|Chip form factors
|200 MT/s, 266 MT/s
|AMD Athlon (500–1000 MHz)
|Super Socket 7
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.
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.
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Slot A was superseded by Socket A.
AMD offered official chipsets for the Slot A CPUs. These are included in the table below.
|Features / Notes
|Athlon, Duron (Slot A, Socket A), Alpha 21264
|AGP 2×, SDRAM
Irongate chipset family; early steppings had issues with AGP 2×; drivers often limited support to AGP 1×; later fixed with "super bypass" memory access adjustment.
Third-party chipsets includes a large number of VIA K-series chipsets.
In practice, third-party chipsets were heavily favoured by motherboard manufacturers. Stability problems and compatibility quirks from these chipsets abounded from manufacturers not following chipset designers' guidelines. This caused long-lasting damage to AMD's reputation, despite AMD having nothing to do with the poorly-realised hardware. A similar incident happened with third-party chipsets for Super Socket 7 CPUs.