When Prime95 fails in any way, the very first thing you should do is run a memory test to rule that possibility out. MemTest86 is a very thorough memory testing program installation instructions here. If you have the other kind of CPU which accesses its RAM by communicating with a northbridge chip on the motherboard, then your CPU is probably the problem but the northbridge could also be responsible.
If you're not sure what to blame then you can try running only the "small FFTs" test. It does very few RAM accesses while running the test. If it fails, then it's very likely to be the CPU which is at fault. CPU overheating is a common cause of Prime95 failures. Prime95 pushes your CPU harder than almost all programs so it's entirely possible that it's much hotter when running Prime95 than any other program you run including games.
It's worth opening up your machine and making sure that your CPU heatsink and fan are working properly. I've seen drops of 5 degrees centigrate in Prime95 just by cleaning the dust out of a CPU heatsink. Modern CPUs use lots of power and they can get very hot if anything is wrong with their cooling system. Most computers come with monitoring programs which can display the current voltages and various temperatures in your computer. If you don't have one then you may be able to find a program on the internet which is compatible with your motherboard.
A free program which works with most hardware is SpeedFan. Motherboard Monitor is compatible with many older motherboards made in or earlier. You can use a monitoring program to check that your CPU temperature is reasonable. The temperatures reported by those programs are not all that accurate but it's still worth the trouble of comparing with other peoples' temperatures.
You can find them by doing an internet search on the name of your CPU and "peak idle temperatures". If you've built your own computer and know your way around your motherboard and its BIOS , then you have a few other options in dealing with a troublesome CPU.
One of the things you can try is increasing the CPU voltage. That will often stabilize a CPU in Prime Unfortunately, it also heats up your CPU and can shorten its lifespan. In fact, if you overvolt your CPU too much, you can easily destroy it. You can also try reducing the speed of the CPU. Front side bus frequencies, CPU multipliers, memory ratios, and that sort of thing are beyond the scope of this page.
But if you've been overclocking, you know what to do. Back off a bit on your overclock or GASP! People also occasionally can solve a Prime95 problem by overvolting or slowing down their RAM.
That's not very common if the machine can pass MemTest86 but it's been known to happen. If you're running out of ideas then give it a try. One of the less common reasons that Prime95 fails is an overtaxed power supply.
Most programs barely stress a modern CPU. And when they do, it's intermittently. When you do that, the power supply heats up. When some power supplies are pushed too hard, their voltages droop.
That usually causes the computer to crash or hang although occasionally it can just cause errors. If you have a fairly powerful video card made in the last few years, then it also draws most of its power from the 12 volt rail. A powerful video card draws much more power in 3D mode most games than when in 2D mode web browsers and word processors.
If your computer can run 3D games on a high-end video card without crashing then you probably don't have a power supply problem with the 12 volt rail and it is unlikely to be causing problems for Prime This is a high-end compressor cooler for up to watts heat input.
It's a modified version from industry and mostly used to cool the head of powerful laser cutters. Why I'm using this one? To show, which program is able to do it right. If you have additionally limitations from coolers, thermal throttling and other funny things, you will never see the exact difference. What did you guys put on the hotdog after testing?
A little mustard, ketchup, relish, sauerkraut? Good Job! I use Aida, Prime I may be forgetting a couple. But something has always felt a little off. I finally see what it was. Otherwise, you will need to address your question to one of the two people who wrote the program. 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 George Woltman , but please consult the forums first.
However, please do send bug reports and suggestions for improvements. 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 This file includes all the version Last updated: 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. 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. Home Get Started Why Join? Download Software Instructions.
Assignments Extensions Results. You are using the mersenne. The How it Works page answers many questions you may have before downloading the software. Older version history. The Gold Standard sort of speak seems to be 24 hours Whats never really talked about is the technical reasons as to why 24 hours is the Gold Standard? Is there an actual technical reason or is this just some arbitrary number that is been passed around the internet?
Is there an ideal amount of time that one should test the PC for? Most desktop rigs running Prime95 reach their maximum operating temp after 10 to 15 minutes; most overclocking failures will manifest themselves because thermals are what gets in the way of most overclocks. As long as I was willing to accept occasional hard crashes of my machine, I called an overclock "stable" if it lasted an hour on P Some custom-watercooled systems have quite a lot of heat capacity in the water, and take hours to reach maximum CPU temp.
Once I started doing tasks where accuracy mattered and crashes could cost me a day's computation or more, I started testing with P95 for 24 hr or more. Some failures, particularly RAM hiccups, manifest themselves very rarely. If I'm overclocking RAM to any settings more aggressive than SPD built-in settings, I run torture tests for 48hr or more to try to ensure memory is stable.
I used to test each separately in hopes of identifying the culprit for a failure, and found that two separately stable OC settings for cpu and ram could combine to make for rare crashes and data corruption.
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