The issue with power efficiency, speed, and price is that it's even harder to measure than transistor density. Furthermore, I think metrics that measure the tec

The issue with power efficiency, speed, and price is that it's even harder to measure than transistor density. Furthermore, I think metrics that measure the technological progress of the silicon manufacturing are a useful tool for enriching comparisons of chips. Yes, numbers like cache sizes (or transistor density) aren't what people ultimately need/want, they want speed, but it still helps them compare chips. Improvements of the underlying process alone could lead to improvements of power efficiency, speed, and price.