Cost efficiency of a computer PSU based on watts rating

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http://www.linuxquestions.org – Can someone tell me if there a difference between running a 1000 watt computer PSU and a 1000 watt light bulb? For instance, I’m sure if you burn a 1000 watt light bulb you’d burn the maximum amount of energy all the time (1000 watts). Using the full 1000 watts might be substantially more costly at the end of the month if you didn’t need all the light produced all the time, but of course as long as the light was turned on it would burn the 1000 watts. Now my question about a computer, while 1000 watt is probably an overkill, I’m thinking I should get a bigger wattage PSU than (HowTos)