As you can see on the diagram above, the board requires a single six-pin and eight-pin power cables (Theoretical Max: 75W + 150W + 75W from the PCIe connector = 300W) even though it should operate with just two six-pin rails. Then again, if you purchase a performance product, it is expected that you'll have at least a 500W+ PSU where 8-pin connector is the norm.
Three phases are dedicated to feed the GPU (NVVDD-PH2, PH4, PH5), and dual phase is for driving the rest of the board - a couple of gigabytes of GDDR5 memory and 3rd party chips (NVVDD-PH1 and PH3).
NVIDIA Kepler power details revealed
Posted on Monday, February 27 2012 @ 20:39 CET by Thomas De Maesschalck