Sapphire has three iterations of custom card-cooling, encompassing the Vapor-X (non-overclocked), Toxic (pre-overclocked), and Atomic (crème de la crème, pre-overclocked). The Atomic usually ships with the swanky cooler and bundle - aluminium case, anyone? - and increases clock-speeds on all parameters. Cranked up to 1,000MHz core and an effective 4,200MHz memory, the core, in particular, is impressive. Compare this with the ~965MHz we usually achieve when overclocking regular HD 4890 boards.

http://www.hexus.net/content/item.php?item=18244&page=2