Whether it is possible to choose the specific GPU devices for rendering in Blender? At least two reasons for this:
- to leave 1 GPU for viewport work
- disable GPUs connected with PCIE(1x) and enable GPUs connected with PCIE(8x)/PCIE(16x) when working in viewport (Cycles Rendered). Enable all GPUs for rendering only.
If it is not possible at this moment then perhaps there is someone interested in write addon for Blender. I can pay for this and I think there are other people interested in participate and co-finance.
My proposal for interface: