New
#11
Basically, when the Intel chipset present on the first SandyBridge/Socket 1155 mobo's was released, it contained a bug where it was possible for the SATA ports present on the board to fail.
Because of the bug, they were recalled and the vendors released new revisioned mobo's with 'Gen3' added, as in they no longer had the bug.
A link to one of the many articles regarding this bug here