I carried out the power consumption measurements using a special PSU. To create maximum load I launched FurMark 1.7.0 in stability check mode at 1920x1200 and Linpack x64. These two programs load heavily the graphics card and CPU, respectively, so we can determine the peak power draw of the whole system. You can see the results in the diagram:
Everything is normal here except for the results of the AMD Phenom II X4 platform overclocked to a CPU frequency of 4.1GHz. This platform needs a power supply with almost as much wattage as you need for the platform with an Intel Core i7 overclocked to the same frequency.