![]() It is possible to use Socket 7 processors in a Socket 5. Sometimes referred to as Socket 0 or Socket 486 CPUs with an LGA (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. CPUs with a PGA (pin grid array) package are inserted into the socket and, if included, the latch is closed. Many packages are keyed to ensure the proper insertion of the CPU. Modern CPU sockets are almost always designed in conjunction with a heat sink mounting system, or in lower power devices, other thermal considerations.Ī 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. The evolution of the CPU socket amounts to a coevolution of all these technologies in tandem. As CPU and memory frequencies increase, above 30 MHz or thereabouts, electrical signalling increasingly shifts to differential signaling over parallel buses, bringing a new set of signal integrity challenges. Each socket technology will have specific reflow soldering requirements. Likewise, within the chip carrier, the wire bonding technology also becomes more demanding with increasing pin counts and pin densities. Laptops typically use surface-mount CPUs, which take up less space on the motherboard than a socketed part.Īs the pin density increases in modern sockets, increasing demands are placed on the printed circuit board fabrication technique, which permits the large number of signals to be successfully routed to nearby components. Because they allow easy swapping of components, they are also used for prototyping new circuits. Certain devices use Ball Grid Array (BGA) sockets, although these require soldering and are generally not considered user replaceable.ĬPU sockets are used on the motherboard in desktop and server computers. This provides superior mechanical retention while avoiding the risk of bending pins when inserting the chip into the socket. These designs apply a compression force once either a handle (PGA type) or a surface plate (LGA type) is put into place. Common sockets include Pin Grid Array (PGA) or Land Grid Array (LGA). For chips with many pins, zero insertion force (ZIF) sockets are preferred. This allows for placing and replacing the central processing unit (CPU) without soldering.Ĭommon sockets have retention clips that apply a constant force, which must be overcome when a device is inserted. In computer hardware, a CPU socket or CPU slot contains one or more mechanical components providing mechanical and electrical connections between a microprocessor and a printed circuit board (PCB). Circuit board-microprocessor connection LGA 775, a land grid array socket Socket AM2+, a pin grid array socket
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