Usually Prime95 will detect an error within a matter of minutes if an overclock is not stable, however many people like to let the system "burn-in" overnight to ensure long-term stability. FPrime95 is a small and easy to use application that allows you to find Mersenne Prime numbers. Mersenne numbers can be proved composite (not prime) by either finding a factor or by running a Lucas-Lehmer primality test.Prime numbers have long fascinated amateur and professional mathematicians. An integer greater than one is called a prime number if its only divisors are one and itself. The first prime numbers are 2, 3, 5, 7, 11, etc. For example, the number 10 is not prime because it is divisible by 2 and 5. A Mersenne prime is a prime of the form 2P-1. The first Mersenne primes are 3, 7, 31, 127, etc. There are only 40 known Mersenne primes. There are two ways to use this program. The automatic way uses a central server, which we call the PrimeNet server, to get work to do and report your results. Anyone with Internet access, including AOL, CompuServe, and dial-up ISP users should use this method. You do not need a permanent connection to the Internet. The second method is the manual method. It requires a little more work and monitoring. Recommended for computers with no Internet access or with some kind of firewall problem that prevents the automatic method from working.
Highlights of version 30.7 includeIntel Alder Lake support. Improvements to stage 2 of P-1, ECM. Added P+1 factoring.
Warning: upgrading in the middle of P-1 stage 2 will restart P-1 stage 2 from scratch
Highlights of version 30.3 includePRP with proofs. Eliminates the need for lengthy double-checking!!!
Resource Limits dialog box to control Prime95's resource usage. See the readme.txt file for setting these options
Highlights of version 29.8 includeAVX-512 support
Modified torture test dialog box with new options and better understanding of the L1/L2/L3 cache hierarchy
More robust implementation of Gerbicz error checking in PRP tests. This replaces LL testing as the default work type
Highlights of version 29.4 includeGIMPS has a new sub-project -- finding (probable) prime Mersenne cofactors
Like LL tests, PRP tests now support shift counts to aid in running double-checks
PRP tests now support a type of low overhead error checking that almost guarantees correct results even on flaky hardware
Because PRP tests are highly reliable, we now offer the option to do PRP tests instead of Lucas-Lehmer primality tests
For non-base-2 PRP tests, there is a new option to run each iteration twice and rollback if a mismatch occurs
Highlights of version 29.3 includeEnhanced error checking for LL tests
Faster step 1 GCD for ECM and P-1 factoring
Highlights of version 29.2 includeNew benchmarking routines to determine the optimal FFT code
Changes to default CPU cores assigned to each worker to optimize total throughput per system
Optimized FFT sizes for AMD Ryzen
The new code will now do multithreaded trial factoring
Faster factoring code using FMA if available
Improvements to the hyperthread core detection
Setup Instructions for New UsersJoining GIMPS is usually as simple as downloading and running the program, answering a few questions, and the program does the rest.
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Some Mersenne-related software has been written for NVIDIA and AMD GPUs, including:primality test (PRP): gpuowl
trial-factoring (TF): mfaktc (NVIDIA) / mfakto (AMD)
Legacy Operating SystemsMac OS X, GUI version29.8b72020-03-195.0MBp95v298b7.MacOSX.tar.gzRequires Intel CPU, Mac OS X 10.9 (Mavericks) or laterMD5: 5a110a0a5210fd10d7b8da0ce9ff43cfSHA1: 5a93d5f45dadd09b60520176f9abaead7c22d356SHA256: 3a0e228ea35bd96824163c7f5ab8e21502a33ae647752de3e5aab0f88fc7c52eMac OS Xpre-Mavericks27.92012-12-125.1MBp95v279.MacOSX.zipRequires Mac OS X 10.3 to 10.8 and an Intel CPU.MD5: 0390ae2ff3d4a7082927482d82e62f59SHA1: 5f08298fb4aff5dbbab3d072519cd80ecce576c1SHA256: c44e3bdae50d3360ec58a0efff47ccfdff5bdc5d31f669e2761da4737d5560d8FreeBSD 10: 64-bit28.72015-08-105.3MBp95v287.FreeBSD10-64.tar.gzRequires FreeBSD 10.0MD5: 5dd21b471946fdcb4858a9fa50fe718bSHA1: 5143e7e355f8fdbce5b3629cc9cd8d4e9bd04592SHA256: 0a04bb01524e7c10edce501f57e902b3ce9f82cda0e39aaae8bfaa1af95ab416FreeBSD 8: 64-bit27.92012-12-124.5MBp95v279.FreeBSD64.tar.gzRequires FreeBSD 8.0. May work on later versions.MD5: c6b1c84a79bb1b2e8366a81ddea0087cSHA1: 0f2972edb728a017b3bfe7da5cb7fddad7ed785cSHA256: 5ab9feddeb53fca9d9684119fae7ac271de3d85a4dd3c3f1fd26ab97ff71c05aFreeBSD 7: 32-bit26.62011-04-084.0MBmprime266-FreeBSD.tar.gzRequires FreeBSD 7.0. May work on later versions.MD5: d7e78a458b0c7ebbd6db57ff08835739SHA1: b283278dea4887494ebb7357992981ece8df3e08SHA256: d4c2c044cfa45311dd7f2c41574f59a0519c989fd6e0ca723505dea12b2ff1fdWindows XP: 32-bit29.8b62019-08-185.4MBp95v298b6.win32.zipMD5: 4f7d1cc7904d5d9ccb26c8c00b6470a9SHA1: 54dd8f9b4692d7a878626ac993562b83cb5587fbSHA256: cdd32b4c358869d3f588ae430bc67d9e88a5a69506002f864adac3c477c9202anon-x86 OSUnix and non-x86 users should check out Ernst Mayer's Mlucas page.
