LGA 771

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 50xx–52xx Intel Quad-Core Xeon E/X/L 53xx–54xx 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.^[1] 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

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.)

Dual core processors

• • No models support hyperthreading

Intel E5140 Processor. Compatible with socket 771 motherboards. It has two cores at 2.33ghz, 4MB of cache, a FSB speed of 1333mhz and a TDP of 65W.^[2]

Quad core processors

See also

• List of Intel microprocessors
• List of Intel Xeon microprocessors

References