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 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.