Specifications

Computer Architecture and Maintenance (G-Scheme-2014)
moved to incorporate L2 cache on-die, and the low-cost Duron was manufactured
only in an on-die cache version, there was no longer a need for the expensive cartridge
packaging the original Athlon processors used.
Socket A has 462 pins and 11 plugs oriented in an SPGA form (see Figure). Socket A
has the same physical dimensions and layout as Socket 370; however, the location and
placement of the plugs prevent Socket 370 processors from being inserted. Socket A
supports 31 voltage levels from 1.100V to 1.850V in 0.025V increments, controlled by
the VID0-VID4 pins on the processor. The automatic
voltage regulator module circuitry typically is embedded
on the motherboard.
Figure. Socket A (Socket 462) Athlon/Duron layout.
There are 11 total plugged holes, including 2 of the
outside pin holes at A1 and AN1. These are used to allow for keying to force the proper
orientation of the processor in the socket. The pinout of Socket A is shown in Figure.
Figure. Socket A (Socket 462) Athlon/Duron pinout (top view).
After the introduction of Socket A, AMD moved all Athlon (including all Athlon XP)
processors to this form factor, phasing out Slot A. In addition, for a time AMD also sold
a reduced L2 cache version of the Athlon called the Duron in this form factor. In 2005,
AMD discontinued the Athlon XP and introduced the AMD Sempron in both Socket A
and Socket 754 form factors. The first Athlon 64 processors also used Socket 754, but
most current Athlon 64 processors now use Socket 939.
Caution
Just because a chip can plug into a socket doesn't mean it will work. The newer Athlon
XP and Socket A Sempron processors require different voltages, BIOS, and chipset
support than earlier Socket A Athlon and Duron processors. As always, make sure
your motherboard supports the processor you intend to install.
Prepared By – Prof. Manoj.kavedia (9860174297 – 9324258878 ) (www.kavediasir.yolasite.com)
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