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CPU socket

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From Wikipedia, the free encyclopedia

Circuit board-microprocessor connection

Incomputer hardware, aCPU socket orCPU slot contains one or more mechanical components providing mechanical and electrical connections between amicroprocessor and aprinted circuit board (PCB). This allows for placing and replacing thecentral processing unit (CPU) without soldering.

Common sockets have retention clips that apply a constant force, which must be overcome when a device is inserted. For chips with many pins,zero insertion force (ZIF) sockets are preferred. Common sockets includepin grid array (PGA) orland grid array (LGA). These designs apply acompression force once either a handle (PGA type) or a surface plate (LGA type) is put into place. This provides superior mechanical retention while avoiding the risk of bendingpins when inserting the chip into the socket.

CPU sockets are used on themotherboard indesktop andserver computers. Because they allow easy swapping of components, they are also used for prototyping new circuits.Laptops typically usesurface-mount CPUs, which take up less space on the motherboard than a socketed part.

As the pin density increases in modern sockets, increasing demands are placed on theprinted circuit board fabrication technique, which permits the large number of signals to be successfully routed to nearby components. Likewise, within thechip carrier, thewire bonding technology also becomes more demanding with increasing pin counts and pin densities. Each socket technology will have specificreflow soldering requirements. As CPU and memory frequencies increase, above 30 MHz or thereabouts, electrical signalling increasingly shifts todifferential signaling over parallel buses, bringing a new set ofsignal integrity challenges. The evolution of the CPU socket amounts to a coevolution of all these technologies in tandem.

Modern CPU sockets are almost always designed in conjunction with aheat sink mounting system, or, in lower power devices, other thermal considerations.

Function

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A CPU socket is made of plastic, and often comes with a lever or latch, and with 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 aPGA (pin grid array) package are inserted into the socket and, if included, the latch is closed. CPUs with anLGA (land grid array) package are inserted into the socket, the latch plate is flipped into position atop the CPU, and the lever is lowered and locked into place, pressing the CPU's contacts firmly against the socket's lands and ensuring a good connection, as well as increased mechanical stability.

List

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80x86

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Table legend:

