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The Winn L. Rosch Hardware Bible, 6th Edition (2 Vol. Set)
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Home » CPU
All CPU Sockets
Author: Gabriel Torres and Cássio Lima
Type: Tutorials Last Updated: September 26, 2007
Page: 1 of 1
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Intel Core 2 Duo Processor - 2.93GHz 3MB Cache 1066MHz FSB Wolfdale-3M Dual-Core Retail Socket 775 E7500 BX80571E7500 BX80571E7500
CircuitCity: $119.99 PC Connection: $141.43
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Since the very first CPU both Intel and AMD have been creating several different sockets and slots to be used by their processors. In this tutorial we will list all socket and slot types released to date with their respective pinouts, also giving examples of compatible CPUs.

In the beginning, a CPU socket was compatible with just one kind of processor. This story changed with the launching of the 486 processor and the massive use of ZIF (Zero Insertion Force) socket, also known as LIF (Low Insertion Force), which has a lever that installs and removes the CPU from the socket without the need of the user or the technician to press the CPU down in order to be installed on the socket. The use of this socket lowered a lot the chances of breaking or bending the CPU pins during its installation or removal. The use of the same pinout by more than one processor allowed the user or the technician to install different processor models on the same motherboard by just removing the old CPU and installing the new one. Of course the motherboard needed to be compatible with the new CPU being installed and also properly configured.

Since then both Intel and AMD have been developing a series of sockets and slots to be used by their CPUs.

The socket created to be used together with the very first 486 processor wasn’t ZIF and didn’t allow you to replace the CPU with a different processor model. Even though this socket didn’t have an official name, let’s call it socket 0. After socket 0 Intel released socket 1, which had the same pinout of socket 0 with the addition of a key pin. It also adopted ZIF standard, allowing the installation of several different processor types on the same socket (i.e. on the same motherboard). Other socket standards were released for the 486 family after socket 1 – socket 2, socket 3 and socket 6 – in order to increase the number of CPU models that could be installed on the CPU socket. Thus socket 2 accepts the same CPUs accepted by socket 1 plus some more models, and so on. Even though socket 6 was designed, it was never used. Thus we usually call the pinout used by 486-class processors as “socket 3”. Intel called “overdrive” the possibility of a socket to accept more than one CPU model. Intel also adopted this name on CPUs that used a pinout from an older CPU, in order to allow it to be installed on an older motherboard.

The first Pentium processors (60 MHz and 66 MHz) used a pinout standard called socket 4, which was fed with 5 V. Pentium processors from 75 MHz on were fed with 3.3 V and thus required a new socket, called socket 5, which was incompatible with socket 4 (a Pentium-60 couldn’t be installed on socket 5 and a Pentium-100 couldn’t be installed on socket 4, for example). Socket 7 uses the same pinout as socket 5 with the addition of one key pin, accepting the same processors accepted by socket 5 plus new CPUs, especially CPUs designed by competing companies (the real difference between socket 5 and socket 7 is that while socket 5 always fed the CPU with 3.3 V, socket 7 allowed the CPU to be fed with a different voltage level, like 3.5 V or 2.8 V, for example). Super 7 socket is a socket 7 capable of running up to 100 MHz, used by AMD CPUs. We usually call the Pentium Classic and compatible CPUs pinout as “socket 7”.

As you may notice, sockets and pinouts at this stage were very confusing, as a given processor could be installed on different socket types. A 486DX-33 could be installed on sockets 0, 1, 2, 3 and, if it were released, 6.

For the next CPUs manufacturers followed a simpler scheme, where each CPU could be installed only on just one socket type.

On the table below we list all socket and slot types created by Intel and AMD since the 486 CPU and examples of CPUs compatible with them.

Socket

Pin Count

Example of Compatible CPUs

Pinout

Socket 0

168

  • 486 DX

Pinout

Socket 1

169

  • 486 DX
  • 486 DX2
  • 486 SX
  • 486 SX2

Pinout

 

Socket 2

238

  • 486 DX
  • 486 DX2
  • 486 SX
  • 486 SX2
  • Pentium Overdrive

Pinout

Socket 3

237

  • 486 DX
  • 486 DX2
  • 486 DX4
  • 486 SX
  • 486 SX2
  • Pentium Overdrive
  • 5x86

Pinout

Socket 4

273

  • Pentium-60 and Pentium-66

Pinout

Socket 5

320

  • Pentium-75 to Pentium-133

Pinout

Socket 6

235

 

  • 486 DX
  • 486 DX2
  • 486 DX4
  • 486 SX
  • 486 SX2
  • Pentium Overdrive
  • 5x86

 

(Never Used)

Socket 7

321

  • Pentium-75 to Pentium-200
  • Pentium MMX
  • K5
  • K6
  • 6x86
  • 6x86MX
  • MII

Pinout

Socket Super 7

321

  • K6-2
  • K6-III

Pinout

Socket 8

387

  • Pentium Pro

Pinout

Socket 370

370

  • Celeron
  • Pentium III FC-PGA
  • Cyrix III
  • C3

Pinout

Socket 423

423

  • Pentium 4

Pinout

Socket 463

463

  • Nx586

Pinout

Socket 478

478

  • Pentium 4
  • Celeron
  • Celeron D
  • Celeron M
  • Core Duo
  • Core Solo
  • Pentium 4 Extreme Edition
  • Pentium M
  • Mobile Pentium III
  • Mobile Celeron
  • Mobile Pentium 4

Pinout

Socket 479
(Socket M)

479

  • Core Duo
  • Core Solo
  • Pentium M
  • Mobile Pentium III
  • Mobile Celeron
  • Mobile
  • Pentium 4
  • Celeron M

Pinout

Socket 775
(LGA775)
(Socket T)

775

  • Pentium 4
  • Pentium 4 Extreme Edition
  • Pentium D
  • Pentium Extreme Edition
  • Celeron D
  • Core 2 Duo
  • Core 2 Extreme

Pinout

Socket 603

603

  • Xeon
  • Mobile Pentium 4

Pinout

Socket 604

604

  • Xeon

Pinout

Socket 771

771

  • Xeon

Pinout

Socket 418

418

  • Itanium

Pinout

Socket 611

611

  • Itanium 2

Pinout

Socket 462
(Socket A)

453

  • Athlon
  • Duron
  • Athlon XP
  • Sempron

Pinout

Socket 754

754

  • Athlon 64
  • Sempron
  • Turion 64

Pinout

Socket 939

939

  • Athlon 64
  • Athlon 64 FX
  • Athlon 64 X2
  • Opteron

Pinout

Socket 940

940

  • Athlon 64 FX
  • Opteron

Pinout

Socket AM2

940

  • Athlon 64
  • Athlon 64 FX
  • Sempron
  • Athlon 64 X2

Pinout

 Socket AM2+

940

  • Athlon 64
  • Athlon 64 X2
  • Opteron
  • Phenom

Not available

Socket S1

638

  • Turion 64 X2

Pinout

 

Socket F

1,207

  • Opteron
  • Athlon 64 FX (7x models)

Pinout

Slot 1

242

  • Pentium II
  • Pentium III (Cartridge)
  • Celeron SEPP (Cartridge)

Pinout

Slot 2

330

  • Pentium II Xeon
  • Pentium III Xeon

Pinout

Slot A

242

  • Athlon (Cartridge)

Pinout

 
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