Butterfly Riser Cards
2 x PCIe Gen 4.0 x16 slots (x32 link)
Multiple GPUs
4 x PCIe Gen 4.0 x16 slots (x16 link), double-slot GPUs, or
8 x PCIe Gen 4.0 x16 slots (x16 link) with PLX SKU board for single-slot GPUs.
Front Riser Card
1 x PCIe Gen 4.0 x8 slot (x8 link)