Intel only

AMD only

Socket name	Year of introduction	CPU families supported	Computer type	Package	Pin count	Pin pitch (mm)	Busclock & transfers	Notes
DIP	1970s	Intel 8086 Intel8088		DIP	40	2.54	5/10 MHz
PLCC	1982	Intel80186 Intel80286 Intel80386		PLCC	68 to 132	1.27	6–40 MHz	1982 for this use
PGA68	1982	Intel 80286		PGA	68
PGA132	1985	Intel 80386		PGA	132
PGA168	1989	Intel80486 AMD 486 Cyrix 486		PGA	168	2.54	16–50 MHz	Sometimes referred to as Socket 0 or Socket 486
Socket 1	1989	Intel 80486 AMD 486 AMD 5x86 Cyrix 486 Cyrix 5x86		PGA	169	2.54	16–50 MHz
Socket 2	1990s	Intel 80486 IntelPentium OverDrive (P24T) Intel DX4 AMD 486 AMD 5x86 Cyrix 486 Cyrix 5x86		PGA	238	2.54	16–50 MHz
Socket 3	1991	Intel 80486 Intel Pentium OverDrive (P24T) Intel DX4 AMD 486 AMD 5x86 Cyrix 486 Cyrix 5x86 IBM Blue Lightning		PGA	237	2.54	16–50 MHz^[a]
Socket 4	1993	IntelPentium		PGA	273	?	60–100 MHz
Socket 5	1994	Intel Pentium AMD K5 Cyrix 6x86 IDT WinChip C6 IDT WinChip 2		PGA	320	?	50–100 MHz
Socket 6	?	Intel 80486		PGA	235	?	?	Designed but not used
Socket 463/ Socket NexGen	1994	NexGen Nx586		PGA	463	?	37.5–66 MHz
Socket 7	1995	Intel Pentium IntelPentium MMX AMDK6		PGA	321	?	50–66 MHz	It is possible to use Socket 7 processors in a Socket 5. An adapter is required, or if one is careful, a socket 7 can be pulled off its pins and put onto a socket 5 board, allowing the use of socket 7 processors.
Socket 8	1995	IntelPentium Pro		PGA	387	?	60–66 MHz
Slot 1	1997	IntelPentium II IntelPentium III	Desktop	Slot	242	?	66–133 MHz	Celeron (Covington, Mendocino) Pentium II (Klamath, Deschutes) Pentium III (Katmai)- all versions Pentium III (coppermine)
Super Socket 7	1998	AMDK6-2 AMDK6-III Rise mP6 CyrixMII		PGA	321	?	66–100 MHz	Backward compatible with Socket 5 and Socket 7 processors.
Slot 2	1998	IntelPentium II Xeon IntelPentium III Xeon	Server	Slot	330	?	100–133 MHz
Socket 615	1999	IntelMobile Pentium II IntelMobile Celeron	Notebook	PGA	615	?	66 MHz
Slot A	1999	AMDAthlon	Desktop	Slot	242	?	100 MHz
Socket 370	1999	Intel Pentium III IntelCeleron VIA Cyrix III VIAC3	Desktop	PGA	370	1.27^[1]	66–133 MHz
Socket A/ Socket 462	2000	AMD Athlon AMDDuron AMDAthlon XP AMDAthlon XP-M AMDAthlon MP AMDSempron	Desktop	PGA	462	?	100–200 MHz 400 MT/s^[b]
Socket 423	2000	IntelPentium 4	Desktop	PGA	423	1^[2]	100 MHz 400 MT/s	Willamette core only. Can accept some of Socket 478 CPU with an adapter
Socket 495	2000	Intel Celeron Intel Pentium III	Notebook	PGA	495	1.27^[3]	66–133 MHz
Socket 603	2001	IntelXeon	Server	PGA	603	1.27^[4]	100–133 MHz 400–533 MT/s
Socket 478/ Socket N	2001	Intel Pentium 4 Intel Celeron IntelPentium 4 EE IntelPentium 4 M	Desktop	PGA	478	1.27^[5]	100–200 MHz 400–800 MT/s
Socket 563	2002	AMD Athlon XP-M	Notebook	PGA	563	?	333 MHz
Socket 604	2002	Intel Xeon	Server	PGA	604	1.27^[4]	100–266 MHz 400–1066 MT/s
Socket 754	2003	AMDAthlon 64 AMD Sempron AMDTurion 64	Desktop	PGA	754	1.27^[6]	200–800 MHz
Socket 940	2003	AMDOpteron AMDAthlon 64 FX	Desktop Server	PGA	940	1.27^[7]	200–1000 MHz
Socket 479	2003	IntelPentium M IntelCeleron M	Notebook	PGA	479^[8]	?	100–133 MHz 400–533 MT/s
Socket 939	2004	AMD Athlon 64 AMD Athlon 64 FX AMDAthlon 64 X2 AMD Opteron	Desktop	PGA	939	1.27^[9]	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 IntelPentium D Intel Celeron IntelCeleron D IntelPentium XE IntelCore 2 Duo IntelCore 2 Quad Intel Xeon	Desktop	LGA	775	1.09 x 1.17^[10]	1600 MHz	Can accept LGA 771 CPU with slight modification and use of an adapter
