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Prime95 FATAL ERROR

Last response: in Overclocking
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September 26, 2011 3:05:01 AM

Hi, I was overclocking my phenom ii x4 965 BE (at 3.8ghz so far) and prime95 gave errors on 2 workers, 1 and 4, and it keeps giving errors on the same workers every time I start the blend test, the error is:

FATAL ERROR: Rounding was 0.5, expected less than 0.4

This error shows up on worker window 1 and 4 right when I start the blend test. What is wrong?


EDIT: Now it's happening on 2 and 4...

More about : prime95 fatal error

September 26, 2011 3:18:53 AM

More voltage and better cooling :) 
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September 26, 2011 3:21:08 AM

Andriko_08 said:
Hi, I was overclocking my phenom ii x4 965 BE (at 3.8ghz so far) and prime95 gave errors on 2 workers, 1 and 4, and it keeps giving errors on the same workers every time I start the blend test, the error is:

FATAL ERROR: Rounding was 0.5, expected less than 0.4

This error shows up on worker window 1 and 4 right when I start the blend test. What is wrong?


EDIT: Now it's happening on 2 and 4...


Prime95 is doing what it is supposed to do when testing your O/C system. You have reached the point of instability your overclock is to high or you need more voltage to get stable again. The rounding means that the processor is running a test math problem, and the error is that the answer the PC gives is not matching the known answer.
IE your processor is corrupting data.
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September 26, 2011 3:27:20 AM

The Phenom II OC'ing tutorial at the link below may help you hone your OC? Voltages and temps are important as noted above but even when optimized you will reach a point where the system is no longer stable.

FWIW, OCCT may give you quicker stress testing. Once you've reached the limit, you can run P95 for 24 hours to confirm stability.

http://www.overclockers.com/forums/showthread.php?t=596...
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September 26, 2011 3:50:42 AM

Right now my bus speed is 240 MHz, cpu multiplier is 16, and the cpu frequency is 3852 MHz, the min and max temps are 35/54C, and the voltage is 1.38 idle, 1.392 on a work load

I am not seeing any signs of instability except this

By the way, what is the temperature I should stop overclocking at? My cooler is a Corsair H70
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September 26, 2011 4:27:18 AM

55C seems to be the max stable AMD Phenom II CPU temp for most CPUs. Some go a little higher but you're right at the thermal wall which probably explains the instability. You could try a little more voltage but your temp is likely to rise. See Dolk's guide as there are more settings to adjust other than just volatge. It's quite useful.
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September 26, 2011 4:36:58 AM

Ok, I lowered my nb freq from ~2740 to 2400MHz, and raised my HT Link speed from 1926 MHz to 2167 MHz, and the error doesn't show up anymore

My cpu has seen temps of 62 and has been stable 0_0, but when should I stop, a common temp I see to stop at is 62...

Although my cpu temp only gets that high when I am doing the blend test on Prime95, during stuff like 3dMark06 it only goes up to 50
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September 26, 2011 4:43:11 AM

62C is the limit under Prime 95/OCCT/Linpack with an X4 955.
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September 26, 2011 5:11:46 AM

With these temps should I move onto 4 GHz now that I've fixed my problem with the Prime95 errors?
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September 26, 2011 5:39:27 AM

All you can do is make a change and then stress test to see where your temps are and if the system is stable.
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September 26, 2011 6:05:34 AM

Which Prime95 test gave you the error?

If the Small FFT's test failed, the problem is most likely CPU settings. If the Large FFT's or Blend Test failed, the problem is likely to be memory settings.
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