HKEPC, has successfully to decipher how the whole ATI Crossfire concept actually works. As a result, they are able to run two slaves cards in Crossfire without the need for the Crossfire edition master card. The amazing feat they have done was to run X850, X700 and X300SE HM on Crossfire! However, this doesn’t come easy at all as it took them a month to reverse engineered the BIOS and Catalyst drivers to make it work. This has proven one thing; Composition engine is only needed for proper image composition not for performance or Crossfire capability between two cards is determine through chipset and drivers.
Hah. For a month worth of reverse engineering, I’ll stick with the legit Crossfire. Interesting article though, so check out the post at TechPowerup.