iuvolt
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i7-6700HQ results (on Dell 7559)
I've tried to experiment with this a bit and -150 -150 -150 seems to be stable on this CPU. (-175 is not so much)
On 100% load:
Temps drop from ~82C to ~66C (And the cooler also spins slower)
Package power usage drops from 38W to 27W
sysbench --test=cpu --cpu-max-prime=20000 --num-threads=8 run
Gives the same results
All in all, this is a really good way to lower your temperatures and power usage.
s-tui was used to monitor the wattage and temperatures.
System: 4.16.3-1-ARCH