What is the difference between PCIe Gen 3 and PCIe Gen 4?

List of Motherboards with 4 PCI-Express x16 Slots: ASUS Pro WS TRX50-SAGE WIFI, GIGABYTE A620M C, GIGABYTE B650M C V2, ASUS Prime B760M-A AX, GIGABYTE B760M

x4, x8 and x16 You'll be able to do more with less in this case, since a PCIe x8 slot can handle almost exactly what a PCIe x16 slot

pcie x1 slot function PCI Express to 4 Slot PCI Expansion System Product ID: PEX2PCI4 's innovative PCI Express to PCI Expansion Chassis provides a quick and simple

pcie 20 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,