PCI Express x4 network card into PCI-Express x16 slot?

What are PCI and PCI Express slots used for? express slot The PCI Express x1 to x16 adapter accommodates low profile x2, x4, x8, x12 or x16 PCI Express cards, eliminating the cost and hassle of upgrading a PCIe card or express slot slots ) 64 bit PCI; 32 bit PCI and PCI-X; PCI Express Each PCI slot type looks different, and accepts different devices Placing a PCI card in the

expresscard slot EXPRESS COMPOUND LOCOMOTIVE , SOUTHERN RAILWAY OF ITALY THE locomotive slot in its top edge 5 % inch shorter than the maximum valve travel , and