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650W Seasonic PSU okay for Crossfire 6970's?

post #1 of 52
Thread Starter 
For the rig in my signature, would this 650W Seasonic PSU be okay to power it? I will also be throwing in an additional 6970 to run in CF.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151088

1 SSD, 2 Hard Drives, 5 Case fans. 2500k @ 4.5GHz 1.32v, 2x4GB RAM.

So would that PSU be sufficient?
post #2 of 52
Yes.
post #3 of 52
It should be okay, but I'd recommend a 750W since it'd leave much headroom for overclocking.
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hyp3
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post #4 of 52
Thread Starter 
Quote:
Originally Posted by Unoriginal Sin View Post

Yes.

I'm seeing some posts on other forums saying 650W is not enough. I will not be increasing the voltage of the cards at all, and my CPU will remain at the clocks and voltages I have posted. Also, I see forum posts saying that CF 6970's would just barely meet the amp requirements.
post #5 of 52
I run my 7970 at 1.2v at 1250mhz and a 2500k at 4.8ghz at 1.375v, I'm fine with a corsair TX 650, you should be fine
post #6 of 52
Thread Starter 
Quote:
Originally Posted by noak View Post

I run my 7970 at 1.2v at 1250mhz and a 2500k at 4.8ghz at 1.375v, I'm fine with a corsair TX 650, you should be fine

That's only a single 7970, and 7970's draw less power than a 6970. I will be using TWO 6970's.
post #7 of 52
You should be fine.
post #8 of 52
IT will run but just barely. Ideally you would have a 750 watt PSU. You are lucky though in that you have an absolutely ace PSU so you should be fine even with a bit of OCing.
    
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post #9 of 52
Quote:
Originally Posted by ComradeNF View Post

I'm seeing some posts on other forums saying 650W is not enough. I will not be increasing the voltage of the cards at all, and my CPU will remain at the clocks and voltages I have posted. Also, I see forum posts saying that CF 6970's would just barely meet the amp requirements.

Those posts/threads/etc are to be ignored... an AX/X 650 will run two 6970s on a Sandy Bridge rig without any issue whatsoever... you'll load the PSU to 90% or above at times(benching for example) but that's not an issues since we're talking about a high end PSU which can comfortably deal with 650W continuous loads.
Edited by Original Sin - 3/13/12 at 8:50am
post #10 of 52
Thread Starter 
Quote:
Originally Posted by Unoriginal Sin View Post

Those posts/treads/etc are to be ignored... an AX/X 650 will run two 6970s on a Sandy Bridge rig without any issue whatsoever... you'll load the PSU to 90% or above at times(benching for example) but that's not an issues since we're talking about a high end PSU which can comfortably deal with 650W continuous loads.

So basically I might have some random shut-offs during benching? I really would not want that. Also, Jonnyguru listed that the efficiency was 88-90%, so at 90% load on the PSU I would expect that it would randomly shut off or something along the lines of that.

Now I'm starting to get worried. Problem is that there is a sale on this PSU for $100, and the 750W is $50 more, that's why I want this one.
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