psu question

[Bolerus]

sorry if this has been asked before, but I have looked around and not quite getting the answer

I am about to buy a gtx 480 from a friend.

I looked at a few power usage calulators, and in a nut shell, they all seem to agrea i need a 650 psu (i will go for at least 750 to be safe)

the problem i am having is... I have read somewhere that the 580 needs 42a on the rails.

there dont seem to be that many psu's with that much ampage on a single rail

so, my question is.. considering that this card requires 2 8 pin conectors.

if i get a psu with lets say 30a per rail, and then use 2 seperate cables for the 2 8 pin conectors, will that achieve the purpose.

also how do you tell if a cable is on a the same rail as another.

is there some kind of understanding psu's for dummies link?

i have seen some psu's with '1 rail for efficient power distribution' offering 60ish amp on the rail, is tha the way to go?

in a summary......help !!!!!

 

[Bolerus]

600? really? that surprises me

the lack of response to this thread make me feel a little bit better, it would seem im not the only one who dosent fully understand all the BS around rails.

I have pretty much decided to discard any PSU with multi rails and to buy one with only one rail (current fave is a thermaltake 850 watt for around 90 squids that has one 72a rail)