In Idle mode (CPU utilization <1%), my NUC6i7 is consuming about 19W average.
No matter how I set the TDP in the BIOS. Do you also have that ? I find this particularly high.
Yes, this seems to be normal. I guess you measured at the outlet. I'm seeing about 19W consumption there in idle. This NUC uses a 120W PSU. PSUs often are less efficient on the extreme ends (low or high load), so of those 19W maybe only 12W or so reach the NUC. There you have additional losses in the VRs etc. The package itself only consumes 3-4W or so in idle (according to the CPUs own estimation). That's why changing TDP in the BIOS doesn't change a thing. The power is spent elsewhere. Add about 1W for idle DRAM. Also on this NUC the PCH is not part of the CPU package (AFAIK) and also consumes power.
Your comparison with other NUCs (such as the 5i7) isn't that valid because those NUCs use a 60W PSU (which probably means better efficiency at the same low power point) and have an integrated PCH.
Other point where I'd like to have your opinon :
For an application, I need to limit the TDP of my NUC6i7 (to avoid heating and high power consumption).
For example, I've got following configurations that's working :
VR current limits : 40A
Package limits (sustained) : 15W
Package limits (Burst) : 25
Tau (window) : 14s.
These features are under-dimensioned for the NUC6i7. How can I make sure that this is stable ?
I let run a "torture test" with Prime 95 two days long and it seems to be sufficient for me.
For your TDP changes: I wouldn't change the current limit. It's enough to change the PLs. No need to test stability. You configured the package down. It cannot become unstable because of that. It will just throttle clocks to try to maintain the limits. Because of cooling system inertia, I think you could get away with a higher burst limit (PL2), improving performance for spiky work loads.
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The power consumption of the NUC is variable; it depends of all the hardware installed on the kit. Now, the processor of the 6i7KYK requires almost the double of the power of the 5i7RYH, it has a quad Core processor with better graphics performance.