set up as you said and i will do some tests.
So I can now also use vantage, I'm very curious
Thanks
Matteo