Hello guys if you have note 3 (sm-n900) with Kernel -halaszk-UNIVERSAL5420- and want to undervolt your CPU I have found a stable voltage for undervolting, Use SetCpu, first of all set your CPU when you are playing huge games to avoid overheating to min.200 max1300Ghz.
If your device overheats after undervolting I recommend to use DVFS disabler.
200Mhz-700mv
250-750
300-775
350-825
400-850
450-875
500-925
550-975
600-1025
650-1075
800-750
900-800
1000-825
1100-850
1200-875
1300-950 or 975
250-750
300-775
350-825
400-850
450-875
500-925
550-975
600-1025
650-1075
800-750
900-800
1000-825
1100-850
1200-875
1300-950 or 975
If your device overheats after undervolting I recommend to use DVFS disabler.