LGA 1155

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LGA 1155
Intel Socket 1155.jpeg
Type LGA
Contacts 1155
Processor dimensions 37.5mm × 37.5mm[1]
Processors Sandy Bridge, Ivy Bridge
Predecessor LGA 1156
Successor LGA 1150

This article is part of the CPU socket series
View of the socket LGA 1155 on an Intel Core i7 Sandy Bridge 2600K model CPU

LGA 1155, also called Socket H2, is an Intel microprocessor compatible socket which supports Intel Sandy Bridge and Ivy Bridge microprocessors.

Its incompatible high-performance counterpart for Intel desktops and servers is the LGA 2011.

LGA 1155 is designed as a replacement for the LGA 1156 (known as Socket H). LGA 1155 has 1155 protruding pins to make contact with the pads on the processor. The pins are arranged in a 40x40 array with a 24x16 central void; a further 61 pins are omitted, 2 adjoining the central void and 59 in groups around the perimeter, yielding the 1600 - 384 - 61 = 1155 pin count. Processors of LGA 1155 and LGA 1156 sockets are not compatible with each other since they have different socket notches. However, cooling systems are compatible between both LGA 1155 and LGA 1156 sockets, as the processor has the same dimensions, profile and construction, and similar heat production.[2]

Integrated USB 3.0 support is present in the Z75, Z77, H77, Q75, Q77 and B75 chipsets intended for Ivy Bridge CPUs. Refer to list of Intel chipsets for the complete list of socket 1155 chipsets.

Original Sandy Bridge chipsets[edit]

See also: Cougar Point

Sandy Bridge chipsets, except Q65, Q67 and B65, support both Sandy Bridge and Ivy Bridge CPUs through a BIOS upgrade.[3] Sandy Bridge based processors officially support up to DDR3-1333 memory, however in practice speeds up to DDR3-2133 have been tested to work successfully.[4]

The H61 chipset only supports one double-sided DIMM per memory-channel and therefore is limited to 16 GB instead of the 32 GB like the others support.[5] On motherboards with four DIMM slots, only four single-sided DIMMs can be installed.[6]

Name B65 H61 Q67 H67[7] P67 Z68[8]
Overclocking GPU CPU + RAM CPU + GPU + RAM
Allows using built-in GPU with Intel Clear Video Technology Yes No Yes
Maximum USB 2.0 ports1 12 10 14
Maximum SATA 2.0/3.0 ports 4 / 1 4 / 0 4 / 2
Main PCIe Configuration 1 × PCIe 2.0 ×16 1 × PCIe 2.0 ×16
or 2 × PCIe 2.0 ×8
Secondary PCIe 8 × PCIe 2.0 6 × PCIe 2.0 8 x PCIe 2.0
Conventional PCI support2 Yes No Yes No
Intel Rapid Storage Technology (RAID) No Yes
Smart Response Technology No Yes
Ivy Bridge Processor Support No Yes No Yes
Intel Active Management, Trusted Execution, Anti-Theft, and vPro Technology No Yes No
Release Date February 2011 May 2011 January 2011 May 2011
Max TDP 6.1 W
Chipset lithography 65 nm

[9] Table updated with the latest information from Intel ARK

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 Although some of the chipsets do not support conventional PCI, motherboard manufacturers may include support through the addition of third party chips.

Ivy Bridge chipsets[edit]

See also: Panther Point

All Ivy Bridge chipsets and motherboards support both Sandy Bridge and Ivy Bridge CPUs. Ivy Bridge based processors will officially support up to DDR3-1600, up from DDR3-1333 of Sandy Bridge. Some consumer Ivy Bridge chipsets will also allow overclocking of K-series processors.[10]

Name B75 Q75 Q77 H77 Z75 Z77
Overclocking CPU(Bclk) + GPU CPU + GPU + RAM
Allows using built-in GPU Yes
Intel Clear Video Technology Yes
RAID No Yes
Maximum USB 2.0/3.0 ports 8 / 4 10 / 4
Maximum SATA 2.0/3.0 ports 5 / 1 4 / 2
Main PCIe Configuration3 1 × PCIe 3.0 ×16 1 × PCIe 3.0 ×16
or 2 × PCIe 3.0 ×8
1 × PCIe 3.0 ×16
or 2 × PCIe 3.0 ×8
or 1 × PCIe 3.0 ×8 + 2 × PCIe 3.0 ×4
Secondary PCIe 8 × PCIe 2.0
Conventional PCI4 Yes No [11]
Intel Rapid Storage Technology No Yes
Intel Anti-Theft Technology Yes
Smart Response Technology No Yes No Yes
Intel vPro No Yes No
Release Date April 2012[12]
Max TDP 6.7 W
Chipset lithography 65 nm[13]

[14]

3 For PCIe 3.0 capability, the Ivy Bridge CPU must have the relevant PCIe 3.0 controller built in. Some Ivy Bridge CPUs only have a PCIe 2.0 controller built in.

4 Although some of the chipsets do not support conventional PCI, motherboard manufacturers may include support through the addition of third party chips.

See also[edit]

References[edit]

External links[edit]