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http://xtreview.com/addcomment-id-5495-view-Geforce-GTX-260-and-280-power-requirement.html

For the 280 GTX producers recommend the use of power unit with not less than 550 W, with not less than 40 a. Along the +12 v line , for single video card geForce GTX 260 the use of 500 W power unit is enough ( at least 35 a along the +12v line) .

GeForce GTX 280
+12vラインが40a以上の550W.
GeForce GTX 260
+12vラインが35a以上の500W.

なんというドライヤー