Riser with Two PCIe Gen3 FH slots One x8 and 1 x16

John_M If you're just using your GPU for mining, four PCIe lanes is more than enough Motherboards designed specifically for mining have only

So using the cards on PCI should be perfectly fine, I plan on using it as well Additionally, I also found benchmarks comparing RTX 3080 on

pcie expansion slot , PCI Express x1 and PCI Express x16 It is clear that the PCI Express x16 adapter will not physically fit in the PCI x1 slot PCI and PCI Express

pcie slot pinout PCIe and has a free PCIe x16 slot If your motherboard only supports PCIe , the card will only work up to that supported speed (