Waphlez
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Mentali$T said:lol we could talk about this for ages im just saying that 580W is going to best for him because cards coming out in the future like directX10 cards will need more power so thats why.
And how do you know that? If you hadn't noticed cards are using less power then their predecessors (with an exception to the X1900s). The 7900s use less power the 7800s because they use 90nm sized die vs. 110nm. You need at least 22 amps to run a 7900 GTX (7800 GTX required 26 amps).
http://www.guru3d.com/article/content/325/3/
They said that 350W would be minimum to run the thing, but said anything over 420W would be fine.
500W> Is more then enough to power a single card system.