what can you put in a pcie slot-kubet casino
PCIe slots come in different physical configurations: x1, x4, x8, x16, x32 ... So if you put a PCIe 2.0 card in a PCIe 3.0 slot, you’ll get PCIe 2.0 performance.
MSI B450 TOMAHAWK MAX
The MSI B450 Tomahawk ATX motherboard comes with one PCI-Express 3.0 slot with full x16 connectivity for graphics cards as well as a PCI-Express 2.0 x16 slot with x4.
PCI / PCI Express / PCI-X Expansion Slots - Acnodes
If I plug the USB 3.0 expansion card in to the 25W PCI-E slot above the primary GPU 225W PCI-E slot, Windows 10 detects the USB card.