I'm interested to know how the power efficiency of the very latest cpu archtiectures is compared to say cpu's from a few years ago (i.e. sandy/ivy bridge/bulldozer architectures). It's good that AMD and Intel are both appreciating the need for energy saving measures. Running at full speed all the time is obviously an unnecessary power draw so it's good the cpu's downclock to save power but I wonder if the efficiency of these technologies are being improved with every generation as well.