LGA 771, also known as ''Socket J'', is a CPU interface introduced by Intel in 2006. It is used in Intel Core microarchitecture and

NetBurst The NetBurst microarchitecture, called P68 inside Intel, was the successor to the P6 microarchitecture in the x86 family of central processing units (CPUs) made by Intel. The first CPU to use this architecture was the Willamette-core Pentium ...

microarchitecture (Dempsey) based DP-capable server processors, the Dual-Core

Xeon Xeon (; ) is a brand of x86 microprocessors designed, manufactured, and marketed by Intel, targeted at the non-consumer workstation, server, and embedded markets. It was introduced in June 1998. Xeon processors are based on the same archite ...

is codenamed Dempsey, Woodcrest, and Wolfdale and the Quad-Core processors Clovertown, Harpertown, and Yorkfield-CL. It is also used for the

Core 2 Intel Core 2 is a processor family encompassing a range of Intel's mainstream 64-bit x86-64 single-, dual-, and quad-core microprocessors based on the Core microarchitecture. The single- and dual-core models are single- die, whereas the quad-c ...

Extreme QX9775, and blade servers designated under Conroe-CL. It was succeeded by

LGA 1366 LGA 1366 (land grid array 1366), also known as Socket B, is an Intel CPU socket. This socket supersedes Intel's LGA 775 (Socket T) in the high-end and performance desktop segments. It also replaces the server-oriented LGA 771 (Socket J) in the e ...

for the Nehalem-based Xeon processors.

Technical specifications

As its name implies, it is a

land grid array The land grid array (LGA) is a type of surface-mount packaging for integrated circuits (ICs) that is notable for having the pins on the socket (when a socket is used) — as opposed to pins on the integrated circuit, known as a '' pin grid array' ...

with 771 contacts. The socket has 771 protruding spring-loaded pins which touch the lands on the underside of the

microprocessor A microprocessor is a computer processor (computing), processor for which the data processing logic and control is included on a single integrated circuit (IC), or a small number of ICs. The microprocessor contains the arithmetic, logic, a ...

. 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 Socket 604 is a 604-pin microprocessor socket designed to interface an Intel Xeon processor to the rest of the computer. It provides both an electrical interface as well as physical support. This socket is designed to support a heatsink. Launched ...

and takes much of its design from

LGA 775 LGA 775 ( land grid array 775), also known as Socket T, is an Intel desktop CPU socket. Unlike PGA CPU sockets, such as its predecessor Socket 478, LGA 775 has no socket holes; instead, it has 775 protruding pins which touch contact points on th ...

and is almost pin compatible with LGA 775. Compared to LGA 775 CPUs, LGA 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 (LGA 771) processors when used in the correct (LGA 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%.

Single core processors

Dual core processors

*Hyper-threading supported only on 50xx series processors(codenamed Dempsey) Xeon E5140 Processor 2022-11-29

Quad core processors

References

{{Intelsock Intel CPU sockets

Technical specifications

Single core processors

Dual core processors

Quad core processors

See also

References