The most important thing to consider when getting a PSU is not really the Wattage .. but the amount of Ampers on 12V.
I saw some cheap PSU 500W with only 12A on 12V --> This one is only able to give 120W on the 12V !!! Run away from this kind of PSU ..
While modern computer ask a lot on the 12V ( CPU, Graphic card, Hard disks..), this is the most important thing to look at.
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