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crossfire 7970s power consumption- kill a watt - Page 2

post #11 of 29
I can't tell what an oc'd 7970 pulls over an OC'd 680, because all of the review sites either vary in how they test it, the results are varied or they just give wonky results (one said the card was pulling well over 300 watts by itself?)

Anyways, black friday is coming up. If you're lucky you can pick up two 7970's on sale and have some cash left over for a new power supply, because why not? biggrin.gif
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post #12 of 29
Thread Starter 
I'm trading my 680s for 7970s next Tuesday, just wanted to know if i need to buy a new psu ahead of time
Edited by y2kcamaross - 11/6/12 at 6:27pm
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post #13 of 29
Thread Starter 
Quote:
Originally Posted by ZealotKi11er View Post

550W with HD 7970 @ 1.175v, 1.150v @ 1125Mhz.
3570K @ 4.6Ghz @ 1.35v
3DMARK11

that with both 7970s? What about at 1.25 volts and 1250 mhz if your cards can reach those clocks
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post #14 of 29
Quote:
Originally Posted by y2kcamaross View Post

I'm trading my 680s for 7970s next Tuesday, just wanted to know if i need to buy a new psu ahead of time


Subtract 600w from this, times typical factor of .85. This is running full tilt, narrowly avoiding OCP.


LL
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post #15 of 29
Quote:
Originally Posted by tsm106 View Post

Subtract 600w from this, times typical factor of .85. This is running full tilt, narrowly avoiding OCP.
LL

They started a new coal power plant down the road after you hit the power switch on that thing for the first time didn't they?
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post #16 of 29
Thread Starter 
Ugh, looks like this 750w psu isn't gonna cut it
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post #17 of 29
Dude what is with killing all the watt's?
It is kilowatt not kill-a-watt.
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post #18 of 29
Quote:
Originally Posted by y2kcamaross View Post

Ugh, looks like this 750w psu isn't gonna cut it

750W will be more then enough.
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post #19 of 29
Im running a 3930k @ 4.5 and two xfx 7970s @ 1200/1600. 2 x ssds, 2 x hdds, duel watercooling loops. Mine pulls just over 1000 w from the wall under aida64 stress test.
I had an 850w silentpro m2 before and had quite a few lockups and bsods.
Have since upgraded to a ax1200i and the system has been perfectly stable since.
Having a "just enough" psu, and taking into account regular inefficiency, will cause a rise in temps causing a further reduction in efficiency, bringing the true serviceable watts down even further.
My experience tells me, whenever going for a new psu, get the biggest one you can afford to allow for another upgrade cycle or two.
Spending an extra 100 or so now saves you from having to buy a complete new psu when you upgrade next time costing you much more than $100.
Always remember increased load for an extended time creates heat which in turn reduces efficiency further. Running a 10 minute stress test gives you an estimated power draw, but does not give you an estimated reduction in efficiency due to heat.(cos it takes longer to develop) And this is even with badass cooling.

Do a weekend of full on gaming/add in some folding occasionally, and throw in a few hot summer days and a pc suddenly needs more from the psu than it can provide.

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post #20 of 29
^^Concur. I've blown my share of psus to know better now. All the you can do it on minimal watts lol. Who ends up paying for the losses, ie dead psu and the new ones? You do, the user, and there be the rub.
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