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Will a 1000W PSU power 3x6970 Lightnings?

post #1 of 14
Thread Starter 
I just bought the screen in my sig and am in the process of building my "dream rig" to be based around AMD's bulldozer. The parts have been purchased over time, but most I have already bought including 2x MSI 6970 Lightnings (MAX TDP 269W).

The 1000W Strider Power supply I have had for a while and I am worried that if I decided to buy another 6970 lightning (to make 3 total) that I won't have enough juice when all cards are maxed out @ 1600p. I am particularly worried about demanding games like Metro DoF ON, Witcher 2 Ubersambling ON, etc.

I have not yet decided to get one more lightning, as there are other parts of my rig still missing (mainly Crosshair 5 and Bulldozer), BUT if I do pick up another card do the experts here think my Strider 1000W will be up to the task?

Thanks for the help.
post #2 of 14
I believe it should be able to power those cards, I know a 1000watt supply can run 2x 6990's. So you should be just fine.
post #3 of 14
Yes, it'll easy.

I would recomend 6990+6970 tbh.
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post #4 of 14
Should still be more than enough, grab an ammeter grab a spare PSU cable lying around slice it in half tape the 2 seperate halves with electrical tape, measure it, guesstimate the wattage input wattage multiply by 0.80 and bam u got your total system output power ATM, then add your next card in and your all set, but in my opinion that looks like enough for your rig even with a 3rd 6970
    
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post #5 of 14
3 lighnings beat 6970+6990.

You should be fine as long as you have a solid psu.

850 can run 2 with no issues.
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post #6 of 14
Quote:
Originally Posted by Carlos Hilgert Ferrari View Post
Yes, it'll easy.

I would recomend 6990+6970 tbh.
doesnt work, both 6990 GPUs are cut down, and therefore not 6970 GPUs anymore, if they weren't cut down, it would have been the 6970 X2 but PCI-E standards wont allow that
    
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post #7 of 14
Thread Starter 
Thanks for the help so far! + rep to all.

Also, I do think 6990 + 6970 is a more efficient (albeit less powerful) way to tri-fire, but I already have 2 lightning cards right now so I don't want to have to go through the trouble of selling one and then trying to get one of the hard to find 6990s.

EDIT: I was just worried about the slightly increased draw of the lightnings over the ref 6970, but it seems to be OK.
Edited by JCPUser - 6/20/11 at 5:21pm
post #8 of 14
Just check max draw specs for the cards and continuous specs for the PSU, taking into consideration which rail(s) you're running cards off of (as well as any other parts taking power from them). So long as you're within specs, you should be fine. Just figure out the specs and do a little math and you shouldn't have any problems so long as your PSU gets some decent intake air.
Edited by ff02 - 6/20/11 at 5:34pm
post #9 of 14
Thread Starter 
Quote:
Originally Posted by ff02 View Post
Just check max draw specs for the cards and continuous specs for the PSU, taking into consideration which rail(s) you're running cards off of (as well as any other parts taking power from them). So long as you're within specs, you should be fine. Just figure out the specs and do a little math and you shouldn't have any problems so long as your PSU gets some decent intake air.
Yeah, I can do the math. The problem is that I don't think the each card will actually pull 270W. They should pull somewhat less unless you are in Furmark.

On that topic, I know that the theoretical maximum performance boost from adding a third card is 50% (thus perfect tri-fire scaling is 250% of one card). Does that mean that the third card's TDP should be taken as half of 270W or 135W? If that is the case then 1000W is truly more than enough

Thanks.
post #10 of 14
You could run 3 6970's on a quality 650w psu,like the Seasonic X660,no problem.
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