LGA 1151, 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 and Kaby Lake CPUs, and the second revision which supports Coffee Lake 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 voltage regulator has again been moved from the CPU die to the motherboard.
Most motherboards for the first revision of the socket support solely DDR4 memory, a lesser number support DDR3(L) memory, and the least number have slots for both DDR4 or DDR3(L) but only one memory type can be installed. Some have UniDIMM 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 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 because Skylake CPUs dropped support for this video interface. 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 interface; however, motherboard vendors may implement it using external chips.
Heatsinks for sockets LGA 1151, 1150, 1155, and 1156 are interchangeable as they all have the same distance of 75 mm between each screw hole.
Video LGA 1151
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. While physical dimensions remain unchanged, the updated socket re-assigns some reserved pins, adding power and ground lines to support the requirements of 6-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 not compatible with the 100 (original Skylake) and 200 (Kaby Lake) series chipsets. Similarly, 300 series chipsets only support Coffee Lake and are not compatible with Skylake and Kaby Lake CPUs.
Maps LGA 1151
DDR3 memory support
Intel officially states 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 lead to speculation that higher voltages of DDR3 modules could damage or destroy the IMC and processor. Meanwhile, ASRock, Gigabyte, and Asus all guarantee that their Skylake and Kaby Lake DDR3 motherboards support DDR3 modules rated at 1.5 and 1.65V.
Coffee Lake CPUs support only DDR4 memory.
Skylake chipsets (100 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.
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. While Coffee Lake shares the same socket as Skylake and Kaby Lake, this revision of LGA 1151 is electronically incompatible with 100 and 200 series CPUs.
See also
- List of Intel microprocessors
- List of Intel chipsets
References
Source of article : Wikipedia
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