CPU-Z is a free tool that displays detailed information on your computer's hardware. The main things that CPU-Z gives you information on are the CPU, the memory cache, the mainboard, and the RAM; each one has a separate tab with all the information related to it. You only have to run it to see your processor's name and model, detailed core information, core voltage, internal and external clocks, overclock detection (if its speed has been modified), supported instruction sets, memories...absolutely everything there is to know about your CPU. The uses you can give it are very ample, it can, for example, come in very useful to know the exact model of RAM memory you have in case you want to replace it or expand it with additional modules which must be of similar characteristics if you want to connect them with Dual Chanel. You can also use CPU-Z to check your system's stability while changing speeds and voltages when overclocking as you must pay special care and attention to the temperatures each one of the components reaches.