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GTX480 SLI Question - Enough Power?

post #1 of 22
Thread Starter 
I want to get another 480 to run SLI but am afraid I don't have enough juice. Had to recently replace the PSU with a 850w and I see now that Nvidia recommends 900w.

Anyone successfully running two 480's with a 850w PSU?

System specs are below, CPU is OC'd on at stock voltages, GPU's will not be OC'd.
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post #2 of 22
Quote:
Originally Posted by Rage19420 View Post
I want to get another 480 to run SLI but am afraid I don't have enough juice. Had to recently replace the PSU with a 850w and I see now that Nvidia recommends 900w.

Anyone successfully running two 480's with a 850w PSU?

System specs are below, CPU is OC'd on at stock voltages, GPU's will not be OC'd.
ROFL, you're nuts. You have plenty of power. I run a GTX480 and a Sandy bridge build off of a 520 watt.
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post #3 of 22
Should be more than fine with the cpu overclocked with stock voltages and gpu not overclocked.
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post #4 of 22
Quote:
Originally Posted by munaim1 View Post
Should be more than fine with the cpu overclocked with stock voltages and gpu not overclocked.
Nonsense, overclock until it hurts. He has plenty of power.
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post #5 of 22
i thought it would be fine with even the gpu at 850 or something around there and i dont think the cpu not being at stock voltage would matter
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post #6 of 22
Quote:
Originally Posted by sccr64472 View Post
Nonsense, overclock until it hurts. He has plenty of power.
LOL, I know, I was merely pointing out that with his cpu overclocked with stock voltages and gpu not overclocked he has more than enough power, especially with that PSU. Which in turn means, that he can, as you said, overclock it till it 'hurts' lol
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post #7 of 22
Thread Starter 
Awesome, thanks for the info!
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post #8 of 22
I'm going to have to kinda stipulate a little on whole the "OC til it hurts" clause with 480's in SLI on a 850W PSU.

I would say, to be more precise, "OC until you start seeing the PSU having trouble regulating it's 12V circuit". Which is the equivalent of 'hurting' in this context

850W is NOT overkill for SLI GTX480's, to the point where you can completely throw caution to the wind in terms of your OC'ing. I've run that exact setup before, with my current CPU OC/OV'd just like it is now, I started seeing the 12V circuit dip down to 11.6 territory with the 480's at 800/1.075V, and that was just running Furmark, i.e. no stress on the CPU.

And as my sig says, the guts of my PSU are identical to those of the Enermax Revolution ... which is no slouch in the voltage regulation (or any other) department ... so it's not like I'm running some piece of junk "850W" unit.

So ... you actually do want to exercise caution and keep an eye on your 12V regulation, and if you see it dipping down significantly (esp. if you're just running a gfx test with minimal CPU load) ... don't push it any further.

People underestimate what power-hogs the 480's (esp. on air) turn into once you start cranking up voltage and clocks. The kind of heat they generate makes them very inefficient, and because of that, they can go WAAAAAY out of spec on their wattage draw, trust me. If you don't believe me, ask Grunion sometime about the time he was pulling 1100W at the wall with his 480 SLI setup
Edited by brettjv - 7/31/11 at 11:57am
    
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post #9 of 22

A GTX 480 max power consumption is about 320 Watts avg. Sometimes a bit higher. Two GTX 480's needs 640 Watts avg, 744 Watts full throttle. You'd still have room to over clock and bench are my thoughts with your current system specs I see. Your Corsair 850 is bronze rating certified and will be ok. Depends on your over clocks if 106 watts can run the rest of your rig at full throttle. Average usage and you'll be fine.

Like Brett said if you start to have issues back down on either GPU or CPU over clock, you'll be good to go again. Personally I'd back down on GPU over clocks first as you want your CPU overclocked so it dosen't bottle neck the stock 480's performance.

Here is a video showing Quad GTX 480's in a benchmark full throttle requiring 1488 Watts. Half that for GTX 480's in SLI. Watch the power meter max specs.


Enjoy that second GTX 480 as it's definetly going to bring you some kick arse performance together. Good luck bud.
     
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post #10 of 22
Quote:
Originally Posted by Arizonian View Post
Like Brett said if you start to have issues back down on either GPU or CPU over clock, you'll be good to go again. Personally I'd back down on GPU over clocks first as you want your CPU overclocked so it dosen't bottle neck the stock 480's performance.

Here is a video showing Quad GTX 480's in a benchmark full throttle requiring 1488 Watts. Half that for GTX 480's in SLI. Watch the power meter max specs.
I concur ... You NEED the CPU running as fast as possible to feed those beasts. However, I'm not sure you can assume dual-SLI will only pull 1/2 of the draw of quad-SLI. I'm betting it's more like 2/3. There is 'the rest of the system' to be considered here.

Honestly, on AIR, there's not really any good reason to OC 480's in SLI beyond what you can easily attain with a nice low voltage. They get SOOOO LOUD, and SOOO HOT if you really push them. And even bone stock, SLI 480's will chew up and spit out 99% of the games on the market, completely maxed out at 1920 resolution. Metro is about the only game that will challenge them, and to do so, you you have to max it completely out.

If I were doing this setup I'd max out my CPU, and put the cards at 1.050V and see what I could get out of them AFA an OC goes, and leave it at that. You shouldn't run into any PSU problems with the 480's at that voltage. And I wouldn't push the memory OC's much either, cause memory OC's are famous for heating up the card, which in turn will lower the efficiency/increase the wattage draw.
Edited by brettjv - 7/31/11 at 12:20pm
    
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