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2x 6970's on Seasonic X650?

post #1 of 11
Thread Starter 
According to Phaedrus' PSU calculator, the recommended PSU for Crossfire 6970's is 750w, but then he says that this is a recommendation with lots of headroom.

So for just gaming, hardly any benching, and no folding (since these are AMD cards), would my Seasonic X650 hold up? I'm thinking it will, but I would like to be sure (in case I am an idiot).

My CPU OC is at 4.5 GHz, and I would definitely plan on OCing these cards a bit as well.
    
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post #2 of 11
yes it would work fine even with a mild overclock. I'll pull some details and edit the post.

This was meassured at the wall while running furmark (which typically add's 50/100w) and totals the entire system



596w at the wall, taking into account PSU efficiency, lets say 85%, the actual power drawn would be 506w. Your Seaonic should be able to handle that with no problems and like I said you could get a mild overclock on them aswell.

Some PSU's have the ability to work at their max rated wattage without issue's, I believe the seasonic is one of them, plese correct me if im wrong on that.

Anyways bottom line your good to go for a mild overclock, but I wouldn't be breaking records with it

EDIT:

Just remember the power drawn was with furmark and as explained before it typically adds 50/100w, so in turn the power drawn would actually be much lower.
Edited by munaim1 - 10/9/11 at 7:00pm
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post #3 of 11
those are some pretty powerful gpu's..

i wouldn't trust the 650
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post #4 of 11
Leave the power cap at 250W (default) or +0% and it should be near 650W at a synthetic load, less while in games. Seeing as you'll be gaming, and that the X-650 can handle peaks of 650W with no problem, you're okay.
post #5 of 11
PSU's are underated, Meaning they could output more power than it says on the side of the PSU. As above stated, You should be fine!
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post #6 of 11
I would Avoid using a 650, even the x-650 unless you plan to keep the 6970s at stock.

Even our resident PSU guru recomends stepping up to a 750
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post #7 of 11
Yes you are fine.
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post #8 of 11
Quote:
Originally Posted by MrSleepin View Post
those are some pretty powerful gpu's..

i wouldn't trust the 650
Lol, what are you basing that on ? The proof is right above you ^^^
Seasonic is as good as it gets, and will run those just fine. I have pulled 596w at absolute peak while running furmark at 970 core. That's with a 2600k @ 4.7ghz and 8 total case fans. People are forever going way overboard on their psu requirements.

Sent from my Inspire 4g using Tapatalk
post #9 of 11
Thread Starter 
Quote:
Originally Posted by munaim1 View Post
yes it would work fine even with a mild overclock. I'll pull some details and edit the post.

This was meassured at the wall while running furmark (which typically add's 50/100w) and totals the entire system



596w at the wall, taking into account PSU efficiency, lets say 85%, the actual power drawn would be 506w. Your Seaonic should be able to handle that with no problems and like I said you could get a mild overclock on them aswell.

Some PSU's have the ability to work at their max rated wattage without issue's, I believe the seasonic is one of them, plese correct me if im wrong on that.

Anyways bottom line your good to go for a mild overclock, but I wouldn't be breaking records with it

EDIT:

Just remember the power drawn was with furmark and as explained before it typically adds 50/100w, so in turn the power drawn would actually be much lower.
Thank you very much for the info. So, according to your graph, they draw more power than the 580? Would I be able to run SLI 580's on my PSU as well? If I had those I wouldn't do an OC on the GPU's, just stock.
    
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post #10 of 11
The nvidia 4 and 5 series pull a lot on load. The 6970 seem to pull a lot less.
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