I don't think that they have drivers supporting XP and it's a power hungry card.On ati's website it recommends a minimum of a 750W power supply but it's an awesome card here take a look at the comparison with a hd 7970
I'm assuming that 7970 doesn't have windows xp support either.
My brother bought a 7790, and it turned out that it didn't have xp support so now he's stuck with linux. The obvious answer would be to windows 7 but that ain't happening.
So is the 7970 still a viable choice?