Processor and the socket

Processor sockets are keyed to prevent improper installation. Notice in the picture on the right that both the processor and the socket have two corners without pins. This is to prevent the processor from being installed the wrong way. Modern processor sockets are of ZIF (Zero Insertion Force) design. If the processor is aligned properly with the socket, gravity alone should cause it to drop right in. You should never need to use force to insert a modern processor. Never, never, never.