在AMD-ATI的討論區看到解決無法支援CrossFire的方法
http://forums.amd.com/game/messa ... 279&threadid=103355

actualy the catalyst has a profile for nfs.exe (which was the name for an old need for speed game exe)

in this profile crossfire is disabled (so it is why it is very slow on 3870X2)

if you rename the exe like i did by need for speed undercover.exe, there will be no more profile so crossfire will fully work again (tryed it with gpu-z the second card went from 0% activity to 99% activity)

(btw i play on vista 64, but must be same thing on XP)

i actualy saw a other problem, when fraps is running, each of my cards only go to 50% of activity, so game is running mostly same speed as if i had only 1 card, i saw same problem when you change resolution, anti-aliasing and so

to get ride of it i just set the config i want, then i restart the game, and miracle both card are used at 99% and game runs fine


不過自己還沒嘗試是否有效