Do you leave your computer on all the time? If you've nodded yes to any of the above, it might be time to think about a more power-efficient processor. That's the idea behind AMD's Athlon II X2 240e. It's a 2.8GHz dual-core processor based on the AMD "Regor" core with a TDP of just 45W. The "e" behind the Athlon II X2 240e model name indicates that it's one of AMDs Energy Efficient processors. The Athlon II X2 240e has support for both DDR2 and DDR3 memory, depending on if the processor is dropped into a socket AM2+ or socket AM3 motherboard. Memory can be run at speeds of DDR2-1066 or DDR3-1333 via the Athlon II X2 240e's integrated memory controller.

http://admin.pcstats.com/articleview.cfm?articleID=2459