12v Rail

[cobra911]

I have a setup with SLI'd gtx 660's which require 24amps on the 12v rail. I am currently looking at the EVGA SuperNOVA NEX 750 G power supply. It has 4 12v rails with 20amps running all 4. If I only use 2 of the rails, does that mean that they would both use 40amps?

[Rheinwasser]

no. but it will be fine.

get the 750 g2.

[Vendetta]

If you haven't bought that psu then I wouldn't suggest it. Find something with a single 12v rail so you don't have to worry about that.

[cobra911]

What wattage would you suggest for my system then?

Intel Core I7 2600k at 4.4GHz

2x gtx 660's sli mode

1 stick 8gb ram (getting a second)

Corsair H100i Water Cooling cpu

1x 240mm fan

2x 140mm fans

ASUS Sabertooth z77 MOBO

1x ssd

1x hdd

[quan289]

The NEX750G has four 20A +12v rails with a combined rating of 61A.

20A on the +12v rail is 240w. A 660 can draw up to 140w DC during Furmark. http://www.techpowerup.com/reviews/MSI/GTX_660_Gaming/24.html

You may be able to run both of the 660s on one +12v rail, as the OCP trip point is set higher than 20A.

 

Anyways, two of the PEG connectors are from the +12v2 and the other two are from +12v4. Just have each of the 660s power on its own +12v.

 

If you want a PSU recommendation, it would be helpful to know your budget and locations as to where you are able to buy from.