Step-by-step Prime95 and mprime tutorials: running the Torture Test, choosing FFT presets, disabling AVX, and reading results on Windows, Linux and macOS.
Interpreting Prime95 Results: results.txt and prime.log Explained Quick facts: Prime95 30.19 build 20 records what it did in text files in its own folder, principally results.txt for test outcomes and related log output often referred to from the program’s files. A passing entry means the computed result matched the known correct result. A rounding error…
Prime95 Worker Setup: Workers and Threads Per Worker Quick facts: In Prime95 30.19 build 20, stress and GIMPS work is organised into workers. Each worker is an independent job with its own window on Windows, its own settings, and its own result lines. In the Test menu and the Worker Windows dialog you control how…
Prime95 Benchmark Mode: What It Measures and How to Read It Quick facts: Prime95 30.19 build 20 includes a Benchmark mode alongside the Torture Test. The Torture Test checks correctness under sustained load by comparing results with known answers. Benchmark mode instead times how fast your processor completes defined FFT work, which makes it useful…
Prime95 Portable: Run It From Any Folder or USB Drive Quick facts: Prime95 30.19 build 20 is portable by design. There is no installer for the standard Windows package, no administrator account is required for normal use, and the program keeps its settings and logs in the same folder as the executable. Extract the official…
Prime95 on Mac: The mprime Guide for macOS Quick facts: On macOS, Prime95 30.19 build 20 is a command-line program called mprime. There is no Mac GUI, no .app bundle, and no DMG installer. The official MacOSX package contains just a handful of files, centred on the mprime binary and its text documents. That binary…
Prime95 on Linux: The Complete mprime Guide Quick facts: On Linux, Prime95 30.19 build 20 is not a graphical program. The same code ships as a command-line program called mprime in the official linux64 package, p95v3019b20.linux64.tar.gz (5,912,959 bytes, SHA-256 listed on the download page). There is no Linux GUI to install. You extract the archive…
How to Disable AVX in Prime95 (prime.txt Settings) Quick facts: Prime95 30.19 build 20 can skip its AVX, AVX2, and AVX-512 code paths if you add settings to prime.txt, the configuration file in the Prime95 folder. The documented keys are CpuSupportsAVX=0, CpuSupportsAVX2=0, and CpuSupportsAVX512F=0. Since version 30.11, settings live in prime.txt; older guides that tell…
How Long to Run Prime95: The Official 6 to 24 Hour Guidance Quick facts: The only official duration guidance for Prime95 30.19 build 20 is in stress.txt, the guide written by the program’s author and included with the download. It recommends running the Torture Test for 6 to 24 hours. It also says unstable machines…
Prime95 Small vs Large vs Blend FFTs: Which Torture Test Preset? Quick facts: Prime95 30.19 build 20 offers four Torture Test presets plus Custom. Smallest FFTs test the L1 and L2 caches with high power, heat and CPU stress. Small FFTs test the L1, L2 and L3 caches with maximum power, heat and CPU stress….
How to Use Prime95: A Beginner’s Step-by-Step Guide Quick facts: Current version is Prime95 30.19 build 20, a freeware program by George Woltman for GIMPS, the Great Internet Mersenne Prime Search. Its main job is hunting for Mersenne primes. The Torture Test covered in this guide is a secondary use described in the program’s own…
