Its always worth watercooling. For one the VRMs are nice and cool, so low consumption, but on Nvidia GPU's, they will clock to the Max themselves. From what I have seen, they will clock as high as they can, automatically. Cool them enough, and they will fly. Once you have a watercooling setup, its like a monitor, you keep it a few generations, so it sort of pays for itself. If you then get the ref card and WB for a few gens. With AMD, this gen, its almost the same. Almost.