LGA 1155, also called Socket H2, is a zero insertion force flip-chip land grid array (LGA) CPU socket designed by Intel for their CPUs based on the Sandy Bridge (second generation core) and Ivy Bridge (third generation) microarchitectures.

LGA 1155 also marked the beginning of UEFI secure boot with support in some later boards.

[4] Processors based on Sandy Bridge officially support up to DDR3-1333 memory, however in practice speeds up to DDR3-2133 have been tested to work successfully.

A PC Games Hardware [de] user by the name of Mephisto_xD wrote an article on that website describing how to take UEFI modules from some Z97 motherboards and use them with an Z77-motherboard to make the latter support booting from an SSD using the NVM Express protocol, instead of the AHCI protocol.

[16] That article claims, the Z97 motherboards were the first to officially and fully support the NVMe protocol.