Beginning with the 80486 a rectangular socket with 169 pins ultimately became known as Socket 1.
Socket 2 involved 238 pins and was intended to support the Pentium OverDrive CPU.
Socket 3 was the last of the production 80486 sockets. Added the ability to support 3.3 Volt CPUs. 237 pins.
Socket 4 was first Pentium socket and the only one to support 5 Volts. P60 and P66 only.
Socket 5 was for the Pentium 75 to 133Mhz. 320 pins, and the first socket that staggered the pins.
Socket 6 was the last official 486 socket, for the DX4. Using 3.3 Volts and 235 pins.
Socket 7 supported the Pentium 75 up to 500Mhz (K-6). It was the first to incorporate voltage regulation for less than 3.3 Volts. 321 pins.
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