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3 way SLI on 750w? - Page 2

post #11 of 27
Depends on whether or not you want to roast marshmallows over the smoldering remains of your computer.

You would be overloading your AX750 by 100-150W depending if you overclocked or not. Which the AX750 can do, but probably isn't advisable. 890W before your AX750 will shut down, and you will be pulling close to that- around 800-850W.

http://www.kitguru.net/components/power-supplies/zardon/corsair-ax750-power-supply-review/4/
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post #12 of 27
Quote:
Originally Posted by Tom1121;12263170 
I say yes, and I won't be surprised when Phaedrus comes here and and says yes as well. Check these graphs by Guru3d, full system power with 580 3 way SLI is only 736 watt. FULL SYSTEM not just the cards. OP will be fine with 3 570's. I would maybe go with the 850AX for some headroom when overclocking though.

Yup..... you are going to need a new PSU. I would be looking at 1K + range of PSU's for future expansion and what not. However if you had a good 850 like the HX850 then, I would be saying yes you could.
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post #13 of 27
Even though I've caught flack for it in the past, I will say it again: you DO NOT want to run your PSU at peak output for extended periods of time. Think about it like this...you wouldn't run a car engine at 5k RPM all day every day, even though it can technically run that fast. It's just not designed for that. Sure, hitting the passing gear and tapping 5k for a minute or 2 won't hurt it, but you wouldn't want it to run that fast all the time. A PSU is no different in this regard. It can hit 750W+, but it isn't designed to run that way continuously, even if it says 750W continuous.
 
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post #14 of 27
It would probably work, but is closer than I like. I'd normally recommend at least an 850W for a system like this.
post #15 of 27
850 watt is all you need. 1000 watt if you plan on not running that PSU like a dog.

Also, your only going to be hitting 100% usage on those GPUs like, never? Only in Furmark, crysis, battlefield etc. you'll get CPU bottlenecked.

In FURMARK, expect 800 watt power draw, ish. 850 watt will handle it fine. 1000 watt if you want to put sound cards, physx, and have a quiet PSU.
Edited by SpeedNuggeT - 2/4/11 at 2:35pm
post #16 of 27
Dont know if it helps but I have tr-sli'd 260's slightly Oc'd in my Sig rig. I thought the 570 were a little more efficient?
    
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post #17 of 27
Quote:
Originally Posted by Tom1121;12263170 
I say yes, and I won't be surprised when Phaedrus comes here and and says yes as well. Check these graphs by Guru3d, full system power with 580 3 way SLI is only 736 watt. FULL SYSTEM not just the cards. OP will be fine with 3 570's. I would maybe go with the 850AX for some headroom when overclocking though.

Guru3D doesn't test Furmark because "blah blah blah we're wussies" so they don't actually have the maximum power draw of the systems they're testing, they just take the highest number through their entire benchmark suite. I don't like that methodology.

It's similar to watching a race, saying "Oh that car just hit 200MPH on that lap! That is the fastest that car can ever go!" and leaving it at that. No. That is not the maximum wattage the system will pull through its entire lifetime. The OP should go with a higher watt PSU even though an AX750 would handle it just so he has a more efficient PSU for the wattage he will pull.
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post #18 of 27
Quote:
Originally Posted by KittensMewMew;12263319 
Guru3D doesn't test Furmark because "blah blah blah we're wussies" so they don't actually have the maximum power draw of the systems they're testing, they just take the highest number through their entire benchmark suite. I don't like that methodology.

It's similar to watching a race, saying "Oh that car just hit 200MPH on that lap! That is the fastest that car can ever go!" and leaving it at that. No. That is not the maximum wattage the system will pull through its entire lifetime. The OP should go with a higher watt PSU even though an AX750 would handle it just so he has a more efficient PSU for the wattage he will pull.

I disagree. The vast majority of PC users (even gamers) aren't bench monkeys like many of us here at OCN. Guru3D uses the testing methodology of "what an average person will see". That's also why they usually settle for a less than max but still significant OC when testing OC'd performance. It's true that they don't push the hardware to the absolute limit, but neither do most users.
 
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post #19 of 27
Quote:
Originally Posted by Mr. Mojo;12263853 
I disagree. The vast majority of PC users (even gamers) aren't bench monkeys like many of us here at OCN. Guru3D uses the testing methodology of "what an average person will see". That's also why they usually settle for a less than max but still significant OC when testing OC'd performance. It's true that they don't push the hardware to the absolute limit, but neither do most users.

This. i like my stuff to last!
post #20 of 27
Thread Starter 
if I can get by with a 850 I would much rather that than a 1000w
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