4 gtx 690 gpu render farm with only a 1200w PSU ?

The derp cat

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Jan 24, 2015
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Hello everybody,
I've just seen on youtube https://www.youtube.com/watch?v=Zw3vwCBOjQ0
they built a gpu render farm with 4 gtx 690, support by only a 1200w corsair PSU @.@
Well, every gtx 690 has max power consumption at 300w, 4 of them reach 1200w already.
So, this render farm will never run at full power ?
I don't think i'm smarter than the pc builder on that video, i'm just curious about it.
Please share your thoughts, any thought will be greatly appreciated.
 

VincentP

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No you are right, by any reasonable calculation of power usage this is running the power supply past its rated limits and asking for trouble if trying to run 4 x GTX 690 cards on a 1200W power supply.
If this is with a 130W CPU and a standard system of this size, I would allow for 1390W power draw.
Not wanting to run a supply past 80% of its rating, I would suggest a power supply (or supplies) with a +12V rating of at least 1740W or 145A.
As a single supply, that is only possible on 240V mains.
More common would be to use two supplies and power say two graphics cards off the second supply.
 

The derp cat

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Jan 24, 2015
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Thank you all for the answers.
So it's possible ( and safer ) to use two supplies ? Mr VincentP please can you link me to some threads so i can read the configuration of that setup ?
 

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