prime95 Woes....please help

Hardware Hub Overclocking
1

Ok so here we go, I am sorry if this is the wrong forum but it was all that suited prime95.

So I just finished my build and am using a FX 8350 NOT OVERCLOCKED with stock cooler on a M5A99FX Pro R2.0 motherboard. My RAM is corsair vengeance 1600- 8GB.  

I ran prime95 and my temps sat around 60-63 degrees Celsius.

But what was odd is when I started it around 30 seconds in, cores 7 and 8 failed.

Core 7 says: ERROR ILLEGAL SUMOUT

Core 8 says: FATAL ERROR: Rounding was 0.5 expected less than 0.4

I am stressing about it heaps. Are my cores faulty? Is it hardware? Software? 

Is my FX 8350 broken? 

Please help me! 

 

2

Whats your cpu voltage? can you take a couple of pictures of the bios/uefi?

3

No prime95

https://dl.dropboxusercontent.com/u/63152939/No%20prime95.PNG

With prime95 running

https://dl.dropboxusercontent.com/u/63152939/With%20prime95.PNG

Its just CPU-Z as I didn't know what I should be taking pictures of in the bios.

4

earlier i read someone was trying to undervolt to lower temps, and when he got to somwhere around 1.2 cores started failing

so maybe try going into the bios and setting the voltage to 1.35 (generally what stock is) and see if that fixes it

5

I went into the UEFI bios for my asus MB and under CPU offset voltage it said 1.380V. 

I assume that is the correct thing to look under? Other wise it is as follows. 

CPU & NB voltage: Offset mode

CPU offset voltage: 1.380V

CPU/NB offset voltage: 1.200V

CPU VDDA Voltage: 2.504V

Is it my PSU that is giving bad voltages? Its a Corsair TX750M

6

Please set CPU voltage from offset to manual @ 1.38v, make sure turbo is off. Might even be worth pulling the cmos battery out an in, to wipe bios settings. Try turning cool and quite / all other power saving settings off.

Your Northbridge and vdda voltages and also your psu are fine.   

7

Ok, so I activated manual, turned off AMD core boost technology and disabled cool/n/quiet, so my voltage runs at 1.368 to 1.398 all the time. I ran prime95 again but this time, in stead of keeping around 61* it went to 65. I stopped it at 65 incase I would destroy my CPU but hey! None of the cores crashed! I am using the stock cooler so I assume that my high temps are from that?  

8

The stock cooler on the FX8350 is pathetic and people need to stop useing prime95 on cpu's its not coded for.

If you whant to run stabilty tests on newer cpus use AIDA64.

9

^ Cooper can you shed some more light on that? If prime95 isn't a good stability test then why is it THE stability test recommended on every major Overclocking forum. A source or explanation would be interesting, I use Aida64 as well it is a great utility.

10

Aida64 uses all of the instruction sets including the new ones in Haswell and Piledriver/trinity/richland cpus while Prime95 does not prime will allso draw more power than it is supposed to and can actually do more harm than good.

Prime 95 is a very old program and is not optimised for todays new cpu architecture's the last time it even had a update was dec 2012.