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LGA 771, also known as ''Socket J'', is a CPU interface introduced by Intel in 2006. It is used in Intel Core (microarchitecture), Core microarchitecture and NetBurst (microarchitecture), NetBurst microarchitecture(Dempsey) based DP-capable server processors, the Dual-Core Xeon is codenamed Dempsey (microprocessor), Dempsey, Woodcrest (microprocessor), Woodcrest, and Wolfdale (microprocessor), Wolfdale and the Quad-Core processors Clovertown (microprocessor), Clovertown, Harpertown (microprocessor), Harpertown, and Yorkfield-CL. It is also used for the Intel Core 2, Core 2 Extreme QX9775, and blade servers designated under Conroe (microprocessor)#Conroe-CL, Conroe-CL.
It was succeeded by LGA 1366 for the Nehalem (microarchitecture), Nehalem-based Xeon processors.
As its name implies, it is a land grid array with 771 contacts. The word "socket" in this instance is a misnomer, as the processor interface has no pin holes. Instead, it has 771 protruding lands which touch contact points on the underside of the microprocessor.
The "J" in "Socket J" refers to the now-canceled processor codenamed "Tejas and Jayhawk, Jayhawk", which was expected to debut alongside this interface. It is intended as a successor to Socket 604 and takes much of its design from LGA 775 and is almost pin compatible with LGA 775.
Socket 771 CPUs are rotated 90 degrees and have two pins swapped. Small adapters developed by Chinese computer DIY enthusiasts are available to allow LGA 771 CPUs to be installed in LGA 775 motherboards, if the BIOS microcode supports them (but it is also possible to add supporting microcode manually). This also allows for overclocking of Xeon (socket 771) processors when used in the correct (socket 775) motherboards. Some overclockers have managed quite substantial overclocks such as 4.023GHz on a Xeon X5492 for a total overclock of just over 18%. Using a xeon can be a quite viable upgrade path for old LGA775 systems if you have the correct motherboard, chipset and bios revision.
Technical specifications
As its name implies, it is a land grid array with 771 contacts. The word "socket" in this instance is a misnomer, as the processor interface has no pin holes. Instead, it has 771 protruding lands which touch contact points on the underside of the microprocessor.
The "J" in "Socket J" refers to the now-canceled processor codenamed "Tejas and Jayhawk, Jayhawk", which was expected to debut alongside this interface. It is intended as a successor to Socket 604 and takes much of its design from LGA 775 and is almost pin compatible with LGA 775.
Socket 771 CPUs are rotated 90 degrees and have two pins swapped. Small adapters developed by Chinese computer DIY enthusiasts are available to allow LGA 771 CPUs to be installed in LGA 775 motherboards, if the BIOS microcode supports them (but it is also possible to add supporting microcode manually). This also allows for overclocking of Xeon (socket 771) processors when used in the correct (socket 775) motherboards. Some overclockers have managed quite substantial overclocks such as 4.023GHz on a Xeon X5492 for a total overclock of just over 18%. Using a xeon can be a quite viable upgrade path for old LGA775 systems if you have the correct motherboard, chipset and bios revision.
Single core processors
Dual core processors
** Hyperthreading supported only on 50xx series processors(codenamed Dempsey)
Quad core processors
See also
* List of Intel microprocessors * List of Intel Xeon microprocessorsReferences
{{Intelsock Intel CPU sockets