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Power needs xfire 5850's ? - Page 2

post #11 of 40
I used to run crossfire 5850's ...with a i7-860. Crap load of drives and fans and two D5 pumps

I used a 750watt PSU...with 60amps on a single 12v+ rail (Silverstone 750 PSU) not that the single rail was a big deal...multirail is fine too. What I had was major overkill, but the amps on the 12v line is what you are looking for. If you found a 500 watt with a good 40 amps on the 12v rail I'd would say it is good to go.
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post #12 of 40
Thread Starter 
Ah , well, let me remember my physics class...
P=IV

Power draw for HD 5850 is 151W, says here http://www.techspot.com/review/206-his-radeon-hd-5850/

151 = I * 12

I = 151/12 = 12.58 AMPS per card.

So 26 AMPS for two cards, how much overhead for innacuracies/inneficiencies in supply ?

You say 14 more amps, or 168W, to cover the rest of the machine ?
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post #13 of 40
The problem with too little amps is not that big of a problem anymore only the crappy and the older PSU´s have that problem so if you buy a even a average modern PSU it sould have enough amps for your needs
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post #14 of 40
Thread Starter 
So now I'm thinking maybe a 550W will do, as long as it gives out what it says it gives out.

I'm starting to want one of those power meters you plug into the mains socket now, that would be real handy.
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post #15 of 40
I always say you sould pick a PSU that is 50 to 100 watts above your max power use
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post #16 of 40
Thread Starter 
264W each on two 12v rails - that would cover everything, yes ?

http://www.xigmatek.com/product.php?productid=115&type=specification
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post #17 of 40
Quote:
Originally Posted by dogbiscuit View Post

264W each on two 12v rails - that would cover everything, yes ?

http://www.xigmatek.com/product.php?productid=115&type=specification
OMG no stay away from that unholy abomination of a power supply
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post #18 of 40
Thread Starter 
Uh oh, what's wrong with it ?
Couldn't find a review for Xigmatek NRP-VC603, so I looked for the NRP-VC602 and it got decent reviews in Hardware Heaven and Jonnyguru.
Does 1 digit make so much difference ? 602, 603 ?
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post #19 of 40
As you said yourself you cant even find a review of it

If you cant do that then only the gods know who made the inside parts and not knowing that can be downright dangerous as you could end up with something that is cheap chinese trash

You could ask about it here http://www.overclock.net/t/183810/faq-recommended-power-supplies

But i would look at almost anything else
Edited by shilka - 3/21/13 at 7:16pm
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post #20 of 40
Thread Starter 
Didn't find anything bad about it either. Googled Xigmatek NRP-VC603 followed by "bad", "crap", "rubbish" and "fail" - found nothing on the whole of google.
I will ask about it there.
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The Watt Gobbler
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