Quote Originally Posted by 003 View Post
I just thought of something. XP can only support dual GPUs, so no quad CFX/ tri-SLI. But, if the 4870X2 is really not "crossfire on a card", and it uses a shared memory pool between the cards, then that means the card would be doing all the splitting of the load between the cores, and not the drivers. Which would presumably mean it would be recognized as a single card, correct? So, if you took two of them for crossfire, would it work in XP?
Only 2 GPUs would work.

DX9's hard limit is 3 frames (3 GPUs in AFR) BUT ATI locked the system down to 2 X2s for Vista CFX I think. 4870 + 4870X2 should work, but I'm not entirely sure.

And most of the time, Vista will have better ATI drivers (it's the trend for about 10 monthly releases already)