How much power do I need?

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May 8, 2009
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Hello, I have a Core i7 920 on a P6T Deluxe (V1) oced to 3.16 ghz on stock cooling, 2x WD black 1tb, a 300gb velociraptor, and 2x 500gb seagate drives (Also 2 dvd drives). My graphics card is a gtx260 and all of this is in an Antec 900 powered by a Zalman 750watt psu.

I was planning on adding a 9500gt for a third monitor, and I was wondering if I have enough power?