Brief Prime95 Tutorial for use in dealing with CTD's:
I don't know if this will be helpful, but this information has been very helpful to me in the past, both with my machines and my client's machines. So here goes.
If other people can duplicate the crash, then it's the software's problem.
But, if only one machine is crashing and no other machine crashing, like I had happening to my machine at one time about a year ago, then the program Prime95 will help you to determine what part of your machine might be the weak spot.
You install Prime95, a free program, and run it and tell it that you are just benchmarking. Then you run the torture test that uses the most power and produces the most heat. The program runs your machine through complex calculations and then every minute or so checks the results with a built-in table. It checks the results that your machine is producing against the known values. If it doesn't check out, the program quits and reports that there is a problem.
If your machine is NOT Prime95 stable, then you have a problem. You can run the test for hours if your machine is Prime95 stable, and then you are not likely to get CTD's due to hardware issues.
But, if Prime95 stops running in a couple of minutes, then that tells you one of a few things:
1) Your CPU is buggy or damaged, very rare now, but common back at the Pentium stage where this program was first being developed and used.
2) Your CPU is not getting enough voltage. Up the voltage a notch in the CMOS and test again. If the thing runs for 15 minutes to an hour with the same results as the tables or known values, then the CPU is now calculating properly and it is now Prime95 stable. This is actually a critical process for those unlocked processors that you are trying to overclock. You have to make sure that the CPU is getting enough voltage, or the prime number calculations won't check out and the thing won't be Prime95 stable. When doing a custom setting on an unlocked processor, Prime95 helps you find the right voltage, not too little and not too much. Too little voltage, and it crashes to desktop, and too much voltage and the CPU runs hotter than it needs to. I use MotherBoard Monitor, another free program, to keep track of the heat produced while running Prime 95. Overheating can cause CTD's and can make a machine so that it is not Prime95 stable.
3) If the Prime95 benchmark quits on you after a couple of minutes, then it could also mean that your power supply is on the fritz or not producing clean power. With my old stock PSU, I had to run the unlocked processors .05 volts higher (two knotches higher) just to achieve Prime95 Stability. With a new Name Brand Enermax, I was able to drop the voltage down two notches and run Prime95 stable for half an hour or an hour, and the CPU runs stable and cooler.
4) If you don't have enough case fans or your CPU fan is not working optimally, then your machine's CPU or Graphics Card or motherboard can overheat and that can also prevent your machine from being Prime95 stable and cause CTD's. During the summer here, I get four times as many CTD's and most of them are due to overheating. If I can get my system Prime95 stable during the summer under the torture test that produces maximum heat, then I know that I have my fan and cooling in the case the way it should be.
Anyway, if your machine can't run Prime95 without it reporting errors, then that means that your machine is not Prime95 stable, and that means that the CTD's are due to your hardware. Something in your hardware is not right. Either you are overheating, or the CPU and motherboard are not getting the power they need. Usually if it is not Prime95 Stable, then you know in about two to 8 minutes of torture testing. The values your CPU calculates doesn't match up with the known values if your system is unstable and can't pass the Prime95 torture tests.
If your machine passes Prime95 tests and runs those tests for hours or even a half an hour, then you know that the CTD's don't have anything to do with your hardware, and then you can start looking at software drivers and CPU drivers and software programs for the cause of the crashes.
If your machine is the only one crashing, then Prime95 will tell you whether it is your Hardware or whether it is some other software.
If your machine is the only one crashing, and it is Prime95 stable, then it's either the program or the drivers you are using.
And, like I said at the beginning, if a program is crashing on other machines or on everyone else's machines, then you pretty much know that it's the software program.
You only need to start worrying about your hardware and your drivers if you are the only one experiencing the crash.
Edited by ThetaOrion, 04 February 2006 - 11:44 AM.