I received my i7 UHD on monday. My current system is a SurfaceBook2 13" with I7 and a 3000x2000 screen and an nvidia dGpu which I never use or need. But they are nice systems to compare. I mostly use my laptop on AC power with an attached 4k monitor... with an extended desktop that means a lot of screen real-estate to feed. I'm a developer, not a gamer.
The first thing I noticed on the c940... noise! Definitely the fans and possibly coil whine. Fans mean temperature thus power consumption.. I'm still experimenting with "intelligent cooling" and "cool & quiet" power modes... i will NOT be using performance mode as i can't stand the whine.. Obviously switching modes makes a real difference.
I've since learned that Intel introduced Dynamic Tuning 2.0 for IceLake processors. Lenovo engineers definitely have some learning and tweaking to do on this machines powe management. Alas the tuning software is available only for OEMs...
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I'm using both cpuid HWMonitor and Intel Power Gadget 3.5 to monitor clocks, power & temps on both machines.
When typing this on my SB2 I every proggie closed except Chrome,HWMonitor and PwrGadget. thus basically idle with cpu <=5%
SB2 on AC with 4k attached.. PackagePower: 1-4W with a temp <=40c
c940 on AC sans 4k PackagePower 1-30W with temps from 40 to 80C. (Intell Cooling..) Even background apps that "push" the cpu for 2 or 3 seconds can kick the system into high gear with Fans going and temps shooting up...
That said.. with the right choice of cooling profile (Lenovo Vantage.. Intelligent Cooling OFF, Cool&Quiet ON) and Windows power slider to the lower settings I do get more than 6 hours of continuously binging vids.... on UHD. Be aware to turn off video processing.. that EATS power like a hungry hippo.
more to follow i think...