12v rail question

[FortressDelve]

Hey guys, new to registering but I've been a lurker for awhile lol. Anyways, I have perhaps a neophyte question about a computer I'm building.

What I want to do is get two EVGA GTX 570 cards and run them in SLI. Well, from the specs on the card, it says it needs 550w and at least 38 amps on the 12v rail. If I SLI these, would that then need 76 amps on the 12v rail or need to use another rail entirely? I'm just unsure whether it combines, or, because both only need 38 amps the one rail that has that will cover it.

Any enlightenment will certainly help me tremendously.

Thanks

 

[FortressDelve]

Thanks for the reply. I already decided to get a Seasonic Platinum-860 power supply.

http://www.amazon.com/gp/product/B00608MP5E/ref=ox_sc_act_title_1?ie=UTF8&m=ATVPDKIKX0DER

It has 71a on the single 12v rail which would satisfy your 60a criteria I think. It just didn't have 76 heh.