Maybe I didn’t explain it well but I actually see all 13 GPUs in device manager up and running. Doesn’t that eliminate the pci lanes issue? My previous system wouldn’t boot at all once I surpassed that limitation.

I’ll definitely try suggestion No 2 tomorrow because I’m secretly hoping that it has something to do with virtual memory and paging size.

If that doesn’t work however, I’d go for No 3.

Thanks