Some people have a sneaking suspicion that Geil is OCZ incognito. Given that OCZ has opened websites under different monikers in the past, I wouldn't be surprised if it is true. Corsair XMS RAM has proven itself time and again throughout the web. OCZ RAM, while in general seems to do ok, has a stigma of being somewhat unreliable. To be on the safe side, I would definately go with XMS RAM any day.