"Unlike most reference 3850s, the Ultimate HD 3850 has a 512MB frame buffer and is outfitted with a passive heat-pipe cooling system for completely silent operation. The Atomic HD 3870 differs from ATI's reference design as well and features higher GPU and memory speeds, a fancy single-slot cooling solution that leverages Microloops' Vapor-X technology, and it has one of the best bundles we have seen in quite a while. Come on by the site and check them out..."