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) rather than the integrated circuit. An LGA can be electrically connected to a ...

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. It is the world's largest semiconductor chip manufacturer by revenue, and is one of the developers of the x86 seri ...

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 ...

. Its incompatible successor is

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 (2nd Gen) and Ivy Bridge (3rd Gen) microarchitectures. It is the successor of L ...

. The last processors supporting it ceased production in 2011. 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 the ...

. Whereas LGA 775 processors connect to a northbridge using the

Front Side Bus A 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 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 chips - a Northbridge (computing), northbridge and Southbridge (computing), ...

(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 display interface developed by a consortium of PC and chip manufacturers and standardized by the Video Electronics Standards Association (VESA). It is primarily used to connect a video source to a display device su ...

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 1156 and LGA 1366 sockets and processors were discontinued sometime in 2012, having been superseded by the

and

LGA 2011 LGA 2011, also called ''Socket R'', is a CPU socket by Intel released on November 14, 2011. It launched along with LGA 1356 to replace its predecessor, LGA 1366 (Socket B) and LGA 1567. While LGA 1356 was designed for dual-processor or ...

respectively.

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, 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 Lake CPUs, ...

, and

LGA 1200 LGA 1200 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, which was released in April 202 ...

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 PCs and home theater PCs (HTPC). Founded by Ted Hsu, it was founded in 2002 and is currently owned by Taiwanese electronics company Pegatron. History ASRock was originally sp ...

, 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

References

External links