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GTX 580 SLI PSU

post #1 of 21
Thread Starter 
Was just wondering if a TX 850 v2 is enough for two GTX 580's in SLI. I also have my i3 550 OC'ed to 4.2 with a core voltage of 1.36v.
I've read around and some people say 850 is enough, and some say you need more then 850.

Also, will 850 be enough to allow me to overclock my cards as well? (Probably not going to, just want to know if I have the option to)
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post #2 of 21
Possibly not: http://www.guru3d.com/article/geforce-gtx-580-sli-review/4

Although Guru3D used Core i7 965, they used a 1200W PSU.

Check out the power consumption graph here: http://www.guru3d.com/article/geforce-gtx-580-sli-review/14
719 watts consumed under load.. might be getting a bit close with 850 for an entire system.
post #3 of 21
Based on my experience I have been able to SLI GTX 580s on 850W. Even if you overclock your GPUs it won't go very far unless you're under water anyway. But I am one of those people who always recommend 1kW or higher PSUs for high-end builds like these, just because I think it's worth it for the extra headroom.

Just make sure you have a quality and reliable power supply unit and you should be all good to go. thumb.gif
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post #4 of 21
Thread Starter 
Quote:
With 2-way SLI we noticed our power consumption for the cards peaked to roughly 719 Watts, that's quite something really, above two 480 actually which is strange to see with a card that supposedly has a lower TDP. Yet we also really need to mention that one of the boards used (engineering sample) had an older BIOS and that the power consumption on that board might be a tad higher as a result of it.

But let's take the worst case scenario just to play it safe:

Measured power consumption

System in IDLE = 237W
System Wattage with GPUs in FULL Stress = 719W
Difference (GPU load) = 482W
Add average IDLE wattage ~ 20W x2
Subjective obtained GPU power consumption = ~ 522 Watts

Doesn't this mean 850 will be enough? Also, a TX 850 v2 is a good quality unit correct?
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post #5 of 21
I'd say it would work fine but you'd be very borderline. You wouldn't be able to overclock the GPU's that's for sure. Personally i'd buy something with a bit more power. SLI 580's really needs headroom when overclocking them and the rest of the system, 900Watt+ is advisable.
 
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post #6 of 21
It should handle it fine. Your CPU might be a bottleneck though...
post #7 of 21
I've run 1000mhz+ 580 SLI on an 850 watt with no issues, you will be fine.
post #8 of 21
Quote:
Originally Posted by Relance View Post

Quote:
With 2-way SLI we noticed our power consumption for the cards peaked to roughly 719 Watts, that's quite something really, above two 480 actually which is strange to see with a card that supposedly has a lower TDP. Yet we also really need to mention that one of the boards used (engineering sample) had an older BIOS and that the power consumption on that board might be a tad higher as a result of it.
But let's take the worst case scenario just to play it safe:
Measured power consumption
System in IDLE = 237W
System Wattage with GPUs in FULL Stress = 719W
Difference (GPU load) = 482W
Add average IDLE wattage ~ 20W x2
Subjective obtained GPU power consumption = ~ 522 Watts
Doesn't this mean 850 will be enough? Also, a TX 850 v2 is a good quality unit correct?

Yeah, pretty much. And yes, TX850 is a great PSU. Pretty much any Corsair PSU is high quality and very reliable.
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post #9 of 21
Pretty sure that CPU will bottleneck the GPU solution...maybe worth digging around for definite.

850W would be enough. But I like to have a 20% headroom at the very least. Gives you wiggle room for future upgrades.
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post #10 of 21
Thread Starter 
Quote:
Originally Posted by naizarak View Post

It should handle it fine. Your CPU might be a bottleneck though...

LOL for sure its a bottle neck, I'm waiting on the ivy bridge to be released and then i'll upgrade. I just got a good deal on the 580's which is why I took it.

Booo. I just bought my TX 850 5 days ago as I was under the impression that it would be fine.

Do two 580's really need to be overclocked anyways? By border line, will my psu blow if I go under full load? Or will I be fine with stock speeds on the GPU's but leave my i3 OC'ed
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