Slot 1: Single Edge Contact Cartridge (SECC), much like a PCI slot, but with a 242-lead edge-connector..  IT was used by some of Intel's microprocessors, including the Celeron, Pentium II and the Pentium III. Both single and dual processor configurations were implemented.  The Slot 1 specification allows for higher bus rates than Socket 7. Slot 1 motherboards use the GTL+ bus protocol. FSB - 66, 100, and 133  MHz.  There were adapter cards made that allow the use of Socket 370 CPUs in Slot 1.

Slot A: AMD's SECC slot  Same contacts and FSB specs as Slot 1, except a Pentium CPU will not plug into the Slot A.  The choice to use the same mechanical connector as the Intel Slot 1 also allowed motherboard manufacturers to keep costs down by stocking the same part for both Slot 1 and Slot A assemblies.

Socket 370: 370 pins, replaces the older Slot 1 CPU interface on personal computers.  Socket 370 was originally used for the Intel Celeron, but later became the socket/platform for the Coppermine and Tualatin Pentium III processors, as well as the Via-Cyrix Cyrix III, later renamed the VIA C3.  Bus Protocol is GTL+, and the FSB - 66, 100 and 133 MHz. 

Socket 423 was a CPU socket used for the first Pentium 4 processors, based on the Willamette core. The socket was short-lived, as it became apparent that its electrical design proved inadequate for raising clock speed beyond 2.0 GHz. Intel produced chips using this socket for less than a year, from November 2000 to August 2001. It was replaced by Socket 478.  The "PowerLeap PL-P4/N" is a device developed in the form of a socket adapter allowing the use of socket 478 processors on the socket 423.

Socket A (also known as Socket 462): The front side bus frequencies supported for the AMD Athlon XP and Sempron are 133 MHz, 166 MHz, and 200 MHz.  It is 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 the recent AMD Geode NX embedded processors (derived from the Mobile Athlon XP). 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.

Socket 478: Based on Intel's Quad Data Rate technology (After AMDs), with data transferring at four times the clock rate of its front side bus. As such, the 400 MT/s bus was based on a 100 MHz clock signal, but was still able to provide 3.2 GB/s of data to the chipset.  The socket was launched with the Northwood core to compete with AMD's 462-pin Socket A and their Athlon XP processors.  While the original 400 MT/s bus matched the data rate of PC3200, this bus speed was already outdated by the time PC3200 became available.

Socket 479: The CPU socket for the Intel Pentium M and Celeron M, mobile processors normally used in laptops, as well as Tualatin-M Pentium III processors. The official naming by Intel is mFCPGA and mPGA479M. Despite the 479 in the name the Pentium M Processors for this socket use only 478 Pins.  100 MHz (Quadpumped), FSB400 133 MHz (Quadpumped), FSB533.  It uses a different electrical pin-arrangement from socket 478, making it impossible to use a Pentium M in a normal 478 board, but yet the Pentium M fits mechanically in a Socket 478.  There there is an adapter to use pM and cM processors in this socket.

Socket 563: CPU socket used exclusively for low-power (16 W and 25 W TDP) Athlon XP-M processors (Models 8 & 10). This socket can usually be found on laptops and requires a low-power mobile part in a special 563-pin µPGA package which is different from the Socket A (453 pin) package used for other Athlon processors. There exists desktop computer motherboards equipped with socket 563. PCChips is known to have marketed such a board, the M863G Ver3 (actually made by ECS), bundled with a socket 563 processor and a heatsink. 

Socket M: For the Intel Core line of mobile processors. 478 pins (not to be confused with the previous Socket 479). It is used in all Intel Core products, as well as the Core-derived Dual-Core Xeon codenamed Sossaman. It was also used in the first generation of the mobile version of Intel's Core 2 Duo, specifically, the T5x00 and T7x00 Merom lines (referred to as Napa Refresh), though that line switched to Socket P.  533 MT/s, 667 MT/s.

Socket P: For the mobile processor socket replacement for Intel Core 2 chips. It has an 800 or 1066 MT/s FSB, that can be switched 'on the fly' to 400MT/s to save power. 478 pins, but is not pin-compatible with Socket M or Socket 478.  400MT/s, 533 MT/s, 667 MT/s, 800MT/s, 1066MT/s.

Socket 603: For Intel's Xeon processor.  Intended for workstations and server platforms.  All Socket 603 processors utilize a bus speed of 400 MHz. Currently, no Socket 604 processors are produced with Intel's "MP" designation, while some Socket 603 processors have receive the "MP" designation. The "MP" next to the processors speed is the inclusion of an L3 cache to boost performance in multi-processor computers, however, some socket 604 processors are now being manufactured with the addition of an L3 cache up to 16 MB.

Socket 604: For Intel's Xeon processor. Socket 604 was designed by Intel as a Zero Insertion Force socket intended for workstations and server platforms. It contains 604 contacts arrayed about the center of the socket, each contact has a 1.27mm pitch with regular pin array, to mate with a 604-pin processor package. Bus speeds of either 400, 533, 667, 800, or 1066 MHz. 

LGA 775, also known as Socket T: LGA 771 used for (Xeon based). The word "socket" is misleading, because an LGA 775 motherboard has no socket holes; instead, it has 775 protruding pins which touch contact points on the underside of the processor.  LGA 775 offers no bent pins, and better power distribution to the processor, allowing the front side bus to be raised to 1600 MT/s. The 'T' in Socket T was derived from the now canceled Tejas core, which was to replace the Prescott core.  FSB 533 MT/s, 800 MT/s, 1066 MT/s, 1333 MT/s, 1600 MT/s.

