This program is used to find Mersenne Prime numbers. You can visit the official site for a description of Mersenne primes. In addition, Prime95 can be used to stress test the CPU, memory, caches, CPU cooling, and case cooling. The torture test runs continuously, comparing your computer's results to results that are known to be correct. Any mismatch and you've got a problem! Moreover, Prime95 contains the benchmark feature, that times the program on several FFT lengths. You can then compare your computer's speed to others. It is also possible to download versions for Linux, FreeBSD, OS/2.
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