LGA 1156

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

LGA 1156
TypeLGA
Chip form factorsFlip-chip land grid array
Contacts1156
FSB protocolPCIe 16× (video) + 4× (DMI) + 2 DP (FDI), 2 DDR3 channels
Processor dimensions37.5 × 37.5 mm[1]
ProcessorsNehalem
Westmere
PredecessorLGA 775 (high-end desktops and low-end servers)
LGA 771 (low- and mid-end servers)
SuccessorLGA 1155
Memory supportDDR3
This article is part of the CPU socket series

The last processors supporting it ceased production in 2011.

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.

The LGA 1156 and LGA 1366 sockets and processors were discontinued sometime in 2012,[4] having been superseded by the LGA 1155 and LGA 2011 respectively.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, and LGA 1151 sockets meaning that cooling solutions should generally be interchangeable.

Supported processors
µArchCode nameBrand nameModel (list)FrequencyCores/threadsMax. memory speed
Nehalem
(45 nm)		 Lynnfield Core i5i5-7xx2.66–2.8 GHz4/4DDR3-1333
Core i7i7-8xx2.8–3.07 GHz4/8
XeonL34xx1.86 GHz4/4 or 4/8
X34xx2.4–3.07 GHz
Westmere
(32 nm)		 Clarkdale Celeron G1xxx2.26 GHz2/2DDR3-1066
Pentium G6xxx2.80 GHz2/2
Core i3 i3-5xx2.93–3.33 GHz2/4DDR3-1333
Core i5 i5-6xx3.2–3.6 GHz2/4
Xeon L34xx2.0–2.27 GHz2/4DDR3-1066

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
Main article: Intel 5 Series

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, 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.

Name[6]H55P55H57Q57
Overclocking Yes?
Allows using built-in GPU with Intel Clear Video Technology YesNoYes
Maximum USB 2.0 ports[lower-alpha 1] 1214
Maximum SATA 2.0/3.0 ports 6
PATA (IDE)[lower-alpha 2] No
Main PCIe configuration 1 × PCIe 2.0 ×16
Secondary PCIe 6 × PCIe 2.0 ×18 × PCIe 2.0 ×1
Conventional PCI support Yes
Intel Rapid Storage Technology (RAID) ?
Smart Response Technology ?
Intel VT-d, Active Management, Trusted Execution, Anti-Theft, and vPro Technology NoYes
Release date Q1'10Q3'09Q1'10
Maximum TDP 4.5 W
Chipset lithography 65 nm

See also

Notes
  1. USB 3.0 is not supported by any of these chipsets. Motherboard manufacturers may use external hardware to add USB 3.0 support.
  2. PATA (IDE) is no longer supported in Series 5, but most motherboard manufacturers chose to include support through the addition of third-party IDE controller.

References
  1. "Intel Core i5/i7 Datasheet" (PDF).
  2. Socket Transition Guidance
  3. Intel Core i7 & i5 Compatibility Sheet Archived December 2, 2010, at the Wayback Machine
  4. "Intel to discontinue LGA 1366 and LGA 1156 processors in 2012". December 8, 2011. Retrieved December 13, 2011.
  5. "Intel's Core i3 and i5 dual-core processors".
  6. "ARK - Compare Intel Products". Intel ARK (Product Specs).
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