Check this. Max watts used is 173W for your CPU.
"Our test system is based on a power hungry Core i7 965 / X58 system. This setup is overclocked to 3.75 GHz.
Next to that we have energy saving functions disabled for this motherboard and processor (to ensure consistent benchmark results).
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."