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Free Mersenne Prime Search Software

Prime95 Version 30.19 build 20

Shred 2 — Unblocked Portable

Players can execute various tricks, including 360s, backflips, and manuals, to create massive combos.

is the ultimate browser-friendly version of the acclaimed mountain biking game Shred! 2 - ft Sam Pilgrim . It bypasses network restrictions to deliver adrenaline-fueled racing directly to your screen. Developed by ASBO Interactive in collaboration with world-champion mountain biker Sam Pilgrim , this title brings authentic mountain biking mechanics to gamers worldwide. shred 2 unblocked

A single window popped up in the center. No logo. No corporate branding. No "Accept Terms and Conditions." No logo

Never, ever land a jump without pressing . The game’s physics calculate fall damage based on the vertical distance traveled. If you jump off a massive cliff, you must hold Down from the apex of your jump until the moment your board touches the snow. If you let go early, your legs snap; if you hold it too long after landing, you are fine—there is no penalty for tweaking on flat ground. This gives you a massive

: Over 40 levels inspired by real-world MTB destinations.

Do not just hold down the accelerate key blindly. Release the gas when you are airborne, and press the accelerate/pump button the exact moment your wheels or board touch a downward slope. This gives you a massive, realistic speed boost.

"Unblocked" versions of browser games typically appear on sites aiming to bypass network restrictions (e.g., at schools). Availability changes frequently; search for “Shred 2 unblocked” to find playable mirrors. Note: many unblocked sites copy game files without authorization and may host ads or trackers.

Players can execute various tricks, including 360s, backflips, and manuals, to create massive combos.

A single window popped up in the center. No logo. No corporate branding. No "Accept Terms and Conditions."

: Over 40 levels inspired by real-world MTB destinations.

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.

From the most recent "stress.txt" file included in the download:

Today's computers are not perfect. Even brand new systems from major manufacturers can have hidden flaws. If any of several key components such as CPU, memory, cooling, etc. are not up to spec, it can lead to incorrect calculations and/or unexplained system crashes.

Overclocking is the practice of increasing the speed of the CPU and/or memory to make a machine faster at little cost. Typically, overclocking involves pushing a machine past its limits and then backing off just a little bit.

For these reasons, both non-overclockers and overclockers need programs that test the stability of their computers. This is done by running programs that put a heavy load on the computer. Though not originally designed for this purpose, this program is one of a few programs that are excellent at stress testing a computer.

The Prime95 Wikipedia page has an excellent overview on using Prime95 to test your system and ensure it is working properly. The tips presented there should be helpful regarding how long to run the torture test and provide a solid guideline on how long to run the Prime95 stress test.

Performing a stress test is simple:

Download the software and unzip the files to your desired location.
Run the Prime95 executable and select "Just Stress Testing" when asked.
The default options are sufficient to do a well balanced stress test on the system.

Upgrade Instructions for Existing Users

Download the appropriate program for your OS
Upgrade the software. Stop and exit your current version, then install the new version overwriting the previous version. You can upgrade even if you are in the middle of testing an exponent.
Restart the program.
Read WhatsNew.txt

Questions and Problems

Please consult the readme.txt file for possible answers. You can also search for an answer, or ask for help in the GIMPS forums. Otherwise, you will need to address your question to one of the two people who wrote the program. Networking and server problems should be sent to . Such problems include errors contacting the server, problems with assignments or userids, and errors on the server's statistics page. All other problems and questions should be sent to , but please consult the forums first.

Disclaimers

See GIMPS Terms and Conditions. However, please do send bug reports and suggestions for improvements.

Software Source Code

If you use GIMPS source code to find Mersenne primes, you must agree to adhere to the GIMPS free software license agreement. Other than that restriction, you may use this code as you see fit.

The source code for the program is highly optimized Intel assembly language. There are many more-readable FFT algorithms available on the web and in textbooks. The program is also completely non-portable. If you are curious anyway, you can download all the source code (37.7MB). This file includes all the version 30.19b21 source code for Windows, Linux, FreeBSD, and Mac OS X. Last updated: 2024-09-14.

The GIMPS program is very loosely based on C code written by Richard Crandall. Luke Welsh has started a web page that points to Richard Crandall's program and other available source code that you can use to help search for Mersenne primes.

Other available freeware

At this time, Ernst Mayer's Mlucas program is the best choice for non-Intel architectures. Luke Welsh has a web page that points to available source code of mostly historical interest you can use to help search for Mersenne primes.

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