Start the program! Linux and FreeBSD users should run the program from the command line with a -m switch, i.e. ./mprime -mEnter your optional userID created on the website in Step 1, and optionally name your computer. We recommend Windows users select Options Start at Bootup or Start at Logon.That's all you need to do! The program contacts a central server called PrimeNet to get some work to do. Usually the program and PrimeNet know the best work to assign, but it's up to you!You can administer your account and computers on your userID's account page. Once you complete a workunit you can track your standings on thecompetitive stats pages the server updates every hour (see Top Producers in the menu, left, for more stats). You can monitor each of yourcomputers' progress, even remote-control the work assignments they request using your userID's CPUs page!Linux and FreeBSD versions can also be set up to run every time you restart your computer.Ask for help at the Mersenne Forum.
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 andother available source code that you can use to help search for Mersenne primes.
At this time, Ernst Mayer's Mlucas programis the best choice for non-Intel architectures. Luke Welsh has a web page thatpoints to available source code of mostly historical interest you can use to help search for Mersenne primes.
Prime95 is a bench-marking application used to test the power of your CPU, or processor.The utility of this program is great, putting your CPU to the test by finding prime numbers, numbers which are only divisible by 1 and themselves. This is a great idea for pushing a CPU to its limits by harnessing its processing power.By using Prime95 on a system, you'll find an excellent tool to test the performance level and stability of a CPU and by extension, a PC.As on of the top choices for overclocking enthusiasts and system tweakers, Prime95 is a good companion to heat up your PC and testing its limits by running it under experimental conditions, such as upping the clock rate and voltage. It can be ultimately useful to test whether cooling fans or water-heating are sufficient for high-powered gaming setups.The Torture Test feature of Prime95 is the best way to put your processor and memory to the test. This mode will run a succession of tests: Small TTS, In-place large FFTs and Blend. The latter being the most intensive of the three tests. Passing these tests means the PC is ready to go, but keep in mind that it could take an entire day for Prime95 to do its magic.As with any type of PC stress test, you should keep an eye on the target system and the temperatures.As a freeware tool, Prime95 competes with other applications like IntelBurnTest or CPU Free Benchmark but has come to be the gold standard. An online community of overclockers and other enthusiasts exist where users of Prime95 can share their test results with the wider world.All in all, Prime95 serves as the gold standard in system stress testing and bench-marking, making it an essential companion to anybody wishing to test the stability of their system setup.Compatibility and LicensePrime95 is provided under a freeware license on Windows from benchmark software with no restrictions on usage. Download and installation of this PC software is free and 30.8.17 is the latest version last time we checked.
Prime95, also distributed as the command-line utility mprime for FreeBSD and Linux, is a freeware application written by George Woltman. It is the official client of the Great Internet Mersenne Prime Search (GIMPS), a volunteer computing project dedicated to searching for Mersenne primes. It is also used in overclocking to test for system stability.[4]
Although most[5] of its source code is available, Prime95 is not free and open-source software because its end-user license agreement[3] states that if the software is used to find a prime qualifying for a bounty offered by the Electronic Frontier Foundation,[6] then that bounty will be claimed and distributed by GIMPS.
GIMPS has discovered 17 new Mersenne primes since its foundation in 1996, all using Prime95.[8] Each was the largest known prime number at the time of its discovery, except M37156667 and M42643801, which were discovered out of order from the larger M43112609.[9]
Highlights of version 29.8 includeAVX-512 support.Modified torture test dialog box with new options and better understanding of the L1/L2/L3 cache hierarchy.More robust implementation of Gerbicz error checking in PRP tests. This replace LL testing as the default work type.Highlights of version 29.4 includeGIMPS has a new sub-project -- finding (probable) prime Mersenne cofactors.Like LL tests, PRP tests now support shift counts to aid in running double-checks.PRP tests now support a type of low overhead error checking that almost guarantees correct results even on flaky hardware.Because PRP tests are highly reliable, we now offer the option to do PRP tests instead of Lucas-Lehmer primality tests.For non-base-2 PRP tests, there is a new option to run each iteration twice and rollback if a mismatch occurs.Highlights of version 29.3 includeEnhanced error checking for LL testsFaster step 1 GCD for ECM and P-1 factoring 2ff7e9595c
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