Evaluating moving from Vray 6 to Vray 7

[glennco]

Muhammed_Hamed
Hello Muhammed,
I'm using Vray 6 in Rhino 8, and finally have time to upgrade to Vray 7.
But I'm concerned with this note in the Rhino 7 announcement page:
"Recommended CUDA engine - CUDA is now the default and recommended GPU engine. The GPU engine can still be changed in the advanced settings"
Why is CUDA being recommended over RTX?
Going forward, are we not supposed to use RTX?
I have an RTX 4070 TI OC, RTX is around 15% to 20% faster than CUDA and stable.
Thank you,
Glenn

[Muhammed_Hamed]

Hi Glenn!

Thanks for your post
You could safely upgrade to V-Ray 7 and use the RTX engine, we have no plans of deprecating it.
The reason why we urge people to test the CUDA engine more is that is uses less GPU memory, usually 2-3 GB less depending on the scene. It also allows for CPU+GPU rendering, what we call Hbyrid or XPU
In many scenes, the CUDA engine is as fast as RTX, but if your scenes are faster with the RTX engine please stick to the RTX engine for rendering. That being said, please test the CUDA engine as well with your scenes in V-Ray 7

Best,
Muhammed

[glennco]

Muhammed_Hamed

Muhammed,
Thank you for the fast & informative reply.
I'm glad you clarified about RTX, I will proceed that way with V7.
When I had an 8700k & RTX 2070 I used CUDA GPU & CPU.
With my now 1 year old 7900x & RTX 4070 TI, RTX has been great from initial build.
Especially with Vray system memory for textures & Windows 11 shared memory the 4070's 12GB hasn't caused any problems. With the recent driver memory leak, I was consistently going over 12Gb and I saw as high as 15GB.
With the latest driver, that problem was fixed and back to a normal 8-10GB.
Regards,
Glenn