List of CPU sockets

There are many different types of CPU socket, used by different CPUs. This list is by date, from most recent to oldest. See also List of Intel CPU slots and sockets and List of AMD CPU slots and sockets.

• PAC611 Intel Itanium
• PAC418 Intel Itanium
• Socket T (Land Grid Array-775) Intel Pentium 4 & Celeron¹
• Socket 604 Xeon
• Socket 480 Intel Pentium M (Dual core)
• Socket 479 Intel Pentium M (Single core)
• Socket 478 Intel Pentium 4 & Celeron¹
• Socket 423 Intel Pentium 4¹
• Socket 370 Intel Celeron & Pentium III
• Socket M2 AMD "Orleans" Athlon 64, AMD "Windsor" Athlon 64 X2, AMD "Orleans⁴" Athlon 64 FX. To be introduced 2006²
• Socket F AMD Opteron processors. To be introduced 2006²
• Socket S AMD Turion 64 mobile processors, to be introduced 2006
• Socket 939 AMD Athlon 64 / AMD Athlon 64 FX to 1GHz²
• Socket 940 AMD Opteron²
• Socket 754 AMD Athlon 64 / Sempron²
• Socket A Later AMD Athlon, Athlon XP, Duron and Sempron
• Socket 563 Low-power Mobile Athlon XP-M (µ-PGA Socket, Mobile parts ONLY)
• Slot 1 Intel Pentium II & early Pentium III³
• Slot A Early AMD Athlon & Alpha 21264³
• Socket 8 Intel Pentium Pro
• Super Socket 7 AMD K6-2 & AMD K6-III
• Socket 7 Intel Pentium & compatibles from Cyrix, AMD
• Socket 6 Intel 486
• Socket 5 Intel Pentium 75-133MHz and compatibles
• Socket 4 Intel Pentium 60/66MHz
• Socket 3 Intel 486 (3.3v and 5v) and compatibles
• Socket 2 Intel 486
• Socket 1 Intel 486
• 486 Socket Intel 486

¹: The 478 pin socket was introduced because it uses a micro-PGA layout which is physically smaller than the socket 423. Socket 775 was introduced with support for PCI express, DDR2 memory and Intel's version of the AMD64 processor extensions (called EM64T), but also moved to the new Land Grid Array physical layout, where the pins are in the socket rather than on the CPU package, for better electrical performance.

²: These sockets are for CPUs with onboard memory controllers. The 754 pin models have a single memory channel routed through the CPU pins. The 939 pin models have two memory channels, hence the higher pin count. The 940 pin CPUs also have two memory channels but they require registered memory, and most have support for SMP. Sockets F and M2 are redesigned to support DDR2. The Socket F contains some 1207 pin-holes (Added pins speculated to be for more scaleability and Power distribution. Socket M2 has 940 pin-holes, but does not support current AMD Opteron processors.

³: The slot packages had two advantages; L2 cache could be installed on the processor package but on a separate piece of silicon, and insertion and removal is simpler and easier. However, it lengthens the path of the traces from the CPU to the chipset and so became unsuitable as clock speeds increased past around 500MHz. They were therefore abandoned and replaced with Socket A/Socket 370.

⁴: It is possible that a Next generation Athlon 64 FX could use the Windsor Dual-Core archeitechure.