LGA 1156 (

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' ...

1156), also known as Socket H or H1, is an

Intel Intel Corporation is an American multinational corporation and technology company headquartered in Santa Clara, California, and Delaware General Corporation Law, incorporated in Delaware. Intel designs, manufactures, and sells computer compo ...

desktop

CPU socket In computer hardware, a CPU socket or CPU slot contains one or more mechanical components providing mechanical and electrical connections between a microprocessor and a printed circuit board (PCB). This allows for placing and replacing the centr ...

. The last processors supporting the LGA 1156 ceased production in 2011. It was succeeded by the mutually incompatible socket

LGA 1155 LGA 1155, also called Socket H2, is a zero insertion force flip-chip land grid array (LGA) CPU socket designed by Intel for their CPUs based on the Sandy Bridge (second generation core) and Ivy Bridge (microarchitecture), Ivy Bridge (third gen ...

. LGA 1156, along with

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 ...

, were designed to replace

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 ...

. Whereas LGA 775 processors connect to a northbridge using the

Front Side Bus The front-side bus (FSB) is a computer communication interface (bus) that was often used in Intel-chip-based computers during the 1990s and 2000s. The EV6 bus served the same function for competing AMD CPUs. Both typically carry data between the ...

, LGA 1156 processors integrate the features traditionally located on a northbridge within the processor itself. The LGA 1156 socket allows the following connections to be made from the processor to the rest of the system: * PCI-Express 2.0 ×16 for communication with a graphics card. Some processors allow this connection to be divided into two ×8 lanes to connect two graphics cards. Some motherboard manufacturers use Nvidia's NF200 chip to allow even more graphics cards to be used. *

DMI DMI may refer to: Organizations * Danish Meteorological Institute * Data Management Inc., a time-and-attendance software company * Dead Man Incorporated, a predominantly white prison-gang formed in Maryland * Development Media International, a ...

for communication with the

Platform Controller Hub The Platform Controller Hub (PCH) is a family of Intel's single-chip chipsets, first introduced in 2009. It is the successor to the Intel Hub Architecture, which used two chipsa northbridge and southbridge, and first appeared in the Intel 5 Se ...

(PCH). This consists of a PCI-Express 2.0 ×4 connection. * FDI for communication with the PCH. This consists of two

DisplayPort DisplayPort (DP) is a digital interface used to connect a video source, such as a Personal computer, computer, to a display device like a Computer monitor, monitor. Developed by the Video Electronics Standards Association (VESA), it can also car ...

connections. * Two memory channels for communication with DDR3 SDRAM. The clock speed of the memory that is supported will depend on the processor. The LGA 1366 platform reached EOL on June 29, 2012. LGA 1156 reached EOL on December 7, 2012.

Heatsink

For LGA 1156 the 4 holes for fastening the heatsink to the motherboard are placed in a square with a lateral length of 75 mm. This configuration was retained for the later, LGA 1155,

LGA 1150 LGA 1150, also known as Socket H3, is a zero insertion force flip-chip land grid array (LGA) CPU socket designed by Intel for CPUs built on the Haswell microarchitecture. This socket is also used by the Haswell's successor, Broadwe ...

LGA 1151 LGA 1151, also known as Socket H4, is a type of zero insertion force flip-chip land grid array (LGA) socket for Intel desktop processors which comes in two distinct versions: the first revision which supports both Intel's Skylake and Kaby L ...

, and

LGA 1200 LGA 1200, also known as Socket H5, is a zero insertion force flip-chip land grid array (LGA) CPU socket, socket, compatible with Intel desktop Central processing unit, processors Comet Lake (10th gen) and Rocket Lake (11th-gen) desktop CPUs, whic ...

sockets meaning that cooling solutions should generally be interchangeable.

Supported processors

All LGA 1156 processors and motherboards made to date are interoperable, making it possible to switch between a Celeron, Pentium, Core i3 or Core i5 with integrated graphics and a Core i5 or Core i7 without graphics. However, using a chip with integrated graphics on a P55 motherboard will (in addition to likely requiring a BIOS update) not allow use of the on-board graphics processor, and likewise, using a chip without integrated graphics on a H55, H57 or Q57 motherboard will not allow use of the motherboard's graphics ports.

Supported chipsets

The Desktop chipsets that officially support LGA 1156 are Intel's H55, H57, P55, and Q57. Server chipsets supporting the socket are Intel's 3400, 3420 and 3450. Some small Chinese manufacturers are producing LGA 1156 motherboards based on H61 chipset, and

ASRock ASRock Inc. () is a Taiwanese manufacturer of motherboards, Industrial PC, industrial PCs and home theater PCs (HTPC). Established in 2002, it is owned by PEGATRON, a company part of the ASUS group. History ASRock was originally spun off fro ...

, for very short time, produced LGA 1156 motherboard based on P67 chipset, the P67 Transformer. It exclusively supports Lynnfield processors and was discontinued after B2 revision of 6 series chipsets was recalled, not receiving a version with B3 revision of P67 chipset.

Notes

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