Here is another test in which the CPU voltage was significantly reduced (from 1001MHz/1135mV to 910MHz/1000mV).
This is less intended for power saving, but more for reducing the heat output/overheating, which can be a common issue.
Edit2:
(the undervolting is already included in the images linked in the original post)
Edit:
Test with PCMark for Android shows:
Undervolt:
- Points: 2387
- CPU max. 60°C
Default:
- Points: 2122
- CPU max. 73°C