AMD Athlon 64 4800+ X2 Energy Efficient
 

The 4800+ is an interesting CPU. Energy efficiency is more and more important as the Green initiative makes computer manufacturers work on lowering power requirements and the 4800+ does this as advertised. The 4800+ consumes 30W less than the 5000+ under load, making it a good choice for the energy-minded in all of us.

http://www.motherboards.org/reviews/...re/1703_1.html