r710 pcie slots

DDR5 graphics cards require a PCIe 5.0 slot, which is not available on most DDR4 motherboards that typically have PCIe 3.0 or 4.0 slots.

There's also the fact that different motherboards have differing levels of PCIe 5.0 support, and boards with more PCIe 5.0 slots are more expensive. ...

I know that the Pro has 2 16x slots and 4 8x slots, all PCIe 4, and a 4x PCIe 3 slot for the Apple IO card. I also know that the Mac Pro uses an Expansion Slot Utility to manage two pools of PCIe lanes available.