LGA 1156

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LGA 1156
Asus P7P55-M LGA 1156.jpg
Type LGA
Chip form factors Flip-chip land grid array
Contacts 1156
FSB protocol PCIe 16× (video) + 4× (DMI) + 2 DP (FDI), 2 DDR3 channels
Processor dimensions 37.5 × 37.5 mm[1]
Processors Intel Celeron
Intel Pentium
Intel Core i3
Intel Core i5
Intel Core i7
Intel Xeon
Predecessor LGA 775
Successor LGA 1155

This article is part of the CPU socket series

LGA 1156, also known as Socket H[2][3] or H1, is an Intel desktop CPU socket. LGA stands for land grid array. Its incompatible successor is LGA 1155.

LGA 1156, along with LGA 1366, were designed to replace LGA 775. Whereas LGA 775 processors connect to a northbridge using the Front Side Bus, 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 (PCH). This consists of a PCI-Express 2.0 ×4 connection.
  • FDI for communication with the PCH. This consists of two DisplayPort connections.
  • Two memory channels for communication with DDR3 SDRAM. The clock speed of the memory that is supported will depend on the processor.

LGA 1156 socket and processors were discontinued sometime in 2012,[4] and superseded by the LGA 1155 socket. LGA 1366 was discontinued at the same time.

Supported processors[edit]

Code name Brand name Model (list) Frequency Cores/threads Max. memory speed
Lynnfield Core i5 i5-7xx 2.66–2.8 GHz 4/4 DDR3-1333
Core i7 i7-8xx 2.8–3.07 GHz 4/8
Xeon L34xx 1.86 GHz 4/4 or 4/8
X34xx 2.4–3.07 GHz
Clarkdale Celeron G1xxx 2.26 GHz 2/2 DDR3-1066
Pentium G6xxx 2.80 GHz 2/2
Core i3 i3-5/9xx 2.93–3.33 GHz 2/4 DDR3-1333
Core i5 i5-6xx 3.2–3.6 GHz 2/4

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.[5]

Supported chipsets[edit]

The Desktop chipsets that support LGA 1156 are Intel's H55, H57, P55, and Q57. Server chipsets supporting the socket are Intel's 3400, 3420 and 3450.

See also[edit]


External links[edit]