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HX850W enough to handle 580 SLI 3GB Classified? - Page 4

post #31 of 40
He may be on to something here CSM, because that stupid Classy does use like 50watts more than the Lightning for 20Mhz more. It's apparently really inefficient in terms of clocks to power draw.
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post #32 of 40
750W can handle moderately OC'd reference 580's with a 2600k @ 4.6, so shouldn't a good quality 850W unit handle those (albeit power hungry) 580's with a 920 @ 4.2?
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post #33 of 40
I don't know enough to speak as if I'm experienced on the subject honestly, but according to Phaedrus's PSU calculator, he would either be right on the money or 25 watt over for a pair of 580s that each use 50 watt more than they should. The fact that it uses 50 watts more for no reason is so stupid.
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post #34 of 40
So it seems after all our useless bickering we agree with each other?
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post #35 of 40
Why do people respond to questions like this one (and this happens all the time, btw) with "I'd go for a 1000W unit!" as if the OP is asking what PSU wattage he should buy here ... like the guy doesn't already know that a 1KW unit would be a bit more optimal for his setup

The OP has stated that he already has an 850W unit, and doesn't want to buy a new one if the one he has will suffice.

Now, to answer the question ... yes that PSU will totally work for your proposed setup, esp. if you're not going to OV/OC the hell out of the cards, and then trying to run like Super Pi and Furmark at the same time.

Once installed, what I'd do is run some games, and do the following:
1) Buy a kill-a-watt and monitor you wattage usage, and remember to multiply that number by .85 to figure the actual DC draw. If .85 * (wattage on the kill-a-watt) is > 850W, I would become concerned, and
2) Keep an eye on the droop on your 12V+ rail using your favorite monitoring program ... if you're dropping down below about 11.5V at load I would become concerned.

Worst case scenario you won't be able to OV/OC the gpu's as far as you otherwise might. If I were you I would NOT drop your CPU OC to compensate though. You're much better off compromising some GPU clocks if necessary. You def. want as much CPU power as possible when running SLI 580's, IMHO.

I would certainly TRY w/your current unit. Worst case, your PC will simply shut off when you put it under a heavy load ... then you'll know you either need a bigger PSU, or that you need to find a way to lower wattage consumption. Also I wouldn't 'create' an artificially high load by running CPU and GPU torture tests at the same time ... this is a totally artificial consumption profile you'll never see in regular usage.

I ran GTX480's on my current rig for awhile, with small OC's (like 800/2000) and no OV, and it ran totally fine. I think you'll find that corsair 850W can handle what you're talking about
Edited by brettjv - 10/8/11 at 1:30pm
    
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post #36 of 40
even if you overclock the crap out of them 850w will beast it

dont listen to these money wasting noobs.

a quality 750 can even power your rig.
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post #37 of 40
agreed, you will be fine. I ran tri-sli Lightning Extreme cards with an overclocked chip to 5.0 and the cards at 990 core on a cougar 1000w....You will be fine with 850
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post #38 of 40
Thread Starter 
So guys I bought the EVGA 580 Superclocked+ SLI instead of the Classy's and I can say it works great on the HX850W so far!

Quote:
Originally Posted by brettjv View Post
Why do people respond to questions like this one (and this happens all the time, btw) with "I'd go for a 1000W unit!" as if the OP is asking what PSU wattage he should buy here ... like the guy doesn't already know that a 1KW unit would be a bit more optimal for his setup

The OP has stated that he already has an 850W unit, and doesn't want to buy a new one if the one he has will suffice.

Now, to answer the question ... yes that PSU will totally work for your proposed setup, esp. if you're not going to OV/OC the hell out of the cards, and then trying to run like Super Pi and Furmark at the same time.

Once installed, what I'd do is run some games, and do the following:
1) Buy a kill-a-watt and monitor you wattage usage, and remember to multiply that number by .85 to figure the actual DC draw. If .85 * (wattage on the kill-a-watt) is > 850W, I would become concerned, and
2) Keep an eye on the droop on your 12V+ rail using your favorite monitoring program ... if you're dropping down below about 11.5V at load I would become concerned.

Worst case scenario you won't be able to OV/OC the gpu's as far as you otherwise might. If I were you I would NOT drop your CPU OC to compensate though. You're much better off compromising some GPU clocks if necessary. You def. want as much CPU power as possible when running SLI 580's, IMHO.

I would certainly TRY w/your current unit. Worst case, your PC will simply shut off when you put it under a heavy load ... then you'll know you either need a bigger PSU, or that you need to find a way to lower wattage consumption. Also I wouldn't 'create' an artificially high load by running CPU and GPU torture tests at the same time ... this is a totally artificial consumption profile you'll never see in regular usage.

I ran GTX480's on my current rig for awhile, with small OC's (like 800/2000) and no OV, and it ran totally fine. I think you'll find that corsair 850W can handle what you're talking about
I don't have a wattage meter but I did check the 12V+ while gaming. It didn't went under 11.88V so it seems ok.

Anyway my 580 SLI (factory overclocked) works with my overclocked i7 CPU, so far! I'll notice when something dies
post #39 of 40
Click the link in my signature. A user just posted power usage with 2 580's in SLI. If you look at the numbers, you are more than fine
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post #40 of 40
The system in my signature pulled 650 from the wall during Metro 2033. You'll be fine I'd say.

Edit: wow I'm late hehe
Edited by Crest - 10/19/11 at 10:45am
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