Knit 1, perl 2......
PCI (Both PCI & PCI-E) have only 1 alignment notch. The 2 sockets are identical. The PCI-E socket is usually black. It is installed in a motherboard BACKWARDS from a PCI socket. This way you can't confuse the 2 boards. Either card will go into either socket, but if it's the wrong card (either way) the monitor connections will point toward the inside of the case. An AGP socket has >2< alignment notches, configured more like this ---- ---- ---- Or if 1 notch, closer to the center of the socket. AGP sockets are slightly shorter than PCI. Please, go to Intel, search support for your board and download the manual, it has full layout diagrams.