Which motherboard are you using to obtain these results? *Also what are your thermals when under full current load?
Okay just saying, we don't know the actual % as it's a different board. But you are probably right.
I don't have a Skylake to compare with unfortunately 🙂
Edit: if you are saying the Skylake was IN THE SAME motherboard than your figures are valid. Otherwise you are comparing the CPU +GPU combination, Skylake Z170 vs Kabylake + Z270 (You never specified which mobo was used for the Skylake)
I isolated the EPS 12V line which doesn't supply ANY GPU or "chipset" power. 😉
VRM efficiency at these types of load is typically north of 85%. Even if you account very generously for a 10% swing, SKL will lose. Like I said, no mystery for me, but if there is for you, feel free to get your mitts on a SKL CPU and solve to put your own mind at rest. I await your results. 🙂
Hah, yeah I mean CPU + Mobo, total typo. I think it's no mystery that the Kabylake is more efficient, but by how much is still a mystery. (I'm not getting a Skylake now, I don't get paid by Intel or Asus 😉
But the point is in scientific experiments, you should compare apples to apples wherever possible. This is not about anybody getting personal or ego's, it's just reality.
Nothing stopping you if there's a mystery you'd like to solve. 🙂