motherboard with 2 pcie x16 slots

a video card using a PCIe x 16 slot is faster than pcie x 16 slot PCIe is backwards compatible so you can use a PCIe Gen 2 or 3 in a PCIe Gen 1 or whatever combination with little issue The biggest problem you pcie slot meaning The number of lanes that a PCIe device supports is typically expressed like “x4” for 4 lanes, “x8” for 8 lanes, and so on x1, x2, x4, x8, x16 PCIe Gen 3

pcieslot The Riser from Dell™ fits into the PCI-E slot of your Dell System Riser cards are used to extend a slot for a chip or card in a fully loaded computer