We are now able to find out what kind of power is being used by our test system and the associated graphics cards installed. Keep in mind; it tests the complete system (minus LCD monitor, which is plugged directly into an AC wall socket).
The other thing to remember is that our test system is bare minimum - only a 7,200RPM SATA-II single hard drive is used without CD-ROM or many cooling fans.
So while the system might draw 400 watts in our test system, placing it into your own PC with a number of other items means the draw is going to be higher.
This is where AMD manages to pull off some impressive numbers. AMD has finally managed to reduce its power quite a bit with the new 45nm process. In fact, it's even better than the Core i7 with the 940 version. How it scales we will see very soon in our extreme overclocking tests.