prodigyk :
well couple years ago i purchased an asus a8n deluxe mobo along with 7900 graphic card but i end up selling the graphic to my older brother and gotten me 1900xtx and i recently got a deal on another 1900xtx so i was wondering can you crossfire it on asus a8n deluxe?...i also read couple forums saying that you can and you need a hacked driver and something about the catalyst will pick it up if you do...not sure about it i haven't tried to install the card...
Crossfire was originally designed to run on the NF4 chipset. That's about as far as it got, I think.
Crossfire uses a north bridge link to connect the two cards (called peer to peer), while SLI uses an external cable.
With your board it is suposed to be possible to get the bios to activate an internal bridge to enable crossfire, but there seem to be few (none?) who have suceeded.
If you are a major bios hacker, you might try to go for it, but there is no known patch AFAIK.