I want to bifurcate the x16 from the CPU into x8 for GPU and x2x2x2x2 for NVMe. I haven’t been able to Google any desktop boards able to bifurcate smaller than x4x4x4x4. However, it seems possible on the Zen2 Server I/O die:
“Each CPU has 8 x16 PCIe 4.0 links available which can be split up
among up to 8 devices per PCIe root, as shown above.”
Do you know if the Zen2 desktop I/O die is just a smaller version with only one x16? I want to copy some code from a Zen2 server board that can do x2x2x2x2x2x2x2x2 to enable it on my desktop board.