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Hey there, Im building a system atm, P5Q-E mobo, Q9550 cpu, 2x500gb Seagates, 4 gb ram, Antec 900 case and a 4870x2 gfx card, and was wondering what size of PSU I'd need to run this easily. I do plan in the future to add a 2nd 4870x2 when 1 doesnt cut it anymore (may take a while, hard to tell) Would I be best using a PSU powerful enough to run the system with 1 in it, and upgrade it when I add a 2nd, or just buy one powerful enough now to run 2 of them? What kinda power would be needed to run both 1, and run 2 of these cards? Thx for any replies