CPU socket

A CPU socket or CPU slot is a mechanical component that provides mechanical and electrical connections between a microprocessor and a printed circuit board (PCB). This allows the CPU to be replaced without soldering.

Common sockets have retention clips that apply a constant force, which must be overcome when a device is inserted. For chips with a large number of pins, either zero-insertion force (ZIF) sockets or land grid array (LGA) sockets are used instead. These designs apply a compression force once either a handle (for ZIF type) or a surface plate (LGA type) is put into place. This provides superior mechanical retention while avoiding the risk of bending pins when inserting the chip into the socket.

CPU sockets are used in desktop and server computers. As they allow easy swapping of components, they are also used for prototyping new circuits.Laptops typically use surface mount CPUs, which need less space than a socketed part.

Contents 1 Function 2 List of sockets and slots 3 Slotkets 4 Notes and references 5 See also 6 External links

Function

A CPU socket is made of plastic, a metal lever or latch, and metal contacts for each of the pins or lands on the CPU. Many packages are keyed to ensure the proper insertion of the CPU. CPUs with a PGA package are inserted into the socket and the latch is closed.

List of sockets and slots

Socket name	Year of introduction	Year of End Of Life	CPU families	Package	Pin count	Pin pitch	Bus speed	Notes
DIP	1970s	Still available	Intel 8086 Intel 8088	DIP	40	2.54mm	5/10 MHz
PLCC	?	Still available	Intel 80186 Intel 80286 Intel 80386	PLCC	68, 132	1.27mm	6–40 MHz
Socket 1	1989	?	Intel 80486	PGA	169	?	16–50 MHz
Socket 2	?	?	Intel 80486	PGA	238	?	16–50 MHz
Socket 3	1991	?	Intel 80486	PGA	237	?	16–50 MHz
Socket 4	?	?	Intel Pentium	PGA	273	?	60–66 MHz
Socket 5	?	?	Intel Pentium AMD K5 IDT WinChip C6 IDT WinChip 2	PGA	320	?	50–66 MHz
Socket 6	?	?	Intel 80486	PGA	235	?	?
Socket 7	1994	?	Intel Pentium Intel Pentium MMX AMD K6	PGA	321	?	50–66 MHz
Super Socket 7	1998	?	AMD K6-2 AMD K6-III Rise mP6 Cyrix MII	PGA	321	?	66–100 MHz
Socket 8	1995	?	Intel Pentium Pro	PGA	387	?	60–66 MHz
Slot 1	1997	?	Intel Pentium II Intel Pentium III	Slot	242	?	66–133 MHz	Celeron (Covington, Mendocino) Pentium II (Klamath) Pentium III (Katmai)- all versions Pentium III (coppermine)
Slot 2	1998	?	Intel Pentium II Xeon	Slot	330	?	100–133 MHz
Socket 463/ Socket NexGen	?	?	NexGen Nx586	PGA	463	?	?
Socket 499	?	?	Alpha 21164A	Slot	587	?	?
Slot A	1999	?	AMD Athlon	Slot	242	?	100 MHz
Slot B	?	?	Alpha 21264	Slot	587	?	?
Socket 370	1999	?	Intel Pentium III Intel Celeron VIA Cyrix III VIA C3	PGA	370	1.27mm[1]	66–133 MHz
Socket 462/ Socket A	2000	?	AMD Athlon AMD Duron AMD Athlon XP AMD Athlon XP-M AMD Athlon MP AMD Sempron	PGA	462	?	100–200 MHz This is a double data rate bus having a 400 MT/s (megatransfers/second) fsb in the later models
Socket 423	2000	?	Intel Pentium 4	PGA	423	1mm[2]	400 MT/s (100 MHz)	Willamette core only
Socket 478/ Socket N	2000	?	Intel Pentium 4 Intel Celeron Intel Pentium 4 EE Intel Pentium 4 M	PGA	478	1.27mm[3]	400–800 MT/s (100–200 MHz)
Socket 495	2000	?	Intel Celeron	PGA	495	1.27mm[4]	?
PAC418	2001	?	Intel Itanium	PGA	418	?	133 MHz
Socket 603	2001	?	Intel Xeon	PGA	603	1.27mm[5]	400–533 MT/s (100–133 MHz)
PAC611	2002	?	Intel Itanium 2 HP PA-8800, PA-8900	PGA	611	?	?
Socket 604	2002	?	Intel Xeon	PGA	604	1.27mm[5]	400–1066 MT/s (100–266 MHz)
Socket 754	2003	?	AMD Athlon 64 AMD Sempron AMD Turion 64	PGA	754	1.27mm[6]	200–800 MHz
Socket 940	2003	?	AMD Opteron Athlon 64 FX	PGA	940	1.27mm[7]	200–1000 MHz
Socket 479	2003	?	Intel Pentium M Intel Celeron M	PGA	479[8]	?	400–533 MT/s (100–133 MHz)
Socket 939	2004	11/2008	AMD Athlon 64 AMD Athlon 64 FX AMD Athlon 64 X2 AMD Opteron	PGA	939	1.27mm[7]	200–1000 MHz	Support of Athlon 64 FX to 1 GHz Support of Opteron limited to 100-series only
