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?