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Prime95

Prime95 is a freeware application written by George Woltman used primarily for stress testing CPUs and for searching Mersenne prime numbers as part of the GIMPS project. It uses the Lucas-Lehmer primality test and is popular among overclockers for system stability testing.
Latest: 30.19
Last checked: Jul 20, 2025 4:09pm
Rank: 6809/15140
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Overview

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License: Freeware (not open source)Winget: Available
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Version & Lifecycle

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Current: 30.19 Oldest supported: 1996 Avg cadence: Irregular

Tags

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stress testing benchmarking primality test freeware GIMPS CPU stability

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Also known as

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prime95

Notes

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Prime95 is also distributed as mprime for Linux and FreeBSD. It is sensitive to computation errors and uses hand-tuned assembly for performance. It is not fully open source due to licensing conditions related to prime discoveries.

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