PCIe x8 NIC in PCIe x16 slot

Lenovo Legion Tower 7i Gaming Desktop Computer can i put pcie x4 in x16 slot If you have a board that does not do CrossfireSLI, then sticking a card into another slot will have no bearing on the first You could also get an enthusiast candy stars slot Here is AMD's Crossfire compatibility chart to help you understand which cards will work together in crossfire and yes x16 and x4 will work fine

candy pop 2 slot However, the 2nd PCIe x16 slot works at PCIe x4 if two GPU are connected means the primary PCIe x16 slot gets 16 lanes and I still have 4 lanes