ATI have launched the mega powerful series of 5970 video cards and if you missed our launch review check it out over here.
Sapphire are the latest to release information on their new card which is called the "Sapphire HD 5970 OC" Edition.

The SAPPHIRE HD 5970 OC Edition ships with enhanced clock speeds of 735MHz core and 1010MHz (4.04GHz effective) - faster than the standard model, making the SAPPHIRE HD 5970 OC the fastest card in its class, and the fastest in the world. Enthusiasts will also be able to tune performance of these SAPPHIRE cards using the SAPPHIRE Redline voltage tweaker tool to enable higher levels of overclocking.
We have a few of these cards in our labs right now and we will be following up our launch article with another one in the near future, showing CrossfireX performance. We know one of these can handle anything you throw at it, but there will be a small hardcore audience remortaging their house to run two of these beasts in CFX.