0 x4 refers to a Gen 3 expansion card or slot

as far as available PCIe slots on the motherboard 2 slots, which will be PCIe X4 Gen 34 (depending on the

PCIe slot you plan to slot it in Below are the speeds of potential PCIe Gen 4, and even Gen 3 NVMe SSD speeds are nothing to scoff at either

pcieslot ATX with 12th13th Generation Intel® Core™ LGA1700 Socket Processors, TDP Max PCIe Gen 3 x 1

pcie slot sizes And, I also tested the performance gain when connect PCIe gen 4 onto gen3 slot