funkycasey

Great FAQ and your main point was made perfectly clear to me. I always thought that when two rails showed 22Amps each that they added to 44, but before now, i never knew how it was calculated. Rep + !

MjrTom

Great FAQ.

Nice to see someone take the time to explain in detail an FAQ thats is commonly asked on the forums :)

A good selection of more than capable PSU's

THE-ENIGMA

thanks for the info
my one seem very bad :(
it's 450 watts
but 12v 10A Max 120W out of service

uberjon

looks good. but maybe you should explain to us how we would go about calculating the true amps on a psu. i mean im sure there is some formula u could tell us ^_^

Chozart

There is no real formula... you just need to look carefully at the information provided by the manufacturer. A good source is the label on the PSU itself, and Newegg often provides images of those. Here are a couple of examples, one where an image is available and one where you need to look at the manufacturer's website:

Antec TruePower II: 550W, dual 12V rails of 19A each, and a total max load of 36A (see attached image. The max load is mentioned.)

Hiper Type R: 580W, dual 12V rails of 20A and 18A, and a total max load of 360W, which equals 30A (see website, scroll down to 'output load regulation')
http://www.hipergroup.com/English/pr...hpu-4b580.html

Although these seem almost equally powerful at first glance, the Antec can deliver 6A more on the 12V rails.

I hope this helps :)

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thiru

I don't get it... What use is the second 12V rail? are there mobos with 2 slots or is it specially made for a GPU?

d3daiM

Rails offer stabilty by splitting the load on the 12V line.