2 gigabyte gtx 770 sli will 750 watt psu really be safe?

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baner711

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Aug 29, 2013
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Ive always been one to go overkill on the power supplies but would like to know if anyone has a similar sli config with a good 750 watt psu?I have a 3570k overclocked to 4.3 ghz and want to get a 2nd 770 and i will not be overclocking the gpu any further then they are already out of the box.I have a rosewill capstone 750 watt 80+ gold http://www.newegg.com/Product/Product.aspx?Item=N82E16817182073

If anyone thinks this is pushing it i might got ahead and just get the rosewill 1000 watt lightning
 
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cookybiscuit

No its not, that would mean Titan pulls 325w, which it doesn't. It's power consumption measured from the wall, 'Full System Draw'. This would include CPU, motherboard, hard drives, the power wasted by the PSU etc. I'm running a overclocked processor and 780 off a 500w PSU right now, I don't think if I added another I'd...
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cookybiscuit

cookybiscuit

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Total overkill, a good 700w would do it without a hiccup.
20834_power.png

Titan SLI pulling 650 from the wall.
 
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oczdude8

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no the gold or bronze ratings have nothing to do with how much power your psu can provide to your components.

The 80+ rating is how efficiently the psu converts AC power from the plug into DC for your pc components.

A 750W gold will draw less power from the wall than a 750W bronze, but they both provide a max of 750W.

A 1000W would be the best choice.
 
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oczdude8

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This is just gpu load. I found the same article, this is what they said under that graph you posted:
"SLI power consumptions was monumental hitting an average 650W but peaking occasionally to 720W so having a large PSU is a pre-requisite. We would recommend for a high end system taking two of these cards to be a minimum 1000W or higher"

http://www.vortez.net/articles_pages/nvidia_geforce_gtx_titan_sli,10.html
 
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cookybiscuit

cookybiscuit

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No its not, that would mean Titan pulls 325w, which it doesn't. It's power consumption measured from the wall, 'Full System Draw'. This would include CPU, motherboard, hard drives, the power wasted by the PSU etc. I'm running a overclocked processor and 780 off a 500w PSU right now, I don't think if I added another I'd suddenly need a 1000w PSU.
04-Power-Consumption-Gaming.png[img]
 
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oczdude8

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congratulations for having a unstable system.

When I said gpu load only, I meant that the power is measured when the gpu load is at 100% and cpu at ~0%.

How would they possibly measure just the gpu power from the wall?

expect those numbers to increase by about 150w when oced cpu is under load as well.

you are also probably putting more than 100% load on your psu, and it is bound to fail soon.

I still standby my opinion that 1000W is recommended and that 850W is the minimum. If you check other forum posts or even basic requirments from NVidia, it will match what I am saying.
 
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cookybiscuit

cookybiscuit

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Except it doesn't.

http://www.overclock3d.net/reviews/gpu_displays/gigabyte_nvidia_gtx780_sli_vs_gtx_titan_sli_comparison/9

That means combined load, and this is with a 3960X at 4.6.

Assuming the PSU is 90% efficient at that load, the system is pulling 630w, meaning in this scenario, even a 650w would do it.

Granted I wouldn't actually chance a 650w on an SLI Titan and 3960X setup, its far too close to maximum draw to be considered viable. But OP could run his system off a good 750w, its not up for debate.
 
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Alexxx704

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I know it has been a bit since this question was asked but I have to side with cookie here I am running 2 770's and a oc'd 4930k on a xspc raystorm water loop and only pulling 675-700 at the wall on maxed out burn in with 8 high performance fans and orange led light strip and uv led sunlight bar . I am running it on a EVGA SuperNOVA NEX 750w just fine.
 
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