LGA 1156
Encyclopedia
LGA 1156, also known as Socket H or H1, is an Intel desktop CPU socket
. LGA stands for land grid array
. Its incompatible successor is LGA 1155
.
LGA 1156, along with LGA 1366, were designed to replace LGA 775. LGA 1156 is very different from LGA 775. LGA 775 processors were connected to a northbridge
using the Front Side Bus
. With LGA 1156, the features that were traditionally on a northbridge are integrated onto the processor. The LGA 1156 socket allows the following connections to be made from the processor to the rest of the system:
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.
Note i5 and i7 chips currently manufactured by Intel are not compatible with the LGA 1156 socket.
, and Q57. Server chipsets supporting the socket are Intel's 3400, 3420 and 3450
CPU socket
A CPU socket or CPU slot is a mechanical component that provides mechanical and electrical connections between a microprocessor and a printed circuit board . This allows the CPU to be replaced without soldering....
. LGA stands for land grid array
Land grid array
The land grid array is a type of surface-mount packaging for integrated circuits that is notable for having the pins on the socket rather than the integrated circuit...
. Its incompatible successor is LGA 1155
LGA 1155
LGA 1155, also called Socket H2, is an Intel microprocessor compatible socket which supports Intel Sandy Bridge and the up-coming Ivy Bridge microprocessors....
.
LGA 1156, along with LGA 1366, were designed to replace LGA 775. LGA 1156 is very different from LGA 775. LGA 775 processors were connected to a northbridge
Northbridge (computing)
The northbridge has historically been one of the two chips in the core logic chipset on a PC motherboard, the other being the southbridge. Increasingly these functions have migrated to the CPU chip itself, beginning with memory and graphics controllers. For Intel Sandy Bridge and AMD Fusion...
using the Front Side Bus
Front side bus
A front-side bus is a computer communication interface often used in computers during the 1990s and 2000s.It typically carries data between the central processing unit and a memory controller hub, known as the northbridge....
. With LGA 1156, the features that were traditionally on a northbridge are integrated onto the processor. 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'sNVIDIANvidia is an American global technology company based in Santa Clara, California. Nvidia is best known for its graphics processors . Nvidia and chief rival AMD Graphics Techonologies have dominated the high performance GPU market, pushing other manufacturers to smaller, niche roles...
NF200 chip to allow even more graphics cards to be used. - DMIDirect Media InterfaceThe Direct Media Interface is the link between an Intel northbridge and an Intel southbridge on a computer motherboard. It was first used between the 9xx chipsets and the ICH6, released in 2004. Previous chipsets had used the Hub Interface to perform the same function. Server chipsets use a...
for communication with the Platform Controller HubPlatform Controller HubThe Platform Controller Hub is a family of Intel microchips. I/O Functions have been reassigned between the PCH, a new central hub, and the CPU. Some northbridge functions, the memory controller and PCI-e lanes, were integrated into the CPU while the PCH took over the remaining functions in...
(PCH). This consists of a PCI-Express 2.0 ×4 connection. - FDIFlexible Display InterfaceFDI or Flexible Display Interface is an interconnect created by Intel in order to allow the communication of the HD Graphics integrated GPU found on supported CPUs with the PCH southbridge where display connectors are attached...
for communication with the PCHPlatform Controller HubThe Platform Controller Hub is a family of Intel microchips. I/O Functions have been reassigned between the PCH, a new central hub, and the CPU. Some northbridge functions, the memory controller and PCI-e lanes, were integrated into the CPU while the PCH took over the remaining functions in...
. This consists of two DisplayPortDisplayPortDisplayPort is a digital display interface standard produced by the Video Electronics Standards Association . The specification defines a royalty-free digital interconnect for audio and video. The interface is primarily used to connect a video source to a display device such as a computer monitor...
connections. - Two memory channels for communication with DDR3 SDRAM. The clock speed of the memory that is supported will depend on the processor.
Supported processors
| Code name | Brand name | Model (list) | Frequency | Cores/Threads | Max Memory Speed |
|---|---|---|---|---|---|
| Lynnfield Lynnfield (microprocessor) Lynnfield is the code name for a quad-core processor from Intel released in September 2009. It is sold in varying configurations as Core i5-7xx, Core i7-8xx or Xeon X34xx. Lynnfield uses the Nehalem microarchitecture and replaces the earlier Penryn based Yorkfield processor, using the same 45 nm... |
Core i5 | i5-7xx | 2.66-2.8 GHz | 4/4 | DDR3-1333 |
| Core i7 | i7-8xx | 2.8-2.93 GHz | 4/8 | ||
| Xeon Xeon The Xeon is a brand of multiprocessing- or multi-socket-capable x86 microprocessors from Intel Corporation targeted at the non-consumer server, workstation and embedded system markets.-Overview:... |
L34xx | 1.86 GHz | 4/4 or 4/8 | ||
| X34xx | 2.4-2.93 GHz | ||||
| Clarkdale Clarkdale (microprocessor) Clarkdale is the code name for an Intel processor, initially sold as desktop Intel Core i5 and Core i3 and Pentium. It is closely related to themobile Arrandale processor; both use dual-core dies based on the 32 nm... |
Celeron Celeron Celeron is a brand name given by Intel Corp. to a number of different x86 computer microprocessor models targeted at budget personal computers.... |
G1xxx | 2.26 GHz | 2/2 | DDR3-1066 |
| Pentium | G6xxx | 2.80 GHz | 2/2 | ||
| Core i3 | i3-5xx | 2.93-3.2 GHz | 2/4 | DDR3-1333 | |
| Core i5 | i5-6xx | 3.2-3.6 GHz | 2/4 |
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.
Note i5 and i7 chips currently manufactured by Intel are not compatible with the LGA 1156 socket.
Supported chipsets
The Desktop chipsets that support LGA 1156 are Intel's H55, H57, P55Intel P55
The Intel P55 is the first desktop chipset from Intel based on the PCH chipset design. The P55 Express chipset uses the LGA 1156 socket. Compatible CPUs include the Core i3, i5, and i7 processor line along with a Pentium Processor G6950...
, and Q57. Server chipsets supporting the socket are Intel's 3400, 3420 and 3450
See also
- List of Intel microprocessors
- List of Intel Core i3 microprocessors
- List of Intel Core i5 microprocessors
- List of Intel Core i7 microprocessors
- List of Intel Pentium microprocessors
- List of Intel Celeron microprocessors
- List of Intel Xeon microprocessors
- List of future Intel microprocessors
- Clarkdale (microprocessor)Clarkdale (microprocessor)Clarkdale is the code name for an Intel processor, initially sold as desktop Intel Core i5 and Core i3 and Pentium. It is closely related to themobile Arrandale processor; both use dual-core dies based on the 32 nm...
- Lynnfield (microprocessor)Lynnfield (microprocessor)Lynnfield is the code name for a quad-core processor from Intel released in September 2009. It is sold in varying configurations as Core i5-7xx, Core i7-8xx or Xeon X34xx. Lynnfield uses the Nehalem microarchitecture and replaces the earlier Penryn based Yorkfield processor, using the same 45 nm...
- LGA 775
- LGA 1366