i7z 0.28-0.1a41ff1 Thermal and C-state reporting on older Intel Core CPUs
i7z utility accurately measures the current frequency and temperature of older Intel Core (i3, i5, and i7) processors including the Nehalem, Sandy Bridge, and Ivy Bridge generations. Reliable support for newer CPUs is not guaranteed, as this package has not seen significant development since 2013.
If your processor is supported, you'll get detailed reports on Turbo Boost and clock multipliers, core voltage, and time spent in different C-states. This information can be viewed in real time and/or logged to a file.