This is a good point.
"Nvidia’s 2016 cards are all powered by its new Pascal technology. Pascal replaces Maxwell, which was behind the GTX 9xx series and the Titan X. Nvidia’s headline claim about Pascal as a whole is that it’s three times more efficient than the previous generation, which is done both with computing improvements and a new design and manufacturing process.
Pascal uses a 16nm (nanometer) process, where Maxwell used a 28nm process. This means Nvidia can fit more transistors (the bits that do the computing work) into a smaller space while consuming less power, meaning the whole GPU is a lot more efficient and runs cooler.
In terms of clock speed, the Nvidia GeForce GTX 1080 will sit at 1607MHz but is capable of boosting to 1733MHz, which is a huge figure when you consider the maximum boost speed of the GTX 980 was 1216MHz.
All this is possible in a GPU that consumes just 15W more power than the GTX 980 (180W versus 165W), and operates at a lower maximum temperature (94C versus 98C).
Considering how much more efficient the GTX 1080 is, expect to see the trend of top-end Nvidia cards inside laptops continue."
Read more at http://www.trustedreviews.com/news/nvidia-geforce-gtx-1080-1070-pascal-specs-price-release-date#TdgqE0ZyrQmm85ul.99