"Our test system is a power hungry Core i7 965 / X58 based and overclocked to 3.75 GHz. Next to that we have energy saving functions disabled for this motherboard and processor (to ensure consistent benchmark results).
I'd say 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."
"Remember that these are peak / maximum wattages that we are showing. 2-way SLI was consuming a lot of power as well, roughly 550~575 Watts."
"Bear in mind that you are not looking at the power consumption of the graphics card, but the consumption of the entire PC. "