|Chip form factors||Ceramic Pin Grid Array (CPGA)|
Organic Pin Grid Array (OPGA)
|FSB frequency||200 MT/s, 266 MT/s, 333 MT/s, 400 MT/s|
|Voltage range||1.0–2.05 V|
|Processors||AMD Athlon (650 MHz – 1400 MHz)|
AMD Athlon XP (1500+ – 3200+)
AMD Duron (600 MHz – 1800 MHz)
AMD Sempron (2000+ – 3300+)
AMD Athlon MP (1000 MHz – 3000+)
AMD Geode NX (667 MHz – 2200 MHz)
This article is part of the CPU socket series
Socket A (also known as Socket 462) is the CPU socket used for AMD processors ranging from the Athlon Thunderbird to the Athlon XP/MP 3200+, and AMD budget processors including the Duron and Sempron. Socket A also supports AMD Geode NX embedded processors (derived from the Mobile Athlon XP). The socket is a zero insertion force pin grid array type with 462 pins (nine pins are blocked in the socket to prevent accidental insertion of Socket 370 CPUs, hence the number 462). The front-side bus frequencies supported for the AMD Athlon XP and Sempron are 133 MHz, 166 MHz, and 200 MHz. Socket A supports 32-bit CPUs only.
|Model||Code name||Released||CPU support||FSB/HT (MHz)||Southbridge||Features / Notes|
|AMD-750 chipset||AMD-751||August 1999||Athlon, Duron (Slot A, Socket A), Alpha 21264||100 (FSB)||AMD-756, VIA-VT82C686A||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.
|AMD-760 chipset||AMD-761||Nov 2000||Athlon, Athlon XP, Duron (Socket A), Alpha 21264||133 (FSB)||AMD-766, VIA-VT82C686B||AGP 4×, DDR SDRAM|
In practice third party chipsets were heavily favoured by motherboard manufacturers. Stability problems and compatibility quirks abounded from manufacturers not following chipset designers' guidelines which in turn caused lasting damage to AMD's reputation despite AMD having nothing to do with the poorly realised hardware.
- Support of processor clock-speeds between 600 MHz (Duron) to 2333 MHz (Athlon XP 3200+)
- Double data rate 100, 133, 166 and 200 MHz front-side bus on Duron, XP and Sempron processors, based on the Alpha 21264 EV6 bus.
Initially launched with 100 MHz FSB support in the earliest chipsets it evolved stepwise to faster 200 MHz FSB while maintaining pin compatibility throughout its lifetime. However, clock, timing, BIOS and voltage differences restrict compatibility between older chipsets and later processors.
Socket dimensions are 5.59 cm (5.24 cm without lever) x 6.55 cm or 2.2" (2.06" without lever) x 2.58".
Socket A mechanical load limits
All socket A processors (Athlon, Sempron, Duron and Geode NX) have the following mechanical maximum load limits which should not be exceeded during heatsink assembly, shipping conditions, or standard use. Load above those limits may crack the processor die and make it unusable.
|Die Surface||445 N(100 lbf)||133 N(30 lbf)|
|Die Edge||44 N(10 lbf)||44 N(10 lbf)|
Those load limits are quite small compared to the load limits of Socket 478 processors. Indeed, they were so small that many users ended up with cracked processors while trying to remove or attach heatsinks to their fragile processor core. This made installing non-standard or non-certified heatsink solutions a risky business. OEM aluminium heatsinks typically provided small thermal tolerances so the improper application or absence of a thermal pad or thermal grease, or operation in high room temperatures, could lead to some Socket A CPUs overheating and crashing.
|Wikimedia Commons has media related to Socket A.|
- "AMD-750 Chipset Overview" (PDF). amd.com. Retrieved 2001-08-01. CS1 maint: discouraged parameter (link)
- AMD's Super Bypass - AMD Improves their 750 Chipset : Tom's Hardware
- "CPU Sockets Chart". users.erols.com. Retrieved 2009-04-04. CS1 maint: discouraged parameter (link)
- "CTechnology Evolution". amd.com. Retrieved 2009-04-04. CS1 maint: discouraged parameter (link)
- "AMD Athlon Processor Model 4 Data Sheet" (PDF). amd.com. Archived from the original on April 7, 2005. Retrieved 2001-11-08. CS1 maint: discouraged parameter (link) CS1 maint: unfit URL (link)