Prime95 errors, what do they mean? Other software for testing, monitoring?

[mikeo01]

Hi I am fairly new to overclocking, I understand how to overclock, but I don't necessarily understand everything that Prime95 outputs.

A common error I get is:
FATAL ERROR: Rounding was 0.5, expected less than 0.4 or something similar. I have read this could be due to memory? Anyhow I always stop the test and reduce the multiplier on the CPU to avoid further problems.

What does this error code mean? What does this error mean?:

ILLEGAL SUMOUT Restarting test

Also what does small/large FFT test do? I suppose I need to see if an error is caused by heat, power, RAM or the CPU (too high overclock/not enough volts).

Are there any other stress testing for the CPU I can download? I want to make sure the overclock is good on my CPU. I stop the test after any error is output, not knowing if it is actually CPU related, so I never get to my highest overclock.

Need some good software to stress test the CPU just to make sure. Any other monitoring tools available would be appreciated.

[konrad13x]

Check this thread http://forums.anandtech.com/showthread.php?t=2195063 about stability tests and list of programs you can use.

Last time, when I overclocked my C2D E8400 to 4GHz and DDR2 combo, first I run Memtest for 12hr to check RAM, then Orthos in blend mode for 18hr. It took some time, but after that I had no problems with my gaming ring.

Error you are getting is probably due to too low voltage or too high multilayer.

[AlexGTR]

I use Intel Burn Test, i find it better than prime95 and cains the CPU and RAM alot harder.