Socket 1155 / Socket H2 / Socket LGA1155
Socket 1155, also called LGA1155, or socket H2, is a Land Grid
Array socket that superseded socket 1156. The LGA1155 was introduced
in January 2011 along with second-generation Core CPUs, built on
Sandy Bridge microarchitecture. The socket 1155 (H2) was also
utilized for Ivy Bridge microprocessors, that were launched in 2012.
The LGA1155 works with the latest generations of Intel Celeron,
Pentium, Core i3/i5/i7 and Xeon desktop and server processors, that
have up to 4 CPU cores, up to 8 MB of L3 cache, and operate at
frequencies ranging from 1.2 GHz to 3.7 GHz. The socket H2 supports
dual-channel DDR3 memory with data rates up to 1600 MHz, Direct Media
Interface 2.0 running at 5 GT/s, and PCI Express 2.0 and 3.0 interfaces.
Reportedly, the LGA1155 will be replaced with socket 1150 in 2013.
The size of the socket without Independent Loading Mechanism (ILM)
is 1.67" x 1.67" (4.25 cm x 4.25 cm). The socket H2 has 1155 contacts
arranged as a grid 40 x 40 contacts with 24 x 16 section de-populated
in the center, and with 61 land contacts depopulated mostly from the
socket corners and socket edges. Visually, the contacts look like two
L-shaped sections, opposing each other. The socket 1155 is rated at
minimum 20 processor insertion and removal operations.
All processors, listed below, physically fit into the socket 1155,
although not all of them may be supported. For that reason, before
buying a new CPU please always make sure that the CPU is
compatible with your motherboard. To determine what
microprocessors are supported by a specific motherboard or computer
please see "Upgrading socket 1155 motherboards" section below.
There are no CPUs from other manufacturers compatible with socket 1155.
There are no other sockets, compatible with the LGA1155.
Particularly, the LGA1155 is not compatible with socket 1156. However, many
LGA1156 heatsinks can be used with socket 1155.
Compatible package types
1155-land Flip-Chip Land Grid Array (FC-LGA) package.
Upgrading socket 1155 motherboards
To find out the fastest supported CPU for your motherboard you'll
- For brand name computers like Dell or HP: determine
computer model, and search for it on the manufacturer's website.
Although PC manufacturers may not publish CPU support information for
their computers, you may still find processor upgrade recommendations
in customer support forums.
- If you have a generic computer, or you failed to find anything
on computer manufacturer website for your brand-name computer:
determine make and model of the motherboard in your computer, and
search for it on the motherboard manufacturer's website. For upgrade
information for ABIT, AOpen, ASRock, ASUS, Biostar, DFI, ECS, EVGA,
Foxconn, Gigabyte, Intel, Jetway, MSI, PC Chips and ZOTAC
motherboards please check CPU-Upgrade
- If you can't find CPU support data for you computer and
motherboard, then use CPU-Z or similar program to determine chipset
type in your PC, and look for CPU upgrade information for the
chipset. CPU support data for Intel chipsets can be found on
CPU-Upgrade.com in Intel
chipsets section, or on Intel website. This method is
less reliable than the first two.
Once you determined which processors are compatible with your
motherboard, you can choose the processor based on desired
performance level and how much you want to pay for it:
- Core i7 family offers the best performance from all desktop
processors. These chips have 4 CPU cores, and can handle up to 8
different execution threads simultaneously. Due to very high clock
speed and very large L3 cache, Core i7 microprocessors are still the
best choice even when you run single- and dual-threaded applications.
The drawback of Core i7s is their high price, about $300 and higher for
new boxed CPUs.
- Core i5 microprocessors run somewhat slower than Core i7s, but,
thanks to 4 CPU cores and large cache, they are still very good
upgrade choices when better than average multi-threading performance
is required. Core i5s are usually priced in the $200 - $300 range.
- Core i3 processors have only two cores, smaller size of L3
cache, and they don't support Turbo Boost technology. As a result,
they perform much slower than Core i5s or i7s in multi-threaded
tasks, or executing many single-threaded tasks. The i3 CPUs
incorporate Hyper-Threading technology, that doubles the number of
threads that can be processed at once, but this feature results in only
minor performance improvements. Core i3s are priced from $120 to $150.
- Celerons and Pentiums are budget CPUs, that have even more
features disabled compared to Core i3 family. Price range of Celeron
chips is from $40 to $60, and prices of Pentiums range from $60 to
$100. Although Celeron and Pentium parts are very cheap, they are
more than capable of running simple office and home tasks, like
e-mails, documentation, web searching, etc.
For processor installation instructions please check your motherboard
manual, or go to
page on Intel website, or view
instructions for boxed processors.