Expansion Chassis: External PCIe Enclosures & Expansion Cards

Now for the question, I see lots of back panel USB cards for PCIe slots But can you plug that card into a PCI-Ex16 slot AND have it work?

PCI Express expansion slot of industrial computer, PCI Express cards Physical shape, Signal , x1, x4, x8, x16 x1, x1, ◎, ×, ×, × x4, x1, ◎

pcie slot qrelease However, whether you need a PCIe x16 slot depends on usage, such as gaming and graphics-intensive tasks If the motherboard and connected device support the

pciex4 slot In ASUS 「PCIe x16 Slots - 4」