Prime95 v27.9

Prime95 is a prime number crunching application that can be used to test the stability of your system.

It is very popular with the overclocking community, as well as PC enthusiasts. While the application crunches mammoth mathematical operations in search of ridiculously huge prime numbers (in the interest of research), it puts a lot of demand on the systems running the software.

Generally speaking, if you can run Prime95 for a long time without seeing stability or heat problems, then your system will have passed quite a stability test. You should not run a program like this for system testing purposes unless you are full sure of what you are doing.