Tom's Hardware Guide Clock

Tom's Hardware Guide Clock is a lightweight cross-platform utility designed with a single goal in mind: to help you detect dynamic overclocking, which may increase the power consumption of the CPU and generate more heat.
Since this is a portable program, it is important to mention that it doesn’t leave any traces in the Windows Registry. You can copy it on any USB flash drive or other devices, and take it with you whenever you need to check if your system is running above its operating frequency.
Tom's Hardware Guide Clock sports a simplistic interface that packs only a few configuration settings to tinker with. As soon as you run the program, it automatically displays the clock rate in the primary panel.
The application comes packed with different methods for generating the frequency at which the CPU is running. It is possible to perform a single test, or use up to three alternative timers for recording the CPU activity.
Since there are no other configuration settings, even a rookie can make the most out of ever single-built feature. On the downside, the program is only able to measure the clock rate of the CPU, so it doesn’t offer details about core temperature and package power.
Tom's Hardware Guide Clock offers support for up to three logical core monitoring processes. During our testing we have noticed that the tool remains light on the system resources, so it doesn’t hamper computer performance. Plus, you can move the small window to any area of the desktop.
All in all, Tom's Hardware Guide Clock offers a simple software solution for helping you check the state of the CPU quickly and with minimum effort.