Socket 3
{{About|a CPU socket|the variant of an expansion card socket|M.2#KEYING{{!}}M.2 § Form factors and keying}}
{{short description|Series of CPU sockets}}
{{Infobox CPU socket
|name = Socket 3
|image = 250px
|formfactors = PPGA
|contacts = 237
|type = ZIF
|protocol = ?
|fsb = 25–50 MT/s
|voltage = 3.3 V and 5 V
|processors = Intel 486 SX, 486 DX, 486 DX2, 486 DX4, 486 OverDrive, Pentium OverDrive
AMD Am486 and Am5x86
|predecessor = Socket 2
}}
Socket 3 was a series of CPU sockets for various x86 microprocessors. It was sometimes found alongside a secondary socket designed for a math coprocessor chip, such as the 487{{Citation needed|date=November 2021}}. Socket 3 resulted from Intel's creation of lower voltage microprocessors. An upgrade to Socket 2, it rearranged the pin layout. Socket 3 is compatible with 168-pin socket CPUs.{{Cite web|date=17 June 2021|title=Intel CPUs|url=https://www.vogonswiki.com/index.php/Intel_CPUs#Socket_1.2C2.2C3}}
Socket 3 was a 237-pin 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.{{Citation |title=Intel Socket 3 Specification |publisher=pcguide.com |url=http://www.pcguide.com/ref/cpu/char/socketSocket3-c.html |accessdate=2009-03-30}}