LGA 1155, also called Socket H2, is a socket used for Intel microprocessors based on Sandy Bridge(2k) and Ivy Bridge(3k) microarchitectures. It was designed as a replacement for LGA 1156 (known as Socket H).
LGA 1155 has 1155 protruding pins to make contact with the pads on the processor. The pins are arranged in a 40×40 array with a 24×16 central void and additional 61 omitted pins (two adjoining the central void, six in each of the four corners, and 35 in groups around the perimeter), yielding the 1600 − 384 − 61 = 1155 pin count. Processors for LGA 1155 and LGA 1156 sockets are not compatible with each other since they have different socket notches. Cooling systems are compatible between LGA 1155 and LGA 1156 sockets, as the processors have the same dimensions, profile and construction, and similar levels of heat production. LGA1155 also marked the beginning of secure boot with support in some later board