LGA 1356 (Land Grid Array with 1356 pins), also called Socket B2, is an Intel microprocessor socket released in Q1 2012 for the two processor (2P) (i.e dual socket) segment of the server market. It supports 3 64-bit wide DDR3 channels, whereas socket LGA 2011 supports 4 channels and socket LGA 1155 supports 2 channels.

LGA 1356
FSB protocolIntel QuickPath Interconnect
FSB frequencyQuickPath
ProcessorsSandy Bridge
PredecessorLGA 1366
SuccessorLGA 2011
Memory supportDDR3

This article is part of the CPU socket series


LGA 1356 is one of the two sockets designed as a replacement for the LGA 1366 CPU socket, the other being LGA 2011 (which is known as Socket R). LGA 1356 has 1356 protruding pins to make contact with the pads on the processor. Processors of LGA 1356 and LGA 1366 sockets are not compatible with each other since they have different socket notches. It supports Intel Sandy Bridge-EN microprocessors, code-named Romley-EN and marketed as the Xeon E5-2400 series.[1]

The main difference between LGA 2011 and LGA 1356 is 2 Intel QuickPath Interconnect (QPI)s connections on the LGA 2011 and 1 QPI connection on the LGA 1356. Other noticeable differences include 24 lanes of PCI Express (PCI-e) version 3.0 connections compared to 40 lanes on the LGA 2011, and three channels of DDR3 support compared to four on the LGA 2011. Each DDR3 channel can support one more DIMM (only applicable to DDR3 and not DDR3-L).[2]

Plans were leaked in early 2011, with estimated releases in the first quarter of 2012.[3] In September 2011, releases were estimated to be at the end of the first quarter of 2012.[4]

Socket B2 mechanical load limitsEdit

Socket B2 processors have the following mechanical maximum load limits which should not be exceeded during heatsink assembly, shipping conditions, or standard use. Load above those limits will crack the processor die and make it unusable.

Location Dynamic Static
IHS Surface 890 N (200 lbf) 266 N (60 lbf)

Processors using this socket have the same static load limit as previous models using LGA 1366 (Socket B).[5]

See alsoEdit


  1. ^ Timothy Prickett Morgan (May 30, 2011). "Intel's future Sandy Bridge Xeons exposed: x64 iron choices galore". The Register. Retrieved November 12, 2011.
  2. ^ Hiroshige Goto (April 9, 2010). "Sandy Bridge Interface" (PDF). PC Watch website. Archived from the original (PDF) on September 28, 2011. Retrieved November 12, 2011.
  3. ^ Gennadiy Shvets (February 8, 2011). "Details on Intel Xeon E5 product families". CPU World news. Retrieved November 12, 2011.
  4. ^ Theo Valich (September 9, 2011). "Intel Romley Delayed to End of Q1 2012? Chipset, CPU Issues Cited". Bright side of news. Retrieved November 12, 2011.
  5. ^ [1] page 30. From "Intel® Xeon® Processor E5-2400 Product Family Thermal/Mechanical Design Guide" by Intel