Socket 3

This article is about a CPU socket. For the variant of an expansion card socket, see M.2 § Form factors and keying.

Socket 3

Type	ZIF
Chip form factors	PPGA
Contacts	237
FSB protocol	?
FSB frequency	25–83 MT/s
Voltage range	3.3 V and 5 V
Processors	Intel 486 SX, 486 DX, 486 DX2, 486 DX4, 486 OverDrive, Pentium OverDrive AMD Am486 and Am5x86
This article is part of the CPU socket series

Socket 3 was one of the series of CPU Sockets into which various x86 microprocessors were inserted. It was sometimes found alongside a secondary socket designed for a math coprocessor chip, in this case the 487. Socket 3 resulted from Intel's creation of lower voltage microprocessors. An upgrade to Socket 2, it rearranged the pin layout and omitted one pin so that 3.3 V processors could not be plugged into older 5 V only sockets.

Socket 3 was a 237-pin low insertion force (LIF) or zero insertion force (ZIF) 19×19 pin grid array (PGA) socket suitable for the 3.3 V and 5 V, 25–50 MHz Intel 486 SX, 486 DX, 486 DX2, 486 DX4, 486 OverDrive and Pentium OverDrive processors as well as AMD Am486, Am5x86 and Cyrix Cx5x86 processors.

See also

• List of Intel microprocessors
• List of AMD microprocessors