The most efficient AMD CPU is currently under development and it is based on the only 45nm single-core from AMD codenamed Sargas. The CPU based on it to remain at 20W TDP is branded as Athlon II 160U and it will work at 1.8GHz and comes with 1MB cache.

It comes in AM3 packaging and supports DDR3 1066 memory and the rest of the AM3 platform. The introduction of Sargas based ultra low efficient CPU will also mean the end of life for Athlon 2850e at 1.8GHz and 22W and Athlon 2650e with 1.6GHz and only 15W. They should EOL at the end of Q4 2009.

Both these CPUs are based on 65nm Sparta core. AMD will continue to ship last orders at least until Q2 2010 if not even further, but Sargas 45nm single-core is definitely the future of low power AMD single-core computing.