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7970 Crossfire Power Supply Advice Needed

post #1 of 10
Thread Starter 
I have recently purchased two Diamond reference 7970's and am waiting on their arrival. My intent (silicon lottery allowing) is to OC these two cards well into the 1200Mhz core range and maybe further on water. I have a Corsair AX850 power supply. I also have an Intel i7-3770K which I intend to overclock. Is this power supply enough to do what I intend to do, or do I need to look for another PSU? I just bought it not 2 months ago, so I would prefer not getting another, but if it is necessary, I will. Any advice is welcome!
post #2 of 10
you have plenty. I have two 7970 sapphire vapor-x's in Xfire with an i5-3570K OC'd to 4.8 GHz (the two GPUs are at 1181/1500 MHz) and my kill-a-watt has shown a highest-usage of 655 watts at the wall (platinum 850W PSU)

a good tool to use can be found at

http://www.extreme.outervision.com/psucalculatorlite.jsp

but i have found it overestimates a bit
Edited by flash2021 - 3/22/13 at 1:47pm
post #3 of 10
Thread Starter 
Quote:
Originally Posted by flash2021 View Post

you have plenty. I have two 7970 sapphire vapor-x's in Xfire with an i5-3570K OC'd to 4.8 GHz (the two GPUs are at 1181/1500 MHz) and my kill-a-watt has shown a highest-usage of 655 watts at the wall (platinum 850W PSU)

a good tool to use can be found at

http://www.extreme.outervision.com/psucalculatorlite.jsp

but i have found it overestimates a bit

Oh thats good news smile.gif i was worried for a sec. That looks like a good tool, i'll definitely use that!
post #4 of 10
You have more then enough power

On a another note if you did not know about it you can buy new cables for your PSU in 4 colors if you are into to that
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post #5 of 10
your psu will be enough. actually even a 750 will do fine..
have fun pal.
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post #6 of 10
you are all good to push it till the pcb burns out

the cards will die before you hit your psu limit
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post #7 of 10
850W.
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post #8 of 10
Since you are pushing your cards and enjoy overclocking. Get a quality 850W power supply. You are going to want at least a 65A rail for those overclocked cards.

These are both good power supplies at a very good value. ($100)

Corsair Enthusiast Series TX850
SILVERSTONE OP850

Both of them pump 70A on the 12v rail, are a solid make and have fair efficiencies.
    
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post #9 of 10
Thread Starter 
Quote:
Originally Posted by Jake_9611 View Post

Since you are pushing your cards and enjoy overclocking. Get a quality 850W power supply. You are going to want at least a 65A rail for those overclocked cards.

These are both good power supplies at a very good value. ($100)

Corsair Enthusiast Series TX850
SILVERSTONE OP850

Both of them pump 70A on the 12v rail, are a solid make and have fair efficiencies.

I have this one:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139015

is this along the lines of what you're talking about?
post #10 of 10
THe PSU you have is more than enough, and you could still do it on a quality 750w PSU.
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