The riser slots on the motherboard are physically capable of accepting any PCI or PCIe* card.
Do not insert a PCIe or other add-in card directly into the motherboard; doing so can permanently damage the board, and will void the warranty. The slots on the motherboard are only intended for the riser assembly that comes included with the system.
Only plug PCIe or other add-in cards into the risers that ship with the systems.
This applies to: