LGA 775
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| Type | LGA |
|---|---|
| Chip form factors | Flip-chip land grid array |
| Contacts | 775 |
| FSB protocol | AGTL+ |
| FSB frequency | 133 MHz (533 MT/s) 200 MHz (800 MT/s) 266 MHz (1066 MT/s) 333 MHz (1333 MT/s) 400 MHz (1600 MT/s) |
| Processor dimensions | 1.47 × 1.47 inches (37.5mm) |
| Processors |
Intel Pentium 4 (2.60 - 3.80 GHz) Intel Celeron D (2.53 - 3.60 GHz) Intel Pentium 4 Extreme Edition (3.20 - 3.73 GHz) Intel Pentium D (2.66 - 3.60 GHz) Pentium Extreme Edition (3.20 - 3.73 GHz) Pentium Dual-Core (1.40 - 3.33 GHz) Intel Core 2 Duo (1.60 - 3.33 GHz) Intel Core 2 Extreme (2.66 - 3.20 GHz) Intel Core 2 Quad (2.33 - 3.00 GHz) Intel Xeon (1.86-3.40 GHz) Intel Celeron (1.60 - 2.40 GHz) |
| Predecessor | Socket 478 |
| Successor |
LGA 1156 LGA 1366 |
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This article is part of the CPU socket series |
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LGA 775, also known as Socket T, is an Intel desktop CPU socket. LGA stands for land grid array. Unlike earlier common CPU sockets, such as its predecessor Socket 478, the LGA 775 has no socket holes; instead, it has 775 protruding pins which touch contact points on the underside of the processor (CPU).
The socket was superseded by the LGA 1156 (Socket H) and LGA 1366 (Socket B) sockets.
The Prescott and Cedar Mill Pentium 4 cores, as well as the Smithfield and Presler Pentium D cores, used the LGA 775 socket. In July 2006, Intel released the desktop processor Core 2 Duo (codenamed Conroe), which also uses this socket, as does the subsequent Core 2 Quad. Intel changed from Socket 478 to LGA 775 because the new pin type offers 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 cancelled Tejas core, which was to replace the Prescott core. Another advantage for Intel with this newer architecture is that it is now the motherboard which has the pins, rather than the CPU, transferring the risk of pins being bent from the CPU to the motherboard. The CPU is pressed into place by a "load plate", rather than human fingers directly. The installer lifts the hinged "load plate", inserts the processor, closes the load plate over the top of the processor, and pushes down a locking lever. The pressure of the locking lever on the load plate clamps the processor's 775 copper contact points firmly down onto the socket's 775 pins, ensuring a good connection. The load plate only covers the edges of the top surface of the CPU (integrated heat spreader). The center is free to make contact with the cooling device placed on top of the CPU.
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