Here is Guru3D's power supply recommendation:
#NVIDIA GTX 680 3 WAY SLI PC#
Again the Wattage shown is the card with the GPU(s) stressed 100%, showing only the peak GPU power draw, not the power consumption of the entire PC and not the average gaming power consumption.
So this is a calculated value, albeit a very good one.Ībove, a chart of relative power consumption. Mind you that the system wattage is measured at the wall socket side and there are other variables like PSU power efficiency. Subjective obtained GPU power consumption = ~ 509 Watts.
#NVIDIA GTX 680 3 WAY SLI FULL#
System Wattage with GPUs in FULL Stress = 649W.Measured power consumption three cards in SLI x3 Subjective obtained GPU power consumption = ~ 338 Watts.System Wattage with GPUs in FULL Stress = 473W.Measured power consumption two cards in SLI x2 Subjective obtained GPU power consumption = ~ 173 Watts.System Wattage with GPU in FULL Stress = 307W.We'll be calculating the GPU power consumption here, not the total PC power consumption. On average we are using roughly 50 to 100 Watts more than a standard PC due to higher CPU clock settings, water-cooling, additional cold cathode lights etc. Next to that we have energy saving functions disabled for this motherboard and processor (to ensure consistent benchmark results). Our test system is based on a power hungry Core i7 965 / X58 system. We however are not disclosing which application that is as we do not want AMD/ATI/NVIDIA to 'optimize & monitor' our stress test whatsoever, for our objective reasons of course.
We decided to move away from Furmark in early 2011 and are now using a game like application which stresses the GPU 100% yet is much more representable of power consumption and heat levels coming from the GPU. If we take a very-harsh-on-the-GPU gaming title, then measure power consumption and then compare the very same with Furmark, the power consumption can be 50 to 100W higher on a high-end graphics card solely because of FurMark. Furmark is so hard on the GPU that it does not represent an objective power draw compared to really hefty gaming. Note: there has been a much discussion using FurMark as stress test to measure power load. The before and after wattage will tell us roughly how much power a graphics card is consuming under load. We simply stress the GPU, not the processor. The methodology: We have a device constantly monitoring the power draw from the PC. Right we installed the cards so let's have a look at how much power draw we measure with these graphics cards active and running.
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