Prime95 FATAL ERROR: Rounding was 0.5, expected less than 0.4

[thegrox]

After running a Prime95 Merged test, in under a minute this error occurs for my 8th worker only. Is this a sign of a broken CPU that needs to be replaced or can this be fixed as i believe it is the cause of multiple BSODs. My CPU has not been overclocked. I have previously tested my RAM cards with memtest and they did not give any errors if that helps.

Here is an image of what i'm talking about.
After trying the test again it happened to worker #6 instead of #8

 

[damric]

Typical computers are not built tough enough to run Prime95. What motherboard and PSU are you using to power that FX-8core?

 

[thegrox]

Typical computers are not built tough enough to run Prime95. What motherboard and PSU are you using to power that FX-8core?

I am using a Asus M5A97 LE R2.0 Motherboard with an 800W PSU.

 

[damric]

800W tells me nothing about quality of the PSU. Need to know the model.

The LE is a horrible board for the FX-8core. Very weak VRM design.

 

[johnbl]

Make sure the system does not have a overclocking driver installed, reboot to BIOS and update it or reset it to defaults.
I would also update the CPU chipset drivers for the motherboard also. Set your fans to max speed and rerun the tests while watching a thermal monitor program.

 

[thegrox]

800W tells me nothing about quality of the PSU. Need to know the model.

The LE is a horrible board for the FX-8core. Very weak VRM design.

Sorry, the PSU was a Novatech branded one, seen here http://www.novatech.co.uk/products/components/powersupplies/novatech/nov-psu800.html
The cooling during the test seems to be fine.

 

[damric]

800W tells me nothing about quality of the PSU. Need to know the model.

The LE is a horrible board for the FX-8core. Very weak VRM design.

Sorry, the PSU was a Novatech branded one, seen here http://www.novatech.co.uk/products/components/powersupplies/novatech/nov-psu800.html
The cooling during the test seems to be fine.

That is one extremely poor quality PSU. It's likely the cause of your problems. I doubt it is filtering ripple or regulating the 12v rail at all, which is making your low end motherboard's vrms do all of the work. Recipe for total catastrphic failure.

 

[thegrox]

800W tells me nothing about quality of the PSU. Need to know the model.

The LE is a horrible board for the FX-8core. Very weak VRM design.

Sorry, the PSU was a Novatech branded one, seen here http://www.novatech.co.uk/products/components/powersupplies/novatech/nov-psu800.html
The cooling during the test seems to be fine.

That is one extremely poor quality PSU. It's likely the cause of your problems. I doubt it is filtering ripple or regulating the 12v rail at all, which is making your low end motherboard's vrms do all of the work. Recipe for total catastrphic failure.

Is it possible this could of already caused damage to the CPU? Or do you think that replacing the PSU may fix this problem. For reference I was testing my CPU to see if it was the reason i was getting random 'WHEA_UNCORRECTABLE_ERROR' Blue screens.

 

[damric]

CPUs are very hard to damage really. What's happening is instability likely from high ripple. Replace PSU with quality unit.

 

[thegrox]

CPUs are very hard to damage really. What's happening is instability likely from high ripple. Replace PSU with quality unit.

Would you have any specific suggestion based on my current CPU? Sorry to be such a hassle.

 

[damric]

Something from tier 2 will be fine:

http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html

Choose your wattage depending on what graphics card you have.

 

[thegrox]

Something from tier 2 will be fine:

http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html

Choose your wattage depending on what graphics card you have.

Thankyou very much, one final question - If I do upgrade my PSU is it recommended that I also upgrade my motherboard (and if so any suggestions).

 

[logainofhades]

I would definitely change the motherboard. The MSI 970 gaming is a nice board for the money.

 

[bmacsys]

I would definitely change the motherboard. The MSI 970 gaming is a nice board for the money.

MSI typically uses the worst mosfets you can get- Nikos.

 

[thegrox]

I would definitely change the motherboard. The MSI 970 gaming is a nice board for the money.

MSI typically uses the worst mosfets you can get- Nikos.

i'm conflicted haha, what would you suggest which isn't too pricy?

 

[damric]

These are the more quality ones.

 

[logainofhades]

I would definitely change the motherboard. The MSI 970 gaming is a nice board for the money.

MSI typically uses the worst mosfets you can get- Nikos.

You are mistaking their low end AMD boards, like the 970a-G43 and G46. Their Gaming series boards are top notch.

 

[damric]

I would definitely change the motherboard. The MSI 970 gaming is a nice board for the money.

MSI typically uses the worst mosfets you can get- Nikos.

You are mistaking their low end AMD boards, like the 970a-G43 and G46. Their Gaming series boards are top notch.

I agree. I've had a couple of the higher end MSI boards and they are really nice. I wouldn't touch the cheap ones though.

 

[TheTymol]

Is new PSU solve problem? Please anserw I am very afraid of my compter with this error.

 

[logainofhades]

Is new PSU solve problem? Please anserw I am very afraid of my compter with this error.

Please do not necro old threads. The OP may no longer be tracking this. You stand a better chance creating your own thread, and possibly sending a PM to the OP. /closed