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		 A 1000w power supply is really useful if you plan to jumpstart your car from your PC.... other than that a 500w ps should be way more than enough for most people. I would say only if you are running 2 7800GTX's with multiple HD's and optical drives..... and lights... and etc etc etc... would you need anything bigger 
 
It's actually hard to say how big of a ps you need unless you tell us what you are trying to power with it. 
		
		
		
		
		
			
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