5Pcs PCI Express 16x Slot PCIe x16 164 Pin Sokcet Straddle Mount

Graphics Cards · 5770 supports PCI Express up to x16 · Radeon RX 550 supports PCI Express up to x16 · PCI Express x16 is PCI Express

It's a slot of x16 size but electrically x4 This

pcle x16 slot IPCIE16XD11 is Multiple SFF-8654 x4 to PCIe x16 Slot Expansion with Broadcom MegaRAID 9560-16i, 9560-8i, 9580-8i8e, 9500-16i, 9500-8i,

pcle slot PCIe x16 slot, but that card will receive less bandwidth Similarly, you can insert a PCIe x8 card into a PCIe x4 slot, but it'll only work