Pciex16 vs x8 vs x4 - Gaming test

What is PCIe x4 Slot pcie x4 in x16 slot Have you ever thought if you can plug PCI Express cards into x16 lane slot? In this video pcie4 slot 1 PCIe x16 slot; 4 SATA3, 2 x ; Graphics Output Options: HDMI & Display ; 1 Rear USB Gen2x2 Type-C, 1 Rear USB Gen2 Type-A

pciex16 slot It'll have all 16 if you don't use the second slot but it makes no difference Even a 1080 shows no performance difference at x8