LGA 775/ Socket T	2004	?	Intel Pentium 4 Intel Pentium D Intel Celeron Intel Celeron D Intel Pentium XE Intel Core 2 Duo Intel Core 2 Quad Intel Xeon	LGA	775	1.09mm x 1.17mm[9]	1600 MHz
Socket 563	?	?	AMD Athlon XP-M	PGA	563	?	?
Socket M	2006	?	Intel Core Solo Intel Core Duo Intel Dual-Core Xeon Intel Core 2 Duo	PGA	478	?	533–667 MT/s (133–166 MHz)	For notebook platform Replaces Socket 479
LGA 771/ Socket J	2006	?	Intel Xeon	LGA	771	1.09mm x 1.17mm[10]	1600 MHz
Socket S1	2006	?	AMD Turion 64 X2	PGA	638	1.27mm[11]	200–800 MHz
Socket AM2	2006	?	AMD Athlon 64 AMD Athlon 64 X2	PGA	940	1.27mm[7]	200–1000 MHz	Replaces Socket 754 and Socket 939
Socket F	2006	?	AMD Athlon 64 FX AMD Opteron	LGA	1207	1.1mm[12]	?	Replaces Socket 940
Socket AM2+	2007	?	AMD Athlon 64 AMD Athlon X2 AMD Phenom AMD Phenom II	PGA	940	1.27mm[7]	200–2600 MHz	Separated power planes Replaces Socket AM2 AM2+ Pkg. CPUs can work in Socket AM2 AM2 Pkg. CPUs can work in Socket AM2+
Socket P	2007	?	Intel Core 2	PGA	478		533–1066 MT/s (133–266 MHz)	For notebook platform Replaces Socket M
Socket 441	2008	?	Intel Atom	PGA	441	?	400–667 MHz
LGA 1366/ Socket B	2008	?	Intel Core i7 (900 series) Intel Xeon (35xx, 36xx, 55xx, 56xx series)	LGA	1366		4.8-6.4 GT/s	Replaces server-oriented Socket J (LGA 771) in the entry level.
rPGA 988A / B/ Socket G1 / G2	2008	?	Intel Core i7 (600, 700, 800, 900 series) Intel Core i5 (400, 500 series) Intel Core i3 (300 series) Intel Pentium (P6000 series) Intel Celeron (P4000 series)	rPGA	988	1mm	2.5GT/s, 4.8GT/s	For notebook platform
Socket AM3	2009	?	AMD Phenom II AMD Athlon II AMD Sempron	PGA	941[13]	1.27mm[7]	200–3200 MHz	Separated power planes Replaces Socket AM2+ AM3 Pkg. CPUs can work in Socket AM2/AM2+ Sempron 140 Only
LGA 1156/ Socket H	2009	?	Intel Core i7 (800 series) Intel Core i5 (700, 600 series) Intel Core i3 (500 series) Intel Xeon (X3400, L3400 series) Intel Pentium (G6000 series) Intel Celeron (G1000 series)	LGA	1156	?	2.5 GT/s	DMI bus is a (perhaps modified) PCI-E x4 v1.1 interface
Socket G34	2010	?	AMD Opteron (6000 series)	LGA	1974	?	200–3200 MHz	Replaces Socket F
Socket C32	2010	?	AMD Opteron (4000 series)	LGA	1207	?	200–3200 MHz	Replaces Socket F, Socket AM3
LGA 1248	2010	?	Intel Intel Itanium 9300-series	LGA	1248	?	4.8 GT/s
LGA 1567	2010	?	Intel Intel Xeon 6500/7500-series	LGA	1567	?	4.8-6.4 GT/s
LGA 1155/ Socket H2	2011/Q1	?	Intel Sandy Bridge-DT	LGA	1155	?	5 GT/s	Supports 20 PCI-E 2.0 lanes.
LGA 2011/ Socket R	2011/Q3	?	Intel Sandy Bridge B2	LGA	2011	?	4.8-6.4 GT/s	Supports 40 PCI-E 3.0 lanes.
Socket FM1	2011	?	AMD Llano Processor	PGA	905	1.27mm
Socket name	Year of introduction	Year of EOL	CPU families	Package	Pin count	Pin pitch	Bus speed	Notes

Slotkets

Slotkets are special adapters for using socket processors in bus-compatible slot motherboards.

Notes and references

See also

• List of microprocessors
• List of Intel microprocessors
• List of AMD microprocessors

External links

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

Early CPU sockets Other packages DIP • PLCC PGAs Socket 1 • Socket 2 • Socket 3 • Socket 4 • Socket 5 • Socket 6 • Socket 7

Intel CPU sockets and slots Desktop sockets Slot 1 Socket 370 Socket 423 Socket 478 LGA 775 LGA 1366 LGA 1156 LGA 1155 LGA 2011 LGA 1150 Mobile sockets Socket 441 Socket 479 Socket 495 Socket M Socket P Socket G1 Socket G2 Server sockets Socket 8 Slot 2 Socket 603 Socket 604 PAC418 PAC611 LGA 771 LGA 1366 LGA 1156 LGA 1155 LGA 1356 LGA 1248 LGA 1567 LGA 2011 Legacy non-proprietary sockets Socket 1 Socket 2 Socket 3 Socket 4 Socket 5 Socket 6 Socket 7

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 AM3 Socket AM3+ Socket FM1 Socket FM2 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 Socket C32