Prime95 Icon


Free Download 5.38 MB - Tested clean
Screenshot of Prime95 29.8, a prime numbing app for the Windows operating system.
Free Freeware
Mersenne Research
Windows 10 / 8 / 7 / Vista / XP
Apr 8, 2019
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Prime95 is a freeware prime number software app filed under benchmark software and made available by Mersenne Research for Windows.

The review for Prime95 has not been completed yet, but it was tested by an editor here on a PC.

If you would like to submit a review of this software download, we welcome your input and encourage you to submit us something!

An extensive CPU stress test which searches for prime numbers

Prime95 is a program which searches for very large prime numbers. It has become extremely popular among PC enthusiasts and overclockers as a stability testing utility. It includes a "Torture Test" mode designed specifically for testing PC subsystems for errors in order to help ensure the correct operation of Prime95 on that system, but can also be used to stress test a PC.

People who are overclocking their system may use the torture test as an indication of the stability of their system. If your computer can run Prime95 for 24 hours without any errors, then you can usually assume that your CPU, and the parts of the motherboard which interface with the CPU and RAM, are stable and working well.

Prime95 on 32-bit and 64-bit PCs

This download is licensed as freeware for the Windows (32-bit and 64-bit) operating system on a laptop or desktop PC from benchmark software without restrictions. Prime95 29.8 is available to all software users as a free download for Windows 10 PCs but also without a hitch on Windows 7 and Windows 8.

Compatibility with this prime number software may vary, but will generally run fine under Microsoft Windows 10, Windows 8, Windows 8.1, Windows 7, Windows Vista and Windows XP on either a 32-bit or 64-bit setup. A separate x64 version may be available from Mersenne Research.

Filed under:
  1. Prime95 Download
  2. Freeware Benchmark Software
  3. Prime Numbing Software
Prime95 has been picked by our editors as very good.
Prime95 has been tested for viruses and malware.
We have tested Prime95 29.8 against malware with several different programs. We certify that this program is clean of viruses, malware and trojans.

Screenshots of Prime95 (6)

  • ASUS PC Diagnostics Icon
    ASUS PC Diagnostics 1.4.5
    Hardware diagnostics and troubleshooting for ASUS systems with stress testing for CPU, installed memory modules and video card
  • StressMyPC Icon
    StressMyPC 3.66
    Applies stress to your laptop or device in order to test the battery life
  • IntelBurnTest Icon
    IntelBurnTest 2.54
    CPU benchmarking NOT designed for novice users
Ranking in
Benchmarking Software
#10 of 45
4.2 out of 5 based on 14 ratings.

Benchmarking Downloads

  1. LinX A benchmarking tool for CPUs testing GFlops
  2. MaxxMEM2 Benchmark the memory (RAM) installed on your PC
  3. FurMark An intensive Windows-based OpenGL diagnostics tool
  4. IntelBurnTest CPU benchmarking NOT designed for novice users
  5. AS SSD Benchmark Measures the performance of install solid state drives (SSD)
  6. ThrottleStop A CPU benchmarking tool designed for Core 2 and Core I CPUs

Download Details

System Architecture:
Windows 10 32-bit, Windows 10 64-bit, Windows 8 32-bit, Windows 8 64-bit, Windows 7 32-bit, Windows 7 64-bit
Size on disk:
5,638,539 B
SHA256 filehash:
MD5 filehash: