LGA 1151, also known as Socket H4, is a type of

zero insertion force Zero insertion force (ZIF) is a type of IC socket or electrical connector that requires very little (but not literally zero) force for insertion. With a ZIF socket, before the IC is inserted, a lever or slider on the side of the socket is m ...

flip-chip

land grid array The land grid array (LGA) is a type of surface-mount packaging for integrated circuits (ICs) that is notable for having the pins on the socket (when a socket is used) — as opposed to pins on the integrated circuit, known as a '' pin grid array' ...

(LGA)

socket Socket may refer to: Mechanics * Socket wrench, a type of wrench that uses separate, removable sockets to fit different sizes of nuts and bolts * Socket head screw, a screw (or bolt) with a cylindrical head containing a socket into which the hexag ...

for

Intel Intel Corporation is an American multinational corporation and technology company headquartered in Santa Clara, California, and Delaware General Corporation Law, incorporated in Delaware. Intel designs, manufactures, and sells computer compo ...

desktop

processors Processor may refer to: Computing Hardware * Processor (computing) ** Central processing unit (CPU), the hardware within a computer that executes a program *** Microprocessor, a central processing unit contained on a single integrated circuit ( ...

which comes in two distinct versions: the first revision which supports both Intel's

Skylake Skylake or Sky Lake may refer to: * Skylake (microarchitecture) Skylake is Intel's codename for its sixth generation Core microprocessor family that was launched on August 5, 2015, succeeding the Broadwell microarchitecture. Skylake is a mic ...

and

Kaby Lake Kaby Lake is Intel's codename for its seventh generation Core microprocessor family announced on August 30, 2016. Like the preceding Skylake, Kaby Lake is produced using a 14 nanometer manufacturing process technology. Breaking with Intel's p ...

CPUs, and the second revision which supports

Coffee Lake Coffee Lake is Intel's codename for its eighth-generation Core microprocessor family, announced on September 25, 2017. It is manufactured using Intel's second 14 nm process node refinement. Desktop Coffee Lake processors introduced i5 and i7 CP ...

CPUs exclusively. LGA 1151 is designed as a replacement for the LGA 1150 (known as ''Socket H3''). LGA 1151 has 1151 protruding pins to make contact with the pads on the processor. The

Fully Integrated Voltage Regulator A voltage regulator module (VRM), sometimes called processor power module (PPM), is a buck converter that provides the microprocessor and chipset the appropriate supply voltage, converting , or to lower voltages required by the devices, allowi ...

, i.e. a voltage regulator which integrated on the CPU's die, introduced with Haswell and Broadwell, has again been moved to the motherboard. Most motherboards for the first revision of the socket support solely

DDR4 Double Data Rate 4 Synchronous Dynamic Random-Access Memory (DDR4 SDRAM) is a type of synchronous dynamic random-access memory with a high bandwidth ("double data rate") interface. Released to the market in 2014, it is a variant of dynamic rando ...

memory, a lesser number support DDR3(L) memory, and the least number have slots for both

or DDR3(L) but only one memory type can be installed. Some have

UniDIMM UniDIMM (short for Universal DIMM) is a specification for dual in-line memory modules (DIMMs), which are printed circuit boards (PCBs) designed to carry dynamic random-access memory (DRAM) chips. UniDIMMs can be populated with either DDR3 or D ...

support, enabling either type of memory to be placed in the same DIMM, rather than having separate DDR3 and DDR4 DIMMs. The second revision socket motherboards support only DDR4 memory. Skylake, Kaby Lake, and Coffee Lake chipsets support

VT-d x86 virtualization is the use of hardware-assisted virtualization capabilities on an x86/x86-64 CPU. In the late 1990s x86 virtualization was achieved by complex software techniques, necessary to compensate for the processor's lack of hardware-a ...

, Intel Rapid Storage Technology, Intel Clear Video Technology, and Intel Wireless Display Technology (an appropriate CPU is required). Most motherboards with the LGA 1151 socket support varying video outputs ( DVI,

HDMI High-Definition Multimedia Interface (HDMI) is a proprietary digital interface used to transmit high-quality video and audio signals between devices. It is commonly used to connect devices such as televisions, computer monitors, projectors, gam ...

1.4 or

DisplayPort DisplayPort (DP) is a digital interface used to connect a video source, such as a Personal computer, computer, to a display device like a Computer monitor, monitor. Developed by the Video Electronics Standards Association (VESA), it can also car ...

