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I cannot even remember what make and model my power supply was now (its half decent) as I've not needed to touch it apart frorm the occasional air duster blow out. I have a 600W PSU which I think is about right for my setup, I have a Intel E6600 @ 3.0GHz, 4GB RAM, 2x8800GT SLI, 2x DVDRW, 4HDD's, 2 Inlet and 3 exhaust fans.

http://www.antec.outervision.com/PSUEngine

The above site gives you a pretty decent guestimate.