Slot A

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Slot A
Chip form factorsPGA
FSB protocolEV6
FSB frequency200 MT/s, 266 MT/s
Voltage range1.3–2.05 V
ProcessorsAMD Athlon (500–1000 MHz)
PredecessorSuper Socket 7
SuccessorSocket A

This article is part of the CPU socket series

Slot A is the physical and electrical specification for a 242-lead single-edge-connector used by early versions of AMD's Athlon processor.[1]

The Slot A connector allows for a higher bus rate than Socket 7 or Super Socket 7. Slot A motherboards use the EV6 bus protocol, a technology originally developed by Digital Equipment Corporation (DEC) for its Alpha 21264 microprocessor.

A Slot A CPU on the left compared to a Slot 1 CPU (connector rotated by 180 degrees)

Slot A is mechanically compatible but electrically incompatible with Intel's Slot 1. As a consequence, Slot A motherboards were designed to have the connector's installed orientation be rotated 180 degrees relative to Slot 1 motherboards to discourage accidental insertion of a Slot 1 processor into a Slot A motherboard, and vice versa. The choice to use the same mechanical connector as the Intel Slot 1 also allowed motherboard manufacturers to keep costs down by stocking the same part for both Slot 1 and Slot A assemblies.

Slot A was superseded by Socket A.

See also[edit]


  1. ^ "CPU Sockets Chart". Retrieved 2009-04-04.