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6970 Crossfire 850watt enough?

post #1 of 16
Thread Starter 
Ok, Im doing a computer build and I was wondering if 850 watts is enough for 2 6970's. I was originally going with the OCZ ZX1000, but I dont know if its overkill. I do plan on overclocking.

Other PSU choices are Seasonic X850 and Corsair Ax850

What do you guys recommend?



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post #2 of 16
It should be fine considering 6870's in CF require 600-650, and I don't think 6970's draw 100 more Watts each.
post #3 of 16
850 does the trick easily..just use the recommended list in PSU section and grab the cheapest 850 from that list, or even 750 if you're feeling saucy.
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post #4 of 16
i dont thk 6970s use much more then 5870s and im running basicly 3 5870s on a 950.
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post #5 of 16
You can run two 6970s on a 750 watt easily. 850 is overkill and a waste of money. Probably on a quality 650 watt too.
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post #6 of 16
Google 'extreme psu calculator' and use the lite version.
Also I'd say 750watts is enough for cfx 6970 but with overclocking, maybe max 800watts depending on your voltage.
1000watts is for hd 6990s and the like
850 should be sufficient but does not leave much headroom for upgrades.
Also, get the oem windows 7 64-bit as it costs half the price you are paying.
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post #7 of 16
You'll be fine on 850 watts.
    
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post #8 of 16
Quote:
Originally Posted by 1337:) View Post
Google 'extreme psu calculator' and use the lite version.
Also I'd say 750watts is enough for cfx 6970 but with overclocking, maybe max 800watts depending on your voltage.
1000watts is for hd 6990s and the like
850 should be sufficient but does not leave much headroom for upgrades.
Also, get the oem windows 7 64-bit as it costs half the price you are paying.
Yea those calculators are always wrong and over calculatre by a lot. 750 watt is overkill as it is.
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post #9 of 16
http://www.anandtech.com/show/4209/a...e-card-king/18

anandtech hit 684 in furmark and 564watts with Crysis. so you should be okay.

I
Edited by Gabkicks - 5/25/11 at 7:48pm
post #10 of 16
Thread Starter 
Ok, I decided to go with 850 watt psu. Im looking at Getting Corsair AX series or Seasonic X series.

Thanks guys
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