4th core fails prime95 after 50 minutes

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dbruce1990

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May 7, 2013
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Hi, I am making my first attempts at overclocking. I started prime95 small fft torture last and everything was looking fine after about 30 min, so I went to bed, to wake up to p95 throwing an error only on the 4th core and the rest were still running.

I have read a few different posts, some say voltage problem, some say ram, some say NBVID problem.

Everything seems to be working just fine except that 1 error in p95, but I know that means it's not rock solid, and I'm looking to get a 100% stable overclock.

my HT and NB are at 2500mhz i know this isn't ideal but I was getting bsod at 2000mhz.

i also read i don't want to go over 1.5v on my particular cpu, and it is already set to 1.48...I know the temps seem to be okay. I was getting bsod at 1.45, and reading that it usually means a voltage issue? I can't usually read the bsod error because when they do happen, it reboots too fast to read it...

Here is cpu-z: cpu,memory, and spd of my 2 different ram types(could that be a problem?) as well as load and HWmonitor window:
http://i.imgur.com/3wPChUA.png

CPU-z validator:
http://valid.canardpc.com/2809599

and cpu-z top 15:
http://valid.canardpc.com/search/search.php?psn=414d44205068656e6f6d28746d29204949205834203934352050726f636573736f72&sort=freq

and here is the prim95 window(still running atm):
http://imgur.com/PpvE4dT

I saw in a OCN forum saying to set voltages:
cpu/nb: 1.25
vdda: 2.5 or auto ( i left mine on auto i believe)
HT:1.2
NB:1.3
SB:1.2

Seting the NB to 1.3 turned the text red though, which kind of makes me nervous...it went back to white at 1.28 though? Should I try turning this down to 1.28?

I'm sure I am forgetting something important. I have only been reading on this stuff for a few days really, having watched a friend overclock his only prior (and not knowing wtf he was talking about....still don't fully =P)

Thanks, all you guys on this site are always polite and very informative, I appreciate it! I know there is multiple questions in there, but one answer is closer to understanding than none! :) thanks again

 
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ingtar33

ingtar33

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Dec 17, 2012
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ok.

i'm a fellow deneb owner so i can tell you what i think the problem is. It looks like you've not got enough vcore... generally if you have a failing core in prime95, and you're not blue screening it's a voltage problem.

It looks like you're FSB overclocking... and if you've got that much vcore going into the cpu you're probably at the limit of your overclock. Generally speaking FSB overclocking shouldn't suck up so much vcore even at it's highest limits. So you're pretty much 2 or 3 steps beyond the limits for the cpu.

I would scale the fsb back 5, and start to work the vcore down till you hit the min needed for such an overclock. you're at the limits for power you can shove into pretty much everything except your ram. and if it was a ram issue you'd be bluescreening, not failing a prime test.

That said... you CAN go over 1.5vcore... its just not advisable, some PhII can get up much higher, but it comes down to how robust your mb and cooling is. I will not suggest it though.

What temps are you pulling with all that power going through your system. and what is your motherboard?
 
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ingtar33

ingtar33

Glorious
Dec 17, 2012
9,017
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45,840


yep. i realised you were a non-be... and you're right, you can't change the multiplier. No harm really you can get some great overclocks on fsb. My PhIIx4 965be is on the SAME motherboard... crazy huh? I also perfered to FSB overclock it because it seemed to like the fsb overclock better then the multiplier overclock (i needed to shove a LOT of vcore into it for the multiplier overclock, i could accomplish the same overclock on FSB for a lot less voltage and a lot less heat).

Ok, your mb is robust enough to push the vcore over 1.5... so if you are hellbent to balance this overclock where it is, i'd give it 1 more bump up. Just keep a close eye on temps. Your cpu cooler will start to struggle soon. I found my temps really got out of control when i got my vcore over 1.5... so i just backed it off.

And only bump it one step. see if that stabilizes your prime95 testing. it should. though if you are at the limits of your cpu you might need to bump the vcore a lot more then 1 step to stabilize the system.

you probably don't need your HT/CPU-NB up to 2500, if more vcore doesn't work look into lowering these down to 2400 or 2300... too much speed on your CPU-NB/HT can unbalance the system a bit too... but i won't tell you to change it till vcore has been exhausted or you've stabilized the overclock. Once you stabilize your overclock, you can start to walk all the settings and voltages down to find the sweet spots.

Tinkering with an overclock can take weeks to get the whole thing to its "ideal" settings. once you got your cpu locked in you can play with the ram timings cpu-nb/HT to see how much more performance you can squeeze out. lots of fun still to be had.
 
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dbruce1990

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May 7, 2013
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Thanks for the swift responses, and sorry for the delayed response haha. Allergies are kicking my ass this year.

I ended up bumping my voltage to just under 1.5, My temps didn't look horrible, I can't remember exactly but they were definitely under 50*C. Though my voltage was reading OVER 1.5 even though my bios were set to UNDER 1.5v. It seems that it generally had a