It would be interesting to see the impact of temperature.
Some of the power consumption increase occurs because of a positive feedback mechanism - overclocking increases power consumption, which increases temperature, and higher temperatures increase power consumption, which increases temperature...
Sometimes you can significantly reduce the power usage of an overclocked processor by cooling it better - and this same trick does not work at stock clocks.
I was disappointed to not see the Core i5 750 part of this roundup because it seems to be the most power efficient/value CPU on the market today. When I buy, it's what I plan to get. I was glad to see the i7 860 reviewed, though, as I now know not to get it even if the price between it and the 750 is equal.
I also didn't quite understand the w . h graphs. The lower score is better?
Yes, lower is better. It basically measures the amount of power used to perform a task. Since slower performing processors take longer to complete a task they use more power to comlete the task. (instantanious consumtion X(times) the time needed to complete the task)
@5: If you look at the w/h graphs you will see that C2Q and the AIIX4 are actually the most power efficient processors. Did you read the article or do you commend out of what you already new?
@Ilya: Did you calculate the w/h over a period of time or only from the time it took to complete the task?