IS this really a 500W PSU

Xexoxix

Distinguished
Oct 24, 2012
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From the looks of it, yes, it is. The 480W on the 12V is combined with the 5V 20W output to make 500W (I'm pretty sure). However if you want a really stable, well built, and reliable power supply (not necessarily saying this one isn't), I would suggest something like this -
http://www.amazon.com/Seasonic-M12II-650-BRONZE-Power-Supply/dp/B00607JMI8/ref=sr_1_2?s=electronics&ie=UTF8&qid=1390355365&sr=1-2&keywords=m12ii
although it is very pricey SeaSonic is renowned for making some of the best quality PSUs on the market.