Socket 7 is the descriptive term for the way certain Intel
Pentium microprocessors plug into a computer
motherboard so that it makes contact with the motherboard's built-in wires or data
bus. Socket 7 is the best-known of eight connection variations that use the Zero Insertion Force (
ZIF) socket. As its name implies, the ZIF socket is designed for ease of manufacture and so that the average computer owner will be able to upgrade the microprocessor. The ZIF socket contains a lever that opens and closes, securing the microprocessor in place. Various sockets have a differing number of pins and pin layout arrangements.
For its Pentium II processor, Intel has moved from the socket configuration to an approach in which the processor is packaged in a cartridge
and fits into a slot in the motherboard.
The following table summarizes the socket characteristics for different Intel processors.
| Socket | Pins | Layout | Processor(s) | Voltage |
|---|
| 0 | 168 | Inline | 486DX | 5 V |
| 1 | 169 | Inline | 486DX,SX | 5 V |
| 2 | 238 | Inline | 486DX,SX,DX2 | 5 V |
| 3 | 237 | Inline | 486DX,SX,DX2,DX4 | 3V or 5 V |
| 4 | 273 | Inline | 60 or 66 MHz Pentium | 5 V |
| 5 | 320 | Staggered | Pentium | 3 V |
| 6 | 235 | Inline | 486DX4 | 3 V |
| 7 | 321 | Staggered | Pentium | 3 V |
| 8 | 387 | Staggered | Pentium Pro | 3 V |
Contributor(s): Nicky Pasternak
This was last updated in September 1998
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