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Prime95 (x86)
SPS by mrx

Version: 30.19.1b20
Release: 2024-06-02
Category: System - Stress Tests
Size: 7250Kb
Not stealth:
Publisher: George Woltman
Web site:

+++ Prime95 +++ CPU Stress / Torture Testing Prime95 has been a popular choice for stress / torture testing a CPU since its introduction, especially with overclockers and system builders. Since the software makes heavy use of the processor's integer and floating point instructions, it feeds the processor a consistent and verifiable workload to test the stability of the CPU and the L1/L2/L3 processor cache. Additionally, it uses all of the cores of a multi-CPU / multi-core system to ensure a high-load stress test environment. To maximize search throughput, most of Prime95 is written in hand-tuned assembly, which makes its system resource usage much greater than most other computer programs. Additionally, due to the high precision requirements of primality testing, the program is very sensitive to computation errors and proactively reports them. These factors make it a commonly used tool among overclockers to check the stability of a particular configuration. Prime95 is the official client of the Great Internet Mersenne Prime Search (GIMPS), a distributed computing project dedicated to searching for Mersenne primes. Although most of its source code is available, Prime95 is not free and open-source software because its end-user license agreement states that if the software is used to find a prime qualifying for a bounty offered by the Electronic Frontier Foundation, then that bounty will be claimed and distributed by GIMPS.

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