The CPU 100%! application was designed to be a program for making your computer's CPU usage go to 100%. It was originally made to view how hot the PC processor would get at continuous full load.

You also might find other uses, such as testing adjustable speed fans etc. It is free to download but if you like it you may donate a small amount to support future development.

Note you will have to run this program twice if you have a dual-core processor, four times if you have a quad-core processor.