Quick CPU is a program that was designed to fine-tune and monitor important CPU and System parameters such as CPU Temperature (Package and Core Temp), CPU Performance, Power, Voltage, Current, Core Parking, Frequency Scaling, System Memory, Turbo Boost, C-States, Speed Shift FIVR Control as well as making other adjustments. It is a free and open source CPU monitoring application that's professional and modern.
Here are some screenshots to illustrate the features and user interface of this application:
Desktop Info
MemInfo
Fan Control
System Information Viewer
OCCT