LGA 1151

LGA 1151,[1] also known as Socket H4, is an Intel microprocessor compatible socket which comes in two distinct versions: the first revision which supports both Intel's Skylake[2] and Kaby Lake CPUs, and the second revision which supports Coffee Lake CPUs exclusively.

LGA 1151
TypeLGA
Contacts1151
Processors
PredecessorLGA 1150
SuccessorLGA 1200
Memory support
This article is part of the CPU socket series

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, 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 memory,[1] a lesser number support DDR3(L) memory,[3] and the least number have slots for both DDR4 or DDR3(L) but only one memory type can be installed.[4] Some have UniDIMM support, enabling either type of memory to be placed in the same DIMM, rather than having separate DDR3 and DDR4 DIMMs.[5] The second revision socket motherboards support only DDR4 memory.

Skylake, Kaby Lake, and Coffee Lake chipsets support VT-d, 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 1.4 or DisplayPort 1.2 – depending on the model). VGA output is optional since Intel dropped support for this video interface starting with Skylake.[6] HDMI 2.0 (4K@60 Hz) is only supported on motherboards equipped with Intel's Alpine Ridge Thunderbolt controller.[7]

Skylake, Kaby Lake, and Coffee Lake chipsets do not support the legacy conventional PCI 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 and LGA 1151. Cooling solutions should therefore be interchangeable.

LGA 1151 revision 1

DDR3 memory support

Intel officially states[8][9] that Skylake's and Kaby Lake's integrated memory controllers (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.[10] Meanwhile, ASRock, Gigabyte, and Asus guarantee that their Skylake and Kaby Lake DDR3 motherboards support DDR3 modules rated at 1.5 and 1.65V.[11][12][13]

Skylake chipsets (100 series)
See also: Sunrise Point
H110 B150 Q150 H170 Q170 Z170
Overclocking CPU (via BCLK[14] only;[15] might be disabled in new motherboards and BIOS releases[16]) + GPU + RAM (limited) CPU (multiplier + BCLK[14]) + GPU + RAM
Kaby Lake CPUs support Yes, after a BIOS update[17]
Coffee Lake CPUs support No
Memory support DDR4 (max. 64 GiB total; 16 GiB per slot) or

DDR3(L) (max. 32 GiB total; 8 GiB per slot)[18][19]

Maximum DIMM slots 2 4
Maximum USB 2.0/3.0 ports 6/4 6/6 6/8 4/10
Maximum SATA 3.0 ports 4 6
Processor PCI Express v3.0 configuration 1 ×16 Either 1 ×16; 2 ×8; or 1 ×8 and 2 ×4
PCH PCI Express configuration 6 × 2.0 8 × 3.0 10 × 3.0 16 × 3.0 20 × 3.0
Independent Display Support
(digital ports/pipes)		 3/2 3/3
SATA RAID 0/1/5/10 support No Yes
Intel Active Management, Trusted Execution and vPro Technology NoYesNo
Chipset TDP 6 W
Chipset lithography 22 nm
Release date September 1, 2015[20][21] Q3'15[22] September 1, 2015[20][21] August 5, 2015[23]

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.[24]

Light blue indicates a difference between comparable Skylake and Kaby Lake chipsets.

B250 Q250 H270 Q270 Z270
Overclocking No[25] CPU (multiplier + BCLK[26]) + GPU + RAM
Skylake CPUs support Yes
Coffee Lake CPUs support No
Memory support DDR4 (max. 64 GiB total; 16 GiB per slot) or

DDR3(L) (max. 32 GiB total; 8 GiB per slot)[27]

Maximum DIMM slots 4
Maximum USB 2.0/3.0 ports 6/6 6/8 4/10
Maximum SATA 3.0 ports 6
Processor PCI Express v3.0 configuration 1 ×16 Either 1 ×16; 2 ×8; or 1 ×8 and 2 ×4
PCH PCI Express configuration 12 × 3.0 14 × 3.0 20 × 3.0 24 × 3.0
Independent Display Support
(digital ports/pipes)		 3/3
SATA RAID 0/1/5/10 support No Yes
Intel Active Management, Trusted Execution and vPro Technology No Yes No
Intel Optane Memory Support Yes, requires Core i3/i5/i7 CPU[28]
Chipset TDP 6 W[29]
Chipset lithography 22 nm[29]
Release date January 3, 2017[30]

LGA 1151 revision 2

Second revision of the LGA 1151 socket for Coffee Lake CPUs

The LGA 1151 socket was revised for the Coffee Lake generation CPUs and comes along with the Intel 300-series chipsets.[31] 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 Coffee Lake CPUs are officially not compatible with the 100 (original Skylake) and 200 (Kaby Lake) series chipsets.[32] 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)

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.[33][34] Motherboards based on this chipset support DDR3 memory as well.

H310 B365 B360 H370 Q370 Z370 Z390
Overclocking No CPU (multiplier + BCLK[35]) + GPU + RAM
Skylake/Kaby Lake CPUs support No
Coffee Lake CPUs support Yes* Yes Yes* Yes
Memory support DDR4 (max. 64 GiB total; 16 GiB per slot);

9th gen Coffee Lake CPUs support up to 128GiB of RAM using 32GiB memory modules[36]

Maximum DIMM slots 2 4
Maximum USB 2.0 ports 10 14 12 14
USB 3.1 ports configuration 4 Gen 1 Ports 8 Gen 1 Ports Up to 4 Gen 2 Ports

Up to 6 Gen 1 Ports

 Up to 4 Gen 2 Ports

Up to 8 Gen 1 Ports

 Up to 6 Gen 2 Ports

Up to 10 Gen 1 Ports

 10 Gen 1 Ports Up to 6 Gen 2 Ports

Up to 10 Gen 1 Ports

Maximum SATA 3.0 ports 4 6
Processor PCI Express v3.0 configuration 1 ×16 Either 1 ×16; 2 ×8; or 1 ×8 and 2 ×4
PCH PCI Express configuration 6 × 2.0 20 × 3.0 12 × 3.0 20 × 3.0 24 × 3.0
Independent Display Support (digital ports/pipes) 3/2 3/3
Integrated Wireless (802.11ac) Yes** No Yes** No Yes**
SATA RAID 0/1/5/10 support No Yes No Yes
Intel Optane Memory Support No Yes, requires Core i3/i5/i7/i9 CPU
Intel Smart Sound Technology No Yes
Chipset TDP 6 W[37]
Chipset lithography 14 nm[38] 22 nm 14 nm 22 nm[37] 22 nm[37]
Release date April 2, 2018[39] Q4'18 April 2, 2018 October 5, 2017[40] October 8, 2018[41]

* Yes, however, motherboards require a BIOS update in order to support the 9th gen Coffee Lake CPUs

** depends on OEM's implementation

See also

References
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