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How many AMP's are needed for 2x 6970's

Last response: in Graphics & Displays
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July 12, 2011 9:26:58 AM

Max power required is around 200W while typical gaming load pulls about a 13A:

http://www.motherboards.org/content/amd-radeon-hd-6970-...

This gives you a 17A requirement for each card. Depending on your processor, you'll need another 13A (i7-9xx series) just for that. If you have one of the newer i7s or a dual core AMD or Intel, your CPU will have less of a power requirement. You also need additional amps for other devices getting power from the 12V rail (ie fans).

You'd be safe with something in the like a Corsair 650TX (53A) or higher. If you're OC'ing anything, go higher (HX/TX/AX 750 or 850).

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July 12, 2011 9:32:33 AM

i got a 750w 40a and mp pc specs are vvvv

3 x 23Inch LED LG E2341V-BN Monitor

AMD Phenom(tm) II X6 1090T Processor 3.20 GHz

Gigabyte GA-890FXA-UD5 MB - AMD 890FX AMD SB850

OCZ 8GIG DDR3 1866Mhz Gold PC15000

ATI Sapphire Radeon HD6970 (got second sitting in box)

OCZ 120GIG SSD

Windows 7 Ultimate 64-bit

also i have 3 fans
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July 12, 2011 10:46:20 AM

Generic power supplies, like the one you list, tend to leave you with too little on the 12V rail.

If you only have 40A available on the 12V, you'll need to get a better power supply to run the 2nd card with any degree of a heavy load. Otherwise you'll start to get some issues when the graphics demand becomes high. In addition to Amps, you'll also need to look for the available wattage for the 12V rail. With that processor and 2 cards, you'll need 525 (200+200+125) available just for those components. Again, the Corsair TX 650 would get you there, though I'd recommend a TX/HX/AX 750W.

You spent good money on those 6970s. You don't want to throw it away because a bad generic power supply ruined them.

With those 2 cards and the 3 monitors (and a new PSU), that will be a great Eyefinity gaming setup.
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July 12, 2011 10:52:56 AM

SilverStone ST75EF 750W Power Supply Silent 135mmFan thats the power supply.
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July 12, 2011 10:55:34 AM

i was told it may be able to handle it, but you seem like you know your stuff, so could you give me a definite answer....
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July 12, 2011 11:04:53 AM

Heck... You should have listed that PSU in the first place. You're covered.

When you listed no brand 750W and 40A, I thought that was the spec, but here's the spec on that supply:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

You have two 12V rails one at 25A and another at 35A! Plug the new card in and have fun! You may have to re-install your drivers for crossfire to work correctly. Every time I changed any physical configuration with my crossfire setups, I had to. Be sure to use the 'express uninstall...' option when uninstalling the AMD catalyst control center and drivers before re-installing.

Great setup. Have fun!
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July 12, 2011 12:52:29 PM

ok sweet thanks for all your help :) 
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July 12, 2011 12:52:41 PM

Best answer selected by CulabunT.
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July 12, 2011 7:24:36 PM

This topic has been closed by Mousemonkey
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