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timberwolf · Rated R

Here is a good psu calculator:
http://extreme.outervision.com/psucalculatorlite.jsp

Getting a higher wattage psu than required is good to leave room for overclocking and upgrading. It is also safe to get a higher one because some companies "lie" about their wattage or they say it only achieves that wattage at certain conditions (like at a certain temperature).