hey guys i know that you can SLI to diff brand Nvidia cards together but can you crossfire 2 different ATI cards together>? the reason i ask is i dont think they sell the reference HIS 5870 card anymore :S (in aus anyway) but i found a brand called amaze that has a reference card. if they dont xfire together can i just flash the amaze card to the HIS bios to make it think they are both the same card>?