So heres your 2 options:
- Offset Mode: Your CPU will use VERY LITTLE voltage and speed when idling, ANYTIME you idle. (Even browsing can be considered idling.)
- Enhanced Halt State (C1E): Enabled
- CPU C3 State Support: Disabled
- CPU C6 State Support: Disabled
- Package C State Support: Disabled
- Fixed Mode: Your CPU will run full voltage and speed all the time, even when idling.
- Enhanced Halt State (C1E): Enabled
- CPU C3 State Support: Enabled
- CPU C6 State Support: Enabled
- Package C State Support: Auto
Which one is better?
Neither is "better". The first one will save you power and money, the second one will ensure you have 100% CPU power all the time. Some choose the 2nd option because they don't care about the electric bill and they like to have the best stability and power they can have. If, like me, you choose the 1st option, you will not be penalized.
Don't forget that each one can still use Sleep / Hibernate both of which will reduce the PC power usage to almost zero.