Quote from: Takamsda on June 15, 2011, 10:19:27 AM

Quote from: Dropkickdragout on June 15, 2011, 10:00:36 AM

Hey bitcoiners, I've got a bit of a problem here and was hoping you could assist me. I'm planning on upgrading my single Nvidia GTX580 to 4 (yes four) AMD 6970's in my primary rig. Now, the problem is, my power supply, while rock solid, is only 850W and with a solid state, a hard drive, 12GB of ram, an i7 970, and an asus rampage extreme all in there, newegg's Calculator told me, very clearcut, that i should have 1650W... wait, what? 1650W? they dont even come that big, so i'm turning to you miners, what the heck do i do? do i stick with my 850W power supply and buy like 2 supplementary PSU's @ 450W each to power my gpu's? I'm at a loss here and welcome your input.

Cheers!

To answer your question

Each 6970 will require 260W each. That's 1040W
And i7 970 drains way too much Wattage.

Minimum PSU Wattage:   1323 W
Recommended PSU Wattage: 1373 W*
Amperage (combined)

+3.3V   +5V   +12V
11.8 A   10.1 A   106.9 A

Minimum UPS rating: 1961 VA
Recommended UPS rating: ** 2600 VA

You'd want a Single Rail for +12V, cuz if not if anything dies there's a chance the PSU will bring the rest with it.

Corsair CMPSU-1200AX is a Single Rail PSU with 100A. What you're asking is impossible.

I'd suggest to drop either the i7 CPU or one of the 6970. No can do with your current set-up.

You'd like to have something that hits no more than 90A. Don't even bother with multi Rail PSUs.

I hope this will help you.

Tip me if you'd like my post!

lol wut. This post is completely bogus. Please do some research before misinforming others. First off you can only estimate how much a gpu will draw, it is impossible to know exactly what it will draw. The only thing that can be measured accurately is the total wattage pull from the socket. Second, there is ZERO difference between multi rail and single rail. With single rail you don't have to worry about balancing the draw over the rails, that's it. Third, it is very much possible for what he is asking. Two GTX 295 which draw more than four 6970's can be powered in that rig with a certain 600w psu with no problems. It has been done before. Google it. However, he would do fine with any psu that has at least 80 amps on the 12v rails to allow headroom for overclocking.