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Stop recommending 650W-850W power supplies for single card systems - Page 26  

post #251 of 286
Simply writing to Phaedrus and asking him what to buy is not considered an exercise in the educational process. Source several places for the rated power consumption on your cards,and cpu (simply for the sake of accuracy throw the fans,and pumps,and hdd's in also) work the numbers through several wattage calculators. When you are done and you cant get an agreement within 100w let Phadreus know that your search is not working out, but that you did try.
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post #252 of 286
I just go off the 12v rail...watts is nothing. I've seen crap 650watts that have 30amps on a 12v rail and tons on the 3.3v and/or 5v.

If some one asks what PSU to use to say...crossfire 5850s I say a PSU that has at least 54 amps on the 12v+ rail(s). If it is a bigger card you just need to add a few more amps. Smaller, then subtract a few.

Single card setups don't ussually have too many questions about PSUs that I have seen. Though there I would prabably say 25-30 amps in a PSU that is under 600w. A strong 12v rail is a sign of quality in my experience.
Edited by Vagrant Storm - 6/17/11 at 9:22am
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post #253 of 286
Instead of circumspect PSU calculators, it probably would be best for users to post their wattage consuptions at full stress test with their rig. This way there will be different watts for the different systems. I know Gigabyte DES (Dynamic Energy Saver) does this and I found I was using a lot less watts then I had. (have to repost it when I am on the system)
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post #254 of 286
Quote:
Originally Posted by tedman View Post
Should be fine, those cards only use about 130-150W each under full load. The 300W figure you've seen was probably for the whole computer under load with that GPU installed.

Tri-6970s and your system won't pull more than 700W.
Pretty sure they use more then that.

I idle at around 305w. I disabled crossfire on my rig and ran furmark in windowed mode (checked it with msi afterburner to be sure only 1 gpu was in use) and my wattage with furmark was 520W or about 215W which is not counting what these cards use idle which iirc was around 27w. Normally i run my cards overvolted and heavily overclocked but for this test i put them back to the default voltages and clocks (default for my card is 925/1425)
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post #255 of 286
Thread cleaned. Please keep it civil guys!

Thank you.
    
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post #256 of 286
Quote:
Originally Posted by KusH View Post
I think we need a OCN PSU calculator.

That will stop all of the threads with will psu X work with this graphics card or this cpu/gpu combo.
and have most of the calculations point you to 650W-850W PSUs, especially for Single Card Systems.
   
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post #257 of 286
Quote:
Originally Posted by gerickjohn View Post
and have most of the calculations point you to 650W-850W PSUs, especially for Single Card Systems.
Well I meant to have a larger database of components (fans, HDD's, pumps, etc.)

That way you can more accurately predict a suitable PSU.

Unlike the one's that are available now that have very generic calculators that give you a very generic PSU estimation.
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post #258 of 286
Quote:
Originally Posted by ebsn View Post
Instead of circumspect PSU calculators, it probably would be best for users to post their wattage consuptions at full stress test with their rig. This way there will be different watts for the different systems. I know Gigabyte DES (Dynamic Energy Saver) does this and I found I was using a lot less watts then I had. (have to repost it when I am on the system)
How can we actually measure it? Does the DES from gigabyte consider overclocks?

Maybe I have to get some of those sensors from the wall?
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post #259 of 286
Not only do people need to learn how much power systems actually draw, but they should also learn that wall power =/ System power.....you gotta factor in the efficiency of your PSU which is in the 80's for most decent units. Its a big deal because if you are drawing 500W from the wall and your PSU is 80% efficient, the system is only drawing 400W....quite a large difference!
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post #260 of 286
I can't be bothered to read 26 pages, but. Um. What about the fact that it's more cost effective sometimes to buy a quality 650-700w with a single GPU then it is to buy a 500-550w and then when you're upgrading (cpu, gpu) you have to go out and buy another couple hundred watts more?

I dunno
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