Neoseeker has published a review of AMD's AM2 X2 4200+ EE ("Energy
Efficient") CPU

While it may not be of as much technical interest knowing that these are essentially standard Athlon 64 chips, for those who run clusters of folding boxes or have a requirement for a low-draw server setup, these chips may fit the bill perfectly. The reduced power draw will definitely lead to long term savings for those who will be running their systems under load for extended periods of time. Also due to the lower draw, the heat output of these chips will be less than their normal-volted brothers which will be ideal for those running HTPC setups who are concerned about noisy fans and space constraints.

AMD X2 AM2 4200+ EE Review