i7z is a wonderful tool if you are using a Intel Core i3, i5 or i7 CPU. It shows a whole bunch of information about each physical (not hyper-threaded) core of the CPU: its actual frequency, C-state and temperature. The frequency and C-state info is especially useful since these modern Intel CPUs use Speed Step, Turbo Boost and a lot of other technologies to get the maximum performance and minimum power consumption.

  • Installing is easy:
$ sudo apt install i7z
  • Usage:
$ sudo i7z

Use Ctrl + C to quit its interface.

Tried with: i7z 0.27.2 and Ubuntu 15.10

Core Temp

Windows 7 lacks a system tray utility that displays the CPU temperature. Core Temp is a tiny utility that can do this job nicely.

By default, it displays the temperatures of the different cores separately. To change this to a single number go to OptionsSystem Tray Setup and choose Show highest temperature of all cores.