HBA pcie x8 card on pcie x4

A PCIe x1 adapter can fit in an x1 or higher slot A larger card, such as a PCIe x16, cannot fit in a lower-numbered slot

Each lane in PCIe has a transfer rate of 5 gigatransfers per second Therefore, PCIe x8 has a total bandwidth of 40 GTs (8 lanes

pcie 20 x16 slot if the slot is open like that, you should be good to go if it's not open, you could a) use another riser to adapt the x8 to x16, or b)

pcie m2 slot A PCIe slot that supports a PCIe x8 card also supports a PCIe x4 or x2 card All slots support PCIe cards of up to 75 W The power of a PCIe