LGA 1155, also called Socket H2, is an Intel microprocessor compatible socket which supports Intel Sandy Bridge and Ivy Bridge microprocessors.
LGA 1155 is designed as a replacement for the LGA 1156 (known as Socket H). LGA 1155 has 1155 protruding pins to make contact with the pads on the processor. Processors of LGA 1155 and LGA 1156 sockets are not compatible with each other since they have different socket notches.
However, cooling solutions are compatible between both LGA 1155 and LGA 1156 sockets, as the processor has the same dimensions, profile and construction, and similar heat production.http://en.wikipedia.org/wiki/LGA_1155