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Can my PSU take crossfire 7970? - Page 2

post #11 of 38
850W is minimum for 7970 crossfire
post #12 of 38
Quote:
Originally Posted by Bruennis View Post

850W is minimum for 7970 crossfire

No 750 watts is fine and is enough
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post #13 of 38
Quote:
Originally Posted by shilka View Post

No 750 watts is fine and is enough

With two overclocked 7970s and other components you'll be running a 750 unit near maximum load causing it to run hot. You really want to run a power supply near full load for an extended period?

I was running two overclocked 7950s on a a TX750M not too long ago and that was pushing the limits of that unit
post #14 of 38
Quote:
Originally Posted by Bruennis View Post

With two overclocked 7970s and other components you'll be running a 750 unit near maximum load causing it to run hot. You really want to run a power supply near full load for an extended period?

I was running two overclocked 7950s on a a TX750M not too long ago and that was pushing the limits of that unit

With everything at stock clock speeds 750 watts is enough when you start doing crazy overclocks i have no idea what the power draw is
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post #15 of 38
Quote:
Originally Posted by shilka View Post

With everything at stock clock speeds 750 watts is enough when you start doing crazy overclocks i have no idea what the power draw is

Agreed but more likely than not OP will probably end up overclocking his/her cards
post #16 of 38
Quote:
Originally Posted by keikei View Post

Guru3D recommends minimum 750 psu. I run mine on an 850. http://www.guru3d.com/articles_pages/amd_radeon_hd_7970_review,8.html

Same,

My old 750W OCZ Fatal1ty just didn't do it and I'd get shutdowns in games.
 
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post #17 of 38
From a wattage perspective you are cutting close, but it should be ok. Peak power consumption would probably be around 500-550w which is high, but passable with a unit like that. From a practical perspective however, it's not really possible. The unit only comes with two 6-pin PCI-e connectors, given the rail distribution I would not recommend running molex adapters either.

Either way however, you might as well get a new unit. Running a unit at such high load levels is not recommended, as it can affect the lifespan of the unit (especially for an old unit like that, due to capacitor ageing). I personally would recommend an ~800w unit to optimally run a setup like that from a reliability perspective, in which case you can have the unit running at around 50% load on average.
post #18 of 38
Thread Starter 
Also is 48A enough for 2x7970?
post #19 of 38
This should help you come to a conclusion: http://www.legitreviews.com/article/1834/11/

641 total watts at the wall and that's with CPU, ram, and 7970s at stock. Their setup also has no extra storage devices apart from the single SSD and no case fans.

I think everyone can agree that you should have at least an 850W unit.
post #20 of 38
Yes but what about connectivity ? Isn't it 2x6pin or 1 6pin 1 6+2 pin for 7970 ? You shouldn't resort to Molex to Pci-e power adapters. The molex you use to turn into pci-e power will make the rails unbalanced. It's time to upgrade to a newer PSU model. Most internet retailers state how many pci-e connectors and pins the psu have.
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