|Chip form factors||Flip-chip land grid array|
|FSB protocol||PCIe 16× (video) + 4× (DMI) + 2 DP (FDI), 2 DDR3 channels|
|Processor dimensions||37.5 × 37.5 mm|
This article is part of the CPU socket series
The last processors supporting it ceased production in 2011.
LGA 1156, along with LGA 1366, were designed to replace LGA 775. Whereas LGA 775 processors connect to a northbridge using the Front Side Bus, LGA 1156 processors integrate the features traditionally located on a northbridge within the processor itself. 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’s NF200 chip to allow even more graphics cards to be used.
- DMI for communication with the Platform Controller Hub (PCH). This consists of a PCI-Express 2.0 ×4 connection.
- FDI for communication with the PCH. This consists of two DisplayPort connections.
- Two memory channels for communication with DDR3 SDRAM. The clock speed of the memory that is supported will depend on the processor.
For LGA 1156 the 4 holes for fastening the heatsink to the motherboard are placed in a square with a lateral length of 75 mm. This configuration was retained for the later, LGA 1155, LGA 1150, and LGA 1151 sockets meaning that cooling solutions should generally be interchangeable.
|µArch||Code name||Brand name||Model (list)||Frequency||Cores/threads||Max. memory speed|
|Lynnfield||Core i5||i5-7xx||2.66–2.8 GHz||4/4||DDR3-1333|
|Core i7||i7-8xx||2.8–3.07 GHz||4/8|
|Xeon||L34xx||1.86 GHz||4/4 or 4/8|
|Core i3||i3-5xx||2.93–3.33 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.
The Desktop chipsets that support LGA 1156 are Intel’s H55, H57, H61, P55, and Q57. Server chipsets supporting the socket are Intel’s 3400, 3420 and 3450.
|Allows using built-in GPU with Intel Clear Video Technology||Yes||No||Yes|
|Maximum USB 2.0 ports[a]||12||14|
|Maximum SATA 2.0/3.0 ports||6|
|Main PCIe configuration||1 × PCIe 2.0 ×16|
|Secondary PCIe||6 × PCIe 2.0 ×1||8 × PCIe 2.0 ×1|
|Conventional PCI support||Yes|
|Intel Rapid Storage Technology (RAID)||?|
|Smart Response Technology||?|
|Intel VT-d, Active Management, Trusted Execution, Anti-Theft, and vPro Technology||No||Yes|
|Maximum TDP||4.5 W|
|Chipset lithography||65 nm|
- 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
- Clarkdale (microprocessor)
- Lynnfield (microprocessor)
- LGA 775
- LGA 1366
- LGA 1155