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].

Socket 3 resulted from Intel's creation of lower voltage microprocessors.

An upgrade to Socket 2, it rearranged the pin layout.

[1] 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.