That's why is so darn confusing. Usually I can tell by the base specs or if it seems like an OC for the new card. As for those 2 cards, the base specs are exactly the same so its no contest. As for the 8800 GS, 9600 GSO, & GT 240 its not as obvious but in the end, they're all OCs of the latter. But there are still some that think they're completely different cards even though they have the same relative performance.