Socket 754: Is the original socket for AMD's Athlon 64 desktop processors.  Support for a single channel memory controller (64-bits wide) with maximum of 3 DIMMs (no dual channel support). Lower HyperTransport speed (800 MHz Bi-Directional, 16 bit data path, up and downstream). Lower effective data bandwidth (9.6 GB/s), and lower MFR costs. Socket 754 remained for some time, as AMD's high end solution for mobile applications.  Socket 754 was the more "budget-minded" socket for use with AMD Athlon 64 or Sempron processors.

Socket S1 638 pins; is the CPU socket type used by AMD for their Turion 64, Athlon 64 Mobile and later Sempron processors, which debuted with the dual core Turion 64 X2 CPUs.  It replaces the existing Socket 754 for laptops. Socket S1 includes support for dual-channel DDR2 SDRAM, dual-core mobile CPUs, and virtualization technology, to compete with the mobile Intel Core 2 processor series. 

Socket 939: Both single and dual-core processors were manufactured for this socket under the Athlon 64, Athlon 64 FX, Athlon 64 X2, Sempron and Opteron names. The Opteron 185 and Athlon 64 FX-60, both featuring a 2.6 GHz clock speed and 1 MB of Level 2 cache per core, were the fastest dual-core processors manufactured for this socket. The FX-57 ran slightly faster at 2.8GHz, making it the fastest single core processor supporting the socket 939 interface. It supports dual channel DDR SDRAM memory, with 6.4 GB/s memory bandwidth. Socket 939 processors support 3DNow!, SSE2, and SSE3 (revision E or later) instruction sets. It has one HyperTransport link of 16 bit width that can run as fast as 2000 MT/s. Processors using this socket have 64KB each Level 1 instruction and data caches, and either 256KB, 512KB or 1 MB Level 2 cache.

Socket 940: Is for 64-bit AMD server processors.  200 MHz System clock. 800 MHz / 1 GHz HyperTransport.  Socket 940 and AM2 are not pin-compatible; and, the reason for this is because all 64-bit AMD processors, unlike all current Intel processors, include the memory management functionality not as a discrete chip on the motherboard, but rather on the CPU die itself.  For somewhat related reasons, Socket 939 processors cannot be used in Socket 940 motherboards. Socket 940 was, from the start, primarily geared toward server and higher-end workstation markets.

Socket AM2, renamed from Socket M2: Although it has 940 pins, it is incompatible with the above mentioned Socket 940. Socket AM2 supports DDR2 memory but not DDR memory, which the previous Socket 939 supported. AnandTech reported that Socket AM2 system performance was 0-7% faster than Socket 939 equivalents, with most applications about 2% faster, despite having over 30% greater memory bandwidth due to DDR2 support.  200 MHz System clock, and 1 GHz HyperTransport 2.0. 

Socket AM2+: Also 940 pins, and is a mid-migration from Socket AM2 to Socket AM3 and is fully compatible with Socket AM2, so that processors designed for Socket AM2 work on Socket AM2+ motherboards and vice versa.  The main differences in Socket AM2+ are utilised by AM2+ processors: HyperTransport 3.0 operating at up to 2.6 GHz, and Split power planes: one for the CPU cores, and the other for the Integrated Memory controller (IMC). This will improve power savings, especially with integrated graphics, if the CPU cores are in sleep mode but the IMC is still active.

Socket AM3: 938 (processor pinout), 941 (motherboard socket).     HyperTransport 3.x. 200 MHz System clock.  HyperTransport up to 3.2 GHz. AM3 processors will work on AM2 motherboards. However, socket AM2/AM2+ processors will not work on AM3 motherboards because AM2 processors lack the DDR3 memory controller.  Also, two extra pins and the change in contact placement (940 contacts for AM2 processors, where 938 contacts for AM3 processors) makes the older chips mechanically incompatible with the new socket, preventing users from attempting to install an old chip in a new board.

Socket F: The socket has 1207 pins, and is referred to as "Socket F (1207)." Socket F is the base for the AMD Quad FX Platform. 200 MHz System clock.  1 GHz HyperTransport.  Socket F is primarily for use in AMD's server line, and will be considered to be in the same socket generation as Socket AM2, which will be used for the Athlon 64 and Athlon 64 X2; as well as Socket S1, to be used for Turion 64 and Turion 64 X2 microprocessors. Such socket generations are intended for DDR2 support.  Socket F does not support Fully Buffered DIMM.  Socket F will also likely support DDR3 and other technologies, like XDR-DRAM.

LGA 1366, also known as Socket B: For the Intel Core i7 CPU, which was the first processor to use this socket.  Quick Path interconnect 4.8 GT/s to 6.4 GT/s.  1× to 2× Quickpath. On-die memory controller: the memory is directly connected to the processor.  Three channel memory: each channel can support one or two DDR3 ONLY DIMMs. Motherboards for Core i7 have four (3+1) or six DIMM slots instead of two or four, and DIMMs should be installed in sets of three, not two. The front side bus is replaced by QuickPath interface. Motherboards must use a chipset that supports QuickPath.

Socket G34 - LGA1974: For AMD 6/12Core CPUs.  The CPU cores are still based on the K10 microarchitecture. Max 2600 MHz HyperTransport 3. Four-channel DDR3 memory modules. The original Socket G3 and G3MX were canceled. 

Socket FS1 is a CPU socket to be implemented in the future notebook platform from AMD with its Fusion processors.