The Socket 7 is an Intel processor socket with 321-pin (a few used 296-pin) holes in 37x37 rows, and ran between 2.5 and 3.5v. It is the first and only socket to support processors from different manufacturers. One of the biggest changes to the Socket 7 socket was not the socket, but the VRM (voltage regulator module) found on any motherboard using this socket. To the right is an illustration of the Socket 7 socket.
Some processors the Socket 7 supported include the Intel Pentium 75 MHz - 233 MHz, AMD K5 - K6, Cyrix6x86, and Cyrix6x86MX P120-P233.