Source: http://www.engadget.com/2012/12/11/intel-atom-s1200-server-data-centers/
We often hear talk about the most powerful servers and supercomputers, but the most power-efficient are just as important. On that latter front, Intel has today announced what it claims is the world's first 6-watt server-class processor, the Atom S1200. That's a 64-bit system-on-a-chip designed for use in data centers, and it comes in three variants ranging from 1.6GHz to 2.0GHz, each of which support up to 8GB of DDR3 memory, eight lanes of PCI Express 2.0, and all the basic features an x86-based data center requires. Not surprisingly, going the Atom route also entails a relatively low up-front cost, with the processors starting at just $54 in quantities of 1,000. And Intel is naturally promising even bigger advances in energy efficieny for the future, including a "leap further ahead" in 2014 when it moves to 14nm manufacturing for low-power Xeon processors, and Atoms after that.
Source: Intel