Socket M	2006	IntelCore Solo IntelCore Duo Intel Dual-Core Xeon Intel Core 2 Duo	Notebook	PGA	478	?	133–166 MHz 533–667 MT/s	Replaces Socket 479
LGA 771/ Socket J	2006	Intel Xeon	Server	LGA	771	1.09 x 1.17^[11]	1600 MHz	See LGA 775/Socket T above
Socket S1	2006	AMDTurion 64 X2	Notebook	PGA	638	1.27^[12]	200–800 MHz
Socket AM2	2006	AMD Athlon 64 AMD Athlon 64 X2	Desktop	PGA	940	1.27^[9]	200–1000 MHz	Replaces Socket 754 and Socket 939
Socket F/ Socket L (Socket 1207FX)	2006	AMD Athlon 64 FX AMD Opteron (Socket L only support Athlon 64 FX)	Desktop Server	LGA	1207	1.1^[13]	Socket L: 1000 MHz in Single CPU mode, 2000 MHz in Dual CPU mode	Replaces Socket 940 Socket L was intended for enthusiasts who wanted server power in a desktop PC. It is just a re-branded Socket F that doesn't need special RAM, and may have only been used in the Asus L1N64-SLI WS Motherboard.
Socket AM2+	2007	AMD Athlon 64 AMDAthlon X2 AMDPhenom AMDPhenom II	Desktop	PGA	940	1.27^[9]	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	IntelCore 2	Notebook	PGA	478	?	133–266 MHz 533–1066 MT/s	Replaces Socket M
LGA 1366/ Socket B	2008	IntelCore i7 (900 series) Intel Xeon (35xx, 36xx, 55xx, 56xx series)	Desktop Server	LGA	1366	?	4.8–6.4 GT/s	Replaces Socket J (LGA 771) in the entry level.
Socket AM3	2009	AMD Phenom II AMDAthlon II AMD Sempron AMD Opteron (1300 series)	Desktop	PGA	941^[14]^[15]	1.27^[9]	200–3200 MHz	Separated power planes Replaces Socket AM2+ AM3 Pkg. CPUs can work in Socket AM2/AM2+ Sempron 140 only
rPGA 988A/ Socket G1	2009	IntelClarksfield IntelArrandale	Notebook	rPGA	988	1	2.5 GT/s	Replaces Socket P
LGA 1156/ Socket H	2009	IntelNehalem (1st gen) IntelWestmere	Desktop	LGA	1156	?	2.5 GT/s	DMI bus is a (perhaps modified)PCIe x4 v1.1 interface
Socket G34	2010	AMD Opteron (6000 series)	Server	LGA	1974	?	200–3200 MHz	Replaces Socket F
Socket C32	2010	AMD Opteron (4000 series)	Server	LGA	1207	?	200–3200 MHz	Replaces Socket F, Socket AM3
LGA 1567/ Socket LS	2010	IntelXeon 6500/7500-series	Server	LGA	1567	?	4.8–6.4 GT/s
LGA 1155/ Socket H2	2011/Q1 2011.01.09	IntelSandy Bridge (2nd gen) IntelIvy Bridge (3rd gen)	Desktop	LGA	1155	?	5.7 GT/s	used for Intel 2nd generation, 3rd generation processors. Sandy Bridge supports 20 PCIe 2.0 lanes. Ivy Bridge supports 40 PCIe 3.0 lanes. Intel Mainstream Socket.
LGA 2011/ Socket R	2011/Q3 2011.11.14	Intel Core i7 3xxxSandy Bridge-E Intel Core i7 4xxxIvy Bridge-E Intel Xeon E5 2xxx/4xxx (Sandy Bridge EP) (2/4S) Intel Xeon E5-2xxx/4xxx v2 (Ivy Bridge EP) (2/4S)	Desktop Server	LGA	2011	?	4.8–6.4 GT/s	Sandy Bridge-E/EP and Ivy Bridge-E/EP both support 40 PCIe 3.0 lanes. Using the Xeon focused 2011 socket gives also 4 memory Channels.
rPGA 988B/ Socket G2	2011	Intel Core i7 IntelCore i5 IntelCore i3 (2000, 3000 series)	Notebook	rPGA	988	1	2.5 GT/s, 4.8 GT/s
Socket FM1	2011	AMDLlano Processors	Desktop	PGA	905	1.27	5.2 GT/s	used for 1st generation APUs
Socket FS1	2011	AMD Llano Processors	Notebook	PGA	722	1.27	3.2 GT/s	used for 1st generation Mobile APUs
Socket AM3+	2011	AMDFX Vishera^{[broken anchor]} AMDFX Zambezi AMD Phenom II AMDAthlon II AMD Sempron	Desktop	PGA	942 (CPU 71pin)	1.27	3.2 GT/s
LGA 1356/ Socket B2	2012	Intel Xeon (E5 1400 & 2400 series)	Server	LGA	1356	?	3.2–4.0 GT/s
