Performance Accelerator Technology, which was a canterwood feature that boosted performance 5%. However, since the canterwoods and springdales are essentially the same exact (except binned) boards, it only took a matter of time for the springdales to get this feature.
Basically Abit unlocked the PAT in the springdales through a BIOS update and renamed it GAT (Game Accelerator Technology). Right when it was released, IS7's with GAT enabled outperformed the IC7's with PAT enabled. But now both have GAT, so the IC7 remains at the top of the food chain (and it was always a better overclocker, anyway).
And now Intel is destroying the ability to activate PAT/GAT on its springdales, so GAT/PAT may not even be on the IS7's that were recently released.