LGA 771

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Socket J (LGA 771)
Type LGA
Chip form factors Flip chip land grid array
Contacts 771
FSB frequency 667 MT/s, 1066 MT/s, 1333 MT/s, 1600 MT/s
Voltage range Varies
Processors Intel Dual-Core Xeon E/X/L 5xxx
Intel Quad-Core Xeon E/X/L 5xxx
Intel Core 2 Extreme QX9775
Predecessor Socket 604
Successor LGA 1366

This article is part of the CPU socket series

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.

It was succeeded by LGA 1366 for the Nehalem-based Xeon processors.

Technical specifications[edit]

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

See also[edit]