Prime95

Prime95 30.19 B15

Mersenne prime search and processor testing

Prime95 searches for Mersenne prime numbers as part of the Great Internet Mersenne Prime Search (GIMPS). It can obtain calculation assignments from the PrimeNet server and return results, while allowing work to continue offline between connections. The program also offers intensive processor tests that are commonly used to check system stability under sustained load.

Prime95 30.19 B15 details

Author:
License: Freeware
Price: FREE
Released:
File size: 71.60 MB
Downloads: 357
Keywords: prime number calculator, Windows 10, x64 software, prime number, gimps computing, processor stability test, mersenne prime search, Prime95, lucas lehmer test, mersenne, number, mersenne prime, cpu stress test, prime, stress testing, CPU benchmarking, find prime, Mersenne GIMPS
Author URL: https://www.mersenne.org/
Prime95 screenshot
Prime95OtherWindows XP, Windows Vista, Windows Vista x64, Windows 7, Windows 7 x64, Windows 8, Windows 8 x64, Windows 10, Windows 10 x64, Windows 11

User Rating: 2.4 (14 votes)

Windows 10

x32

Windows 10

x64

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Prime95 for Windows 10 - Full description

Prime95 is a computational tool for searching for Mersenne prime numbers, used by participants in the Great Internet Mersenne Prime Search (GIMPS) as well as by people interested in number theory. A Mersenne number has the form 2^p - 1; determining whether one is prime requires specialized calculations. Prime95 can test candidates and contribute computing work to the distributed search, where many computers help investigate numbers that would be impractical to check on a single machine.

The program can connect to the PrimeNet server to receive assignments and submit completed results. It performs the calculation locally, so a permanent internet connection is not required: a user can connect to obtain work and report results, then run computations while offline. This makes it possible to contribute from home or from a computer with intermittent access. Prime95 handles the mathematical work and communicates findings back to the search when a connection is available.

Prime95 also includes computational stress tests, commonly used to check processor stability and expose errors under sustained load. Its intensive calculations keep hardware busy for extended periods, which can help identify instability after changes to processor settings or when evaluating a system. These tests are demanding and can increase processor temperature and power consumption, so users should monitor system conditions and stop a test if temperatures or behavior become concerning. The stress-testing use is separate from the goal of finding new prime numbers.

The software suits volunteer computing participants, mathematics enthusiasts, and technically experienced users who want to examine processor stability. Those joining GIMPS can let Prime95 work on assigned candidates and return results; users focused on hardware can run its tests without taking part in the search. Prime95 is freeware for Windows, including Windows 10 and Windows 11. Its calculations can place a sustained load on the computer, and performance depends on the processor and the work being performed.

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