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The common range of PSU’s today are around 650-1000 watts and boast more efficiency than ever before. Some, like the Thermaltake's Toughpower 1000w, have been certified at 80% efficiency by the 80 Plus program. .(Thermaltake claims the Toughpower as high as 87%+).
One of the reasons for such high numbers is for Overclocking. While a 650watt would handle your typical gaming PC when you start overclocking and adding more video cards the power requirements will quickly will outpace even the best 650's, your power draw will exceed the targeted 80% and the unit will slowly deteriorate until the interior components fail. Higher power units will give you more power and higher dynamic range to handle these growing power demands.
There is certainly no lack of power there.