400 Watt PSU all that is needed to run 7800 GTX

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Tyler1989

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I was doing some thinking, while reading a A+ Core Hardware prep book I came across something that said the watts on the PCI bus should never go over 400 watts. Yet the lable on the 7800 series boxes say that you should have a 450 minimum power supply and 500 for sli mode.

Why is this if the pci bus cannot accept over 400 watts?




("still for the most part inactive and will remain that way for some time")
 
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