Socket FM2	2012	AMDTrinity Processors	Desktop	PGA	904	1.27	?	used for 2nd generation APUs
LGA 1150/ Socket H3	2013	IntelHaswell (4th gen) IntelHaswell Refresh IntelBroadwell (5th gen)	Desktop	LGA	1150	?	?	used for Intel's 4th generation (Haswell/Haswell Refresh), the handful of intel 5th generation processors
rPGA 946B/947/ Socket G3	2013	IntelHaswell	Notebook	rPGA	946	1	5.0 GT/s
Socket FM2+	2014	AMDKaveri AMDGodavari	Desktop	PGA	906	1.27	?	Compatible withAMD APUs such as "Richland" and "Trinity"
Socket AM1	2014	AMD Athlon AMD Sempron	Desktop	PGA	721	1.27	?	Compatible with AMD APUs such as "Kabini"
LGA 2011-v3	2014 (August and September)	Haswell-E Haswell-EP	Desktop	LGA	2011	?	Up to 68 GB/sec. Depends on DDR4 speed and channel count.	Up to 40 PCIe 3.0 lanes. Up to 4 memory Channels.
LGA 1151/ Socket H4	2015	IntelSkylake (6th gen) IntelKaby Lake (7th gen) IntelCoffee Lake (8th gen) IntelCoffee Lake Refresh (9th gen)	Desktop	LGA	1151	?	5 GT/s - 8 GT/s	used for Intel's 6th generation (Skylake), 7th generation (Kaby Lake), 8th generation (Coffee Lake) processors, and 9th generation (Coffee Lake Refresh) processors
LGA 3647	2016	IntelXeon Phi Intel Skylake-SP	Server	LGA	3647	?	?	used for Intel's Xeon Phi x200 and Xeon Scalable processors
Socket AM4	2016	AMD AthlonBristol Ridge AMD AthlonRaven Ridge 14nm AMD AthlonPicasso 12nm AMD Ryzen1000 series AMD Ryzen2000 series AMD Ryzen3000 series AMD Ryzen4000 series AMD Ryzen5000 series	Desktop	PGA	1331	1	Depends on DDR4 speed	compatible with AMDRyzen 9, Ryzen 7, Ryzen 5 & Ryzen 3 Zen based processors
Socket SP3	2017	AMD EpycNaples AMD EpycRome AMD EpycMilan	Server	LGA	4094	?	Depends on DDR4 speed	compatible with AMD Epyc processors
Socket TR4/ Socket SP3r2	2017	AMD Ryzen Threadripper (1000 series) AMD Ryzen Threadripper (2000 series)	Desktop	LGA	4094	?	Depends on DDR4 speed	compatible with AMD Ryzen Threadripper processors
LGA 2066/ Socket R4	2017	Intel Skylake-X Intel Kaby Lake-X Intel Cascade Lake-X	Desktop Server	LGA	2066	?	?	Used for Intel's 7th generation (Skylake-X & Kaby Lake-X & Cascade Lake-X) series of Core-X processors
Socket sTRX4/ Socket SP3r3	2019	AMD Ryzen Threadripper (3000 series)	Desktop	LGA	4094	?	Depends on DDR4 speed	compatible with 3rd generation AMD Ryzen Threadripper processors
LGA 4189	2020	IntelCooper Lake IntelIce Lake-SP	Desktop Server	LGA	4189^[16]	0.99^[16]
LGA 1200	2020	IntelComet Lake (10th gen) IntelRocket Lake (11th gen)	Desktop	LGA	1200
LGA 1700	2021	IntelAlder Lake (12th gen) IntelRaptor Lake (13th gen) Intel Raptor Lake (14th gen)	Desktop	LGA	1700
Socket sWRX8	2022	AMD Ryzen Threadripper Pro (5000 series)	Desktop	LGA	4094
Socket AM5	2022	AMD Ryzen7000 series AMD Ryzen8000 series (APU) AMD Ryzen9000 series	Desktop	LGA	1718			Zen 4 Ryzen CPUs
Socket SP5	2022	AMD Epyc Genoa	Server	LGA	6096			Used for Epyc Genoa and Milan
LGA 4677	2022	IntelSapphire Rapids intelEmerald Rapids	Server	LGA	4677
Socket SP6	2023	AMD Epyc Siena	Server	LGA	4844
Socket sTR5	2023	AMD Ryzen Threadripper AMD Ryzen Threadripper Pro (7000 series)	Desktop	LGA	4844
LGA 1851	2024	IntelMeteor Lake-PS (Core Ultra Series 1) IntelArrow Lake (Core Ultra 200S Series) TBA	Desktop	LGA	1851
LGA 4710	2023	IntelGranite Rapids	Server	LGA	4710
LGA 7529	2024	IntelSierra Forest	Server	LGA	7529
Socket name	Year of introduction	CPU families supported	Computer type	Package	Pin count	Pin pitch (mm)	Busclock & transfers	Notes

