To test power consumption today we are using a Keithley Integra unit and we measure power consumption from the VGA card inputs, not the system wide drain. The best way to get maximum load results is by using Furmark, and even though it is not indicative of a real world situation it shows the limits the card can theoretically demand. The ‘gaming’ results are measured when playing Crysis Warhead and is a more valuable result to take from this.
These cards consume very little when idle, around 13 watts each. When gaming we can see this rise to 128 watts, and then 172 watts when running Furmark stress test. These cards are consuming less power than any of the GTX460’s we have looked at to date.