Socket 1156 (LGA1156)

Socket 1156, or LGA1156, is a Land Grid Array socket used by the latest generation of workstation-class Intel Core i5, Core i7 and Xeon microprocessors. The socket supports dual-channel DDR3 SDRAM memory controller, on-chip Direct Media Interface running at 2.5 GT/s, and PCI Express interface. The socket supports processors with frequencies from 1.86 GHz to 2.93 GHz.

The size of LGA775 socket with Independent Loading Mechanism (ILM) is 3.08" x 2.01" (7.825 cm x 5.1 cm). The socket has 1156 contacts arranged as a grid 40 x 40 contacts with 24 x 16 section de-populated in the center, and with 60 land contacts removed mostly from the socket corners and socket edges. Socket LGA1156 has smaller distance between contact pads than the socket 775, which allows the socket 1156 to have 50% more contacts without increasing the size of the package.

  Supported processors  

CPU Family	Frequency	The fastest CPU(s)
Core i5	2.67 GHz	Core i5 I7-750
Core i7	2.8 GHz - 2.93 GHz	Core i7 I7-870
Xeon 3400 series	1.86 GHz - 2.93 GHz	Xeon X3470

There are no CPUs from other manufacturers compatible with socket 1156.

  Compatible package types  

1156-land Flip-Chip Land Grid Array package.

  Upgrading socket 1156 motherboards  

To determine the fastest supported processor for socket 1156 motherboard you'll need to:

• Determine manufacturer and model of the motherboard,
• Search on manufacturer's website for the motherboard model.

  Processor Installation  

For processor installation instructions please check your motherboard manual, or go to this page on Intel website, or view Installation instructions for boxed processors.