^Some late model Socket 3 motherboards unofficially supported FSB speeds up to 66MHz
^This is a double data rate bus. FSB in the later models.

OtherISAs

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Socket name	Year of introduction	CPU families supported	Computer type	Package	Pin count	Pin pitch (mm)	Busclock & transfers	Notes
Daughter Card	1995	PowerPC 601+	Desktop	Slot	146	?	40-60 Hz
Socket 288	?	PowerPC 603+	Desktop	PGA	288	?	40-60 Hz
Socket 431	1995	Alpha 21064/21064A	Desktop	PGA	431	?	12.5–66.67 MHz
Socket 499	1997	Alpha21164/21164A	Desktop	PGA	499	?	15–100 MHz
Socket 587	1998	Alpha21264	Desktop	PGA	587	?	12.5–133 MHz
Slot B	1999	Alpha21264/21264A	Desktop	Slot	587	?	100 MHz^[17]
PAC418	2001	IntelItanium	Server	PGA	418	?	133 MHz
PAC611	2002	IntelItanium 2 HP PA-8800,PA-8900	Server	PGA	611	?	200 MHz
LGA 1248	2010	IntelItanium 9300-series and up	Server	LGA	1248	?	4.8-6.4 GT/s
Socket name	Year of introduction	CPU families supported	Computer type	Package	Pin count	Pin pitch (mm)	Busclock & transfers	Notes

Slotkets

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

References

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^"Intel 815 Chipset Family"(PDF).Intel. Archived fromthe original(PDF) on December 28, 2009. RetrievedMay 4, 2009.
^"423 Pin Socket (PGA423) Design Guidelines"(PDF).Intel.Archived(PDF) from the original on December 29, 2009. RetrievedMay 3, 2009.
^"495-Pin and 615-pin micro-PGA ZIF Socket Design Specification Application Note"(PDF).Intel. Archived fromthe original(PDF) on February 2, 2012. RetrievedMay 3, 2009.
^^a ^b"mPGA 604 Socket Mechanical Design Guide"(PDF).Intel. Archived fromthe original(PDF) on June 17, 2009. RetrievedMay 3, 2009.
^"Intel Pentium 4 Processor 478-Pin Socket (mPGA478) Design Guidelines"(PDF).Intel. RetrievedMay 3, 2009.
^"AMD Sempron Processor Product Data Sheet"(PDF).AMD. Archived fromthe original(PDF) on April 19, 2009. RetrievedMay 3, 2009.
^"AMD Opteron Processor Product Data Sheet"(PDF).AMD. Archived fromthe original(PDF) on January 17, 2009. RetrievedMay 3, 2009.
^CPU only has 478 pins, but the socket has 479.
^^a ^b ^c ^d"AMD Opteron Processor Product Data Sheet"(PDF).AMD. Archived fromthe original(PDF) on January 17, 2009. RetrievedMay 3, 2009.
^"LGA 775 Socket Mechanical Design Guide"(PDF).Intel. RetrievedMay 4, 2009.
^"LGA771 Socket Mechanical Design Guide"(PDF).Intel. Archived fromthe original(PDF) on August 24, 2009. RetrievedMay 3, 2009.
^"Low-Profile Socket S1 Design Specification"(PDF).AMD. Archived fromthe original(PDF) on December 3, 2008. RetrievedMay 3, 2009.
^"Thermal Design Guide for Socket F (1207) Processors"(PDF).AMD. Archived fromthe original(PDF) on December 5, 2008. RetrievedMay 6, 2009.
^CPU only has 938 pins, but the socket has 941.
^AMD Documentation"Socket AM3 design Specification"(PDF).AMD. Archived fromthe original(PDF) on January 21, 2012. RetrievedJanuary 5, 2012.
^^a ^b"LGA 4189 Socket and Hardware"(PDF).
^Hachman, Mark (February 2, 1999)."Alpha camp moves to "Slot B" connector to push further into workstations".EE Times. RetrievedNovember 10, 2022.

