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AMD beats Intel on power efficiency

Research firm Neal Nelson reports that AMD Beats Intel in 36 of 57 Power Efficiency Tests. Nelson's firm has a long history of data processing consulting to some of the world's largest computer customers including the U.S. Army, U.S. Navy, the Internal Revenue Service, McDonalds, WalMart and Federal Express. Nelson's benchmarking laboratory is available to commercial and government users for independent computer performance tests.

You can download the white paper with more details:
Word Format or PDF Format

Also, there is an article published on Anandtech site. The "Low Power Server CPU Shoot-out". Again, AMD came out victorious.
AMD is clearly the leader when it comes to performance per watt using the workloads in this article. What is interesting to note is that AMD's advantage isn't at the processor level, but instead it's related to the fact that they don't use fully buffered DIMMs. Obviously, the measurements we took of each component aren't precise - it's just about impossible to do that (at least without sophisticated equipment). However, we can safely draw the conclusion that there is a lot more to power consumption than the CPU itself.

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