Intel Extreme Tuning Utility (Intel XTU)

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This is Intel's overclocking tool for Windows PCs, mainly for use with its own CPUs. 
Intel XTU allows you to overclock your CPU, monitor the temperature, and stress test your computer, with a few other special features for Intel CPUs and Intel motherboards.

Furthermore, Intel XTU also gives you CPU utilization and temperature readings, which you can use to monitor the overclock's success and whether it is causing any performance issues.

Download: Intel XTU (Free)