The System Stability Tester is a freeware download for Linux, Unix, and Windows, that claims to test the stability of your system by calculating millions of digits of Pi in different threads, and comparing the threads for any disparities. You can also run the test on a single thread for benchmarking purposes.
It was originally developed as a system stressing and benchmarking tool for hardware overclockers, the System Stability Tester has since gone open source (licensed under the GNU public license) and more mainstream (e.g., by giving Windows users an easy executable install file).
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