Select GPU card (or cards) for RT - include, exclude, priority

Hi ppl, in case I mount, for example, 3 different CUDA GPU cards on my PC and I want to use 1 only for viewport work and other 2 just for RT GPU realtime render, is there a way to select which card is excluded for the rendering process?

If your answer will be negative, is it possible to think about a next build fix and in addition to select how much priority (in percentage or in terms of “high”, “medium”, “low”) let to any card?

Thanks a lot!

There is a tool named ocldeviceselect.exe that comes with the V-Ray installation, that allows you to do just that. Just remember you have to restart V-Ray in order the changes to have any effect.