hst101rox :
It is odd. Why not put in a i7-6820HK unlocked mobile CPU in it and have it factory set to overclock it heavily? This laptop should be able to easily keep the overclocked mobile chip cool enough at full utilization and less power consumption still than the stock 6700K..
Strange than Intel still has desktop CPUs that take way more power for the same clcoksped than their mobile chips. Runs at a higher voltage? But nVidia's GPU for desktop and mobile are all about the same efficiency right?
I don't know why. But I suspect Intel/AMD's desktop CPUs will soon be running at or close to mobile CPU efficiency like nVidia has done.
Well, that would be bit difficult. You see laptops tend to have difficulties cooling mobile CPUs let alone the desktop CPU, which is another factor that makes this questionable. Even if cooling wasn't an issue, pushing clock speed up tends to increase power consumption significantly as well. The mobile chip is likely a higher quality piece of silicon, and overclocked to the same clock speed as the i7-6700k, it will likely consume a little less power, but it is hard to say how much. Even if it managed to reach the i7-6700k's clock speed while using 10 percent less voltage than the desktop processor, other identical mobile CPUs may not be able to achieve the same results as it will vary by yield. As such the company would have a hard to ensuring that they could ship systems with the factory overclock.
As for your other question, like I mentioned in the above paragraph, manufacturers use higher quality pieces of silicon on mobile systems usually. When they make silicon transistors, slight defects often occur, and the quality of a chip can vary greatly. For example, one of Nvidia's main chips at the moment is the GM104. It is used inside of the GTX 970 and GTX 980 and a few other products. However, none of these parts perform the same. Defects occur in the GM104 during production. Nearly flawless chips go into the GTX 980, while flawed chips that are partially defective are used in the GTX 970.
That is one example of how a manufacturer may use the quality of chips to cover a wider part of the market, but higher quality chips also tend to be able to run with less power, and thus are often used in mobile or enthusiast parts. Intel tends to produce only 4 or 5 main silicon chips, and use these to cover nearly the entire market. On a silicon level, the desktop and mobile chips aren't any different, but high end mobile chips tend to have the highest quality, so that they can consume the less power.