Connect a low profile x16 PCI Express Card to an x1 slot PCI Express X1 to X16 Low Profile Slot Extension Adapter PCIe x1 to PCIe x16 Slot Extension adapter Provides enhanced compatibility between motherboards and a variety of PCI Express expansion cards PCIe slot extension adapter accommodates low profile x2, x4, x8, x12 or x16 PCI Express cards allowing you to install a PCIe card (x1 x16) in an x1 slot