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A CPU socket or CPU slot is a connector on a motherboard that accepts a CPU and forms an electrical interface with it. As of 2007, most desktop and server computers, particularly those based on the Intel x86 architecture, include socketed processors.

Most CPU-sockets interfaces are based on the pin grid array (PGA) architecture, in which short, stiff pins on the underside of the processor package mate with holes in the socket. To minimize the risk of bent pins, zero insertion force (ZIF) sockets allow the processor to be inserted without any resistance, then grip the pins firmly to ensure a reliable contact after a lever is flipped.

As of 2007^[update], land grid array (LGA) sockets are becoming increasingly popular, with several current and upcoming socket designs using this scheme. With LGA sockets, the socket contains pins that make contact with pads or lands on the bottom of the processor package. While not popular for many years, LGAs are not new; the Intel 80286 (introduced ca. 1983) was offered in a ceramic LGA version.

In the late 1990s, many x86 processors fit into slots, rather than sockets. CPU slots are single-edged connectors similar to expansion slots, into which a PCB holding a processor is inserted. Slotted CPU packages offered two advantages: L2 cache memory could be upgraded by installing an additional chip onto the processor PCB, and processor insertion and removal was often easier.

Contents 1 List of sockets and slots 1.1 Early sockets 1.2 AMD 1.2.1 Desktop 1.2.2 Mobile 1.2.3 Server 1.3 Intel 1.3.1 Desktop 1.3.2 Mobile 1.3.3 Server 1.4 Others 2 Notes and References 3 See also 4 External links

[edit] List of sockets and slots

Many socket names containing three-digit numbers represent the number of pins on the processor or socket.

[edit] Early sockets

Prior to Intel's introduction of the proprietary Slot 1 in 1997, CPU sockets were de facto open standards and were often used by multiple manufacturers.^[1]

• DIP socket (40 contacts) - Intel 8086, Intel 8088
• PLCC socket (68 contacts) - Intel 80186^{[2] [3]}
• PLCC socket - Intel 80286
• PLCC socket - Intel 80386
• Socket 1 - 80486
• Socket 2 - 80486
• Socket 3 - 80486 (3.3 V and 5 V) and compatibles
• Socket 4 - Intel Pentium 60/66 MHz
• Socket 5 - Intel Pentium 75-133 MHz; AMD K5; IDT WinChip C6, WinChip 2
• Socket 6 - Designed for the 80486, but little used
• Socket 7 - Intel Pentium, Pentium MMX; AMD K6; some Cyrix CPUs

[edit] AMD

[edit] Desktop

• Super Socket 7 (321 contacts) - AMD K6-2, AMD K6-III; Rise mP6.
• Slot A (242 contacts) - Athlon
• Socket A (also known as "Socket 462", 462-contact PGA) - Athlon, Duron, Athlon XP, Athlon XP-M, Athlon MP, Sempron, and Geode.
• Socket 754 (754-contact PGA) - Athlon 64, Sempron, Turion 64.
• Socket 939 (939-contact PGA) - Athlon 64, Athlon 64 FX, Athlon 64 X2, Opteron 100-series.
• Socket AM2 (940-contact PGA) - Athlon 64, Athlon 64 X2, Athlon 64 FX, Opteron, Sempron and Phenom.
• Socket AM2+ (940-contact PGA) - Athlon 64, Athlon 64 X2, Athlon 64 FX, Opteron, and Phenom.
• Socket AM3 (938-contact PGA)

[edit] Mobile

• Socket 563 (563-contact µ-PGA) - Athlon XP-M.
• Socket 754
• Socket S1 (638-contact PGA)
• Socket FS1 - Fusion.

[edit] Server

• Socket 940 (940-contact PGA) - Opteron (2xx and 8xx Series), Athlon 64 FX.
• Socket A
• Socket F (also known as "Socket 1207") - Opteron (2xxx and 8xxx Series) and Athlon 64 FX processors.
• Socket F+
• Socket FS1 - Fusion.
• Socket G34

[edit] Intel

[edit] Desktop

• Slot 1 (242 contacts) - Celeron, Pentium II, Pentium III
• Socket 370 - Pentium III, Celeron; Cyrix III; VIA C3
• Socket 423 - Pentium 4, Celeron (Willamette core).
• Socket N (also known as Socket 478) - Pentium 4, Celeron, Celeron D, Pentium 4 Extreme Edition, Pentium M (Northwood, Prescott, and Willamette cores).
• Socket T (also known as Socket 775 or LGA 775) - Pentium 4, Pentium D, Celeron D, Pentium Extreme Edition, Core 2 Duo, Core 2 Extreme, Celeron, Xeon 3000 series, Core 2 Quad (Northwood, Prescott, Conroe, Kentsfield, Cedar Mill , Wolfdale and Yorkfield cores).
• Socket B (LGA 1366) - Core i7 (Bloomfield, Nehalem).

[edit] Mobile

• Socket 441 - Atom.
• Socket 479 - Pentium M, Celeron M (Banias and Dothan cores).
• Socket 495 (also known as PPGA-B495) - Mobile P3 (Coppermine), Celeron.
• Socket M - Core Solo, Core Duo, Core 2 Duo (Merom Core, Yohan core).
• Micro-FCBGA - Core 2 Duo, Core Duo, Core Solo, Celeron M, Pentium III, Mobile Celeron
• Socket P - (Merom and Penryn Cores)

[edit] Server

• Socket 8 - Pentium Pro
• Slot 2 - Pentium II Xeon, Pentium III Xeon
• Socket 603 - Xeon (Northwood and Willamette cores)
• Socket 604 - Xeon
• PAC418 - Itanium
• PAC611 - Itanium 2, HP PA-RISC 8800 and 8900
• Socket J (also known as Socket 771 or LGA 771) - Xeon (Woodcrest core)
• Socket N - Dual-Core Xeon LV

[edit] Others

• Socket 463 (also known as Socket NexGen) - NexGen Nx586
• Socket 499 - Alpha 21164
• Slot B - Alpha 21264
• Slotkets - adapters for using socket processors in bus-compatible slot motherboards

[edit] Notes and References

[edit] See also

• List of Intel microprocessors
• List of AMD microprocessors

[edit] External links

Wikimedia Commons has media related to: CPU sockets

• CPU Sockets Chart - A fairly detailed table listing x86 Sockets and associated attributes.
• techPowerUp! CPU Database
• Processor sockets

v • d • e Early CPU sockets DIP • PLCC • Socket 1 • Socket 2 • Socket 3 • Socket 4 • Socket 5 • Socket 6 • Socket 7

v • d • e Intel CPU sockets and slots Desktop sockets Slot 1 • Socket 370 • Socket 423 • Socket 478 • Socket N • Socket T • Socket H • Socket B Mobile sockets Socket 441 • Socket 479 • Socket 495 • Socket M • Socket P Server sockets Socket 8 • Slot 2 • Socket 603 • Socket 604 • PAC418 • PAC611 • Socket J • Socket N • Socket B

v • d • e AMD CPU sockets Desktop sockets Super Socket 7 • Slot A • Socket A • Socket 754 • Socket 939 • Socket 940 • Socket AM2 • Socket F • Socket AM2+ • Socket F+ • Socket AM3 Mobile sockets Socket A • Socket 563 • Socket 754 • Socket S1 • Socket FS1 Server sockets Socket A • Socket 940 • Socket F • Socket F+ • Socket G3 (cancelled) • Socket G34