When overclocking, its necessary to stress test to determine the stability of any system. This is where cpu stress testing comes in. Prime95 is generally considered the best stress testing program for overclockers. When increasing clockspeed and voltage, errors can be introduced in a processor's output. Prime95 has a torture test mode which checks prime testing calculations against known results. A good way to run tests is to run a 15min small fft test on a certain clockspeed, and up the speed if there is no error. Once an error occurs at a specific speed, lower the speed and run a 30min test. If its stable, run a 2 hour test. If there is an issue, lower the speed again and repeat. If its stable, run a 24hour test. Any issues and the speed should be lowered, no issues for 24hours usually means that the speed is stable.
Prime95 can also join the distributed computing search for mersenne primes(primes of the form 2^n -1).
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