1.2 – depending on the model).

VGA Video Graphics Array (VGA) is a video display controller and accompanying de facto graphics standard, first introduced with the IBM PS/2 line of computers in 1987, which became ubiquitous in the IBM PC compatible industry within three years. T ...

output is ''optional'' since Intel dropped support for this video interface starting with Skylake. HDMI 2.0 ( 4K@60 Hz) is only supported on motherboards equipped with Intel's Alpine Ridge Thunderbolt controller. Skylake, Kaby Lake, and Coffee Lake chipsets do not support the legacy

conventional PCI Peripheral Component Interconnect (PCI) is a local computer bus for attaching hardware devices in a computer and is part of the PCI Local Bus standard. The PCI bus supports the functions found on a processor bus but in a standardized format ...

interface; however, motherboard vendors may implement it using external chips.

Heatsink

The 4 holes for fastening the heatsink to the motherboard are placed in a square with a lateral length of 75 mm for Intel's sockets LGA 1156, LGA 1155, LGA 1150, LGA 1151 and

LGA 1200 LGA 1200, also known as Socket H5, is a zero insertion force flip-chip land grid array (LGA) CPU socket, socket, compatible with Intel desktop Central processing unit, processors Comet Lake (10th gen) and Rocket Lake (11th-gen) desktop CPUs, whic ...

. Cooling solutions should therefore be interchangeable.

LGA 1151 revision 1

DDR3 memory support

Intel officially states that Skylake's and Kaby Lake's

integrated memory controller A memory controller, also known as memory chip controller (MCC) or a memory controller unit (MCU), is a digital circuit that manages the flow of data going to and from a computer's main memory. When a memory controller is integrated into another ...

s (IMC) support DDR3L memory modules only rated at 1.35 V and DDR4 at 1.2 V, which led to the speculation that higher voltages of DDR3 modules could damage or destroy the IMC and processor. Meanwhile,

ASRock ASRock Inc. () is a Taiwanese manufacturer of motherboards, Industrial PC, industrial PCs and home theater PCs (HTPC). Established in 2002, it is owned by PEGATRON, a company part of the ASUS group. History ASRock was originally spun off fro ...

Gigabyte The gigabyte () is a multiple of the unit byte for digital information. The SI prefix, prefix ''giga-, giga'' means 109 in the International System of Units (SI). Therefore, one gigabyte is one billion bytes. The unit symbol for the gigabyte i ...

, and

Asus ASUSTeK Computer Inc. (, , , ; stylized as ASUSTeK or ASUS) is a Taiwanese Multinational corporation, multinational computer, phone hardware and electronics manufacturer headquartered in Beitou District, Taipei, Taiwan. Its products include deskto ...

guarantee that their Skylake and Kaby Lake DDR3 motherboards support DDR3 modules rated at 1.5 and 1.65V.

Skylake chipsets (100 series and C230 series)

Kaby Lake chipsets (200 series)

There is no equivalent Kaby Lake chipset analogous to the H110 chipset. Four additional PCH PCI-E lanes in Kaby Lake chipsets are reserved for implementing an M.2 slot to support Intel Optane Memory. Otherwise, corresponding Kaby Lake and Skylake chipsets are practically the same. Light blue indicates a difference between comparable Skylake and Kaby Lake chipsets.

LGA 1151 revision 2

The LGA 1151 socket was revised for the

generation CPUs and comes along with the Intel 300-series chipsets. While physical dimensions remain unchanged, the updated socket reassigns some reserved pins, adding power and ground lines to support the requirements of 6-core and 8-core CPUs. The new socket also relocates the processor detection pin, breaking compatibility with earlier processors and motherboards. As a result, desktop

CPUs are officially not compatible with the 100 (original Skylake) and 200 (Kaby Lake) series chipsets. Similarly, 300 series chipsets officially only support Coffee Lake and are not compatible with Skylake and Kaby Lake CPUs. Socket 1151 rev 2 is sometimes also referred to as "1151-2".

Coffee Lake chipsets (300 series and C240 series)

Like with Kaby Lake chipsets, four additional PCH PCI-E lanes in Coffee Lake chipsets are reserved for implementing an M.2 slot to support Intel Optane Memory. There's a 22 nm version of H310 chipset, H310C, which is sold only in China. Motherboards based on this chipset support DDR3 memory as well. ** depends on OEM's implementation

References

{{Intelsock Intel CPU sockets Computer-related introductions in 2015