for high end PCs with modern components and specially new generation graphic card SMPS affects the stability of the system. Its not always the wattages but Ampere rating on the rails thats more important.
My 400Watt unbranded PSU couldnt keep my PC stable enough with 6800GT, lots of reboots, PC hanging. Replaced it with good branded 450 watt with higher ampere ratings and everything smooth and perfect.
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C2D E6600 L626A195 @ 3.42Ghz 24x7|Asus P5N32-E SLI|Crucial Ballistix DDR2 1000|8600GT|4x320GB Hitachi|SBlive 24bit|OCZ Gamextreme 700Watt PSU|Ultra 120 Extreme|Viewsonic VX2025WM 20.1'' widescreen LCD
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