We know that the CPU needs to be connected to the motherboard through an interface to work. After so many years of development, the interface methods adopted by CPU are pin, card, contact and pin. At present, the interfaces of CPU are all pin interfaces, and the corresponding motherboards have corresponding slot types. Different types of CPU interfaces have different jacks in number, volume and shape, so they cannot be plugged into each other.
Socket 478
It turns out that the Socket 478 interface is the interface type adopted by the early Pentium 4 series processors, with 478 pins. The Pentium 4 processor in the socket 478 has a small area and the pins are arranged very closely. Intel's Pentium 4 series and P4 Celeron series all use this interface, and at present, this CPU has gradually withdrawn from the market.
However, at the beginning of 2006, Intel introduced a brand-new Socket 478 interface, which is a special interface for Intel's processors Core Duo and Core Solo. Compared with the earlier desktop Pentium 4 series socket 478 interface, although the number of pins is 478, their pin definitions and voltages are completely different, so they are incompatible with each other. With the overall shift of Intel's processors to the Core architecture, more and more processors will adopt the new Socket 478 interface in the future, such as Celeron M, which will soon launch the Core architecture.
Socket 775
Socket 775, also known as Socket T, is the corresponding interface of CPU encapsulated by Intel LGA775. At present, there are single-core CPUs such as Pentium 4, Pentium 4 EE and Celeron D packaged in LGA775, and dual-core CPUs such as Pentium D and Pentium EE. Different from the previous Socket 478 interface CPU, the bottom of Socket 775 interface CPU has no traditional pins, but 775 contacts, that is, it is not pin-type but contact-type, and transmits signals by contacting with the 775 contact pins in the corresponding Socket 775 slots. Socket 775 interface can not only effectively improve the signal strength and frequency of the processor, but also improve the yield of the processor and reduce the production cost. With the gradual fading out of Socket 478, Socket 775 has become the standard interface of Intel desktop CPU.
Socket 754
Socket 754 is the CPU interface of AMD64-bit desktop platform when it was first released in September 2003. It has 754 CPU pins and only supports single channel DDR memory. At present, there are low-end models of desktop platform Athlon 64 and high-end models of Sempron, as well as mobile platforms such as Mobile Sempron, Mobile Athlon 64 and Turion 64. With AMD turning to support DDR2 memory in 2006, Socket 754 of desktop platform will be gradually replaced by Socket AM2 to unify the interface of AMD desktop processor. At the same time, Socket 754 of mobile platform will be gradually replaced by Socket S 1 which has 638 CPU pins and supports dual-channel DDR2 memory. Socket 754 completed its historical mission at the end of 2007 and was eliminated. On the contrary, its life is much longer than that of Socket 939, which once claimed to replace itself.
Socket 939
Socket 939 is a 64-bit desktop interface standard introduced by AMD in June 2004. It has 939 CPU pins and supports dual-channel DDR memory. At present, Snapdragon 1XX series for entry-level server/workstation market, Athlon 64, Athlon 64 FX and Athlon 64 X2 for desktop market all adopt this interface. In addition, some Sempron specially designed for OEM also adopt Socket 939 interface. Socket 939 processor and Socket 940 slot cannot be mixed, but Socket 939 still uses the same CPU fan system mode. With AMD turning to support DDR2 memory in 2006, Socket 939 was replaced by Socket AM2, which completed its historical mission in early 2007 and was eliminated. Its life span from launch to destruction is less than three years.
Socket 940
Socket 940 is the earliest published AMD64-bit CPU interface standard, which has 940 CPU pins and supports dual-channel ECC DDR memory. At present, Opteron used by servers/workstations and Athlon 64 FX used this interface. With the new Athlon 64 FX and some Snapdragon 1XX series switching to Socket 939 interface, Socket 940 has become a special interface for Snapdragon 2XX series, Snapdragon 8XX series and some Snapdragon 1XX series. With AMD turning to support DDR2 memory in 2006, Socket 940 will be gradually replaced by Socket F, completing its historical mission and being eliminated.
Socket 603
Socket 603 is used professionally and applied to Intel's high-end server/workstation platform. The CPU using this interface is Xeon MP and early Xeon, with 603 CPU pins. The CPU of Socket 603 interface can be compatible with Socket 604 slot.
Socket 604
Similar to Socket 603, Socket 604 is still a high-end server/workstation platform for Intel. The CPU using this interface is Xeon of 533MHz and 800MHz FSB. The CPU of Socket 604 interface is not compatible with Socket 603 slot.
Socket a
Socket A interface, also called Socket 462, is the socket interface of AMD's Athlon XP and Duron processors. Socket A interface has 462 slots and can support 133MHz external frequency.
Socket 423
The socket 423 was the standard interface of the original Pentium 4 processor. The shape of the 423 socket is similar to that of the previous socket, and the corresponding number of CPU pins is 423. With the popularization of DDR memory, Intel developed the i845 chipset supporting SDRAM and DDR memory, and the CPU slot was changed to Socket 478, and the Socket 423 interface disappeared.
Socket 370
Socket 370 architecture is developed by Intel, not a socket architecture. It looks very similar to Socket 7, and it also uses zero-plug slots, and the corresponding CPU is 370 pins. Intel's famous "Copper Mine" and "tualatin" series CPU all use this interface.
Slot 1
Slot 1 is a patented CPU interface developed by Intel Corporation to replace Socket 7. In this way, other manufacturers can't produce products with slot 1 interface. The CPU of SLOT 1 interface is no longer a familiar square, but a flat cuboid, and the interface has also become a golden finger, no longer in the form of a pin. Slot 1 is a slot designed by Intel Corporation for Pentium II series CPU, which integrates Pentium II CPU, its related control circuits and secondary cache on a daughter card. At present, this interface has been eliminated.
Slot 2
Slot 2 is used professionally for high-end servers and graphics workstation systems. The CPU used is also expensive Xeon series. Slot 2 is longer than slot 1. With the design of slot 2, a server can use eight processors at the same time. Moreover, Pentium II CPU with Slot 2 interface adopted the most advanced 0.25 micron manufacturing technology at that time. Motherboard chipsets supporting SLOT 2 interface include 440GX and 450NX.
Slot a
SLOT A interface is similar to Intel's SLOT 1 interface, which is used by AMD's K7 Athlon. In terms of technology and performance, SLOT A motherboard is fully compatible with all kinds of original peripheral expansion cards. It does not use Intel's P6 GTL+ bus protocol, but uses Digital's Alpha bus protocol EV6. EV6 architecture is an advanced architecture, which adopts multi-thread point-to-point topology and supports 200MHz bus frequency.