This is only partly true. Yes, we hit the heat wall, and what you say was true for a few years, but there have been a lot of other efficiency improvements. A si

This is only partly true. Yes, we hit the heat wall, and what you say was true for a few years, but there have been a lot of other efficiency improvements. A single core of 3-3.5 GHz M chip is vastly faster than a 4GHz Pentium 4, even not accounting for bandwidth (which is also vastly faster).