Type LGA Voltage range Varies | Contacts 771 | |
 | ||
Chip form factors Flip chip land grid array FSB frequency 667 MT/s, 1066 MT/s, 1333 MT/s, 1600 MT/s Processors Intel Dual-Core Xeon E/X/L 50xx–52xx
Intel Quad-Core Xeon E/X/L 53xx–54xx
Intel Core 2 Extreme QX9775 | ||
LGA 771, also known as Socket J, is a CPU interface introduced by Intel in 2006. It is used in Intel Core microarchitecture based DP-capable server processors, the Dual-Core Xeon is codenamed Dempsey, Woodcrest, and Wolfdale and the Quad-Core processors Clovertown, Harpertown. It is also used for the Core 2 Extreme QX9775.
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It was succeeded by LGA 1366 for the Nehalem-based Xeon processors.
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 "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 are available to allow 771 cpus to be installed in 775 motherboards, if the BIOS supports them.)