all i know is that i ran mine 24/7 with a logysis $15 400 watt psu for about 2 months, it never went out, only changed and my friend gave me a 480 watt (off brand as well, but hey, it works) and its got cool colored fans. but back to the topic, my 400 watt had 16 amps going to +12 rail, 480's got 17a