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I'm considering an HD 4870 1GB, but I'm still on Win Xp, which only allows 4 gigs of total memory unless I'm mistaken, which means I'll only have "room" for 3GB or RAM. But that should suffice for a while I think.
Don't the 48 series cards use a lot of power though? I'll probably need a new power supply (mine's 550w as I recall).