External links

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Socket ID Guide up to 2005
CPU Sockets Chart - A fairly detailed table listing x86 Sockets and associated attributes.
techPowerUp! CPU Database
Processor sockets

v t e EarlyCPU sockets
Otherpackages	DIP PLCC
PGAs	486 Socket Socket 1 Socket 2 Socket 3 Socket 4 (1993) Socket 5 (1994–1995) Socket 6 Socket 7 (1995–1997) Super Socket 7 (1996–1999;non-Intel modification of the original Intel Socket 7) Socket 8

CPU sockets and slots byIntel

Desktop sockets

Slot	Slot 1 (1996–1999)
PGA	370 (1998–2001) 423 (W 2000–2001) 478 (N 2001–2004)
LGA	775 (T 2004–2009) 1366 (B 2008–2010) 1156 (H1 2009–2010) 2011 (R 2011–2013) 1155 (H2 2011–2012) 1150 (H3 2013–2014) 2011-3 (R3 2014–2016) 1151 (H4 2015–2019) 2066 (R4 2017–2019) 1200 (H5 2020–2021) 1700 (V 2021–2023) 1851 (V1 2024)

Mobile sockets

Server sockets

Socket 8 (1995)

Xeon processors

Slot	Slot 2 (1998–2000)
PGA	603 (2001–2004) 604 (2002–2007)
LGA	771 (J 2006) 1366 (B 2008) 1156 (H1 2009) 1567 (LS 2010) 1155 (H2 2011) 2011 (R 2011) 1356 (B2 2012) 1150 (H3 2013) 2011-1 (R2 2014) 2011-3 (R3 2014) 1151 (H4 2015) 3647 (P 2016) 2066 (R4 2017–2019) 1200 (2020) 4189 (P5 2020) 4677 (E 2023) 4710 (2024) 7529 (2024)

Itanium processors

418 (2001)
611 (2002)
1248 (2010)

Pre-Pentium II PGA Sockets

Socket 1
Socket 2
Socket 3
Socket 6
Socket 4 (1993)
Socket 5 (1994–1995)
Socket 7 (1995–1997)
Super Socket 7 (1996–1999;non-Intel modification of the original Intel Socket 7)

AMD sockets and chipsets

AMD sockets

Desktop sockets	Super Socket 7 (1998) Slot A (1999) 939 (2004) 940 (2003) AM2 (2006) AM2+ (2007) AM3 (2009) AM3+ (2011) FM1 (2011) FM2 (2012) FM2+ (2014) AM1 (2014) AM4 (2016) TR4 (2017) sTRX4 (2019) sWRX8 (2020) AM5 (2022) sTR5 (2023)
Mobile sockets	563 S1 (2006) FT1 (2011) FP2 (2012) FS1 FT3 FP3 (2014) FP4 (2015) FT4 (2016) FP5 (2019) FT5 FP6 (2020) FP7 (2022) FP8 FL1 (2023)
Server sockets	940 F (2006) F+ G3 (not released) G34 C32 (2010) SP3 (2017) SP4 (2018) SP5 (2022) SP6 (2023)
Combined sockets	Socket A (2000) 754 (2003)

ATI / AMD chipsets

ATI chipsets	IGP 300 series/RX380 Radeon Xpress 200 CrossFire Xpress 3200 Radeon Xpress 1250
AMD chipsets	480X/570X/580X 690 Series 7-Series 8-Series 9-Series Fusion Controller Hubs AM4 chipsets TR4 chipsets sTRX4 chipsets sWRX8 chipsets AM5 chipsets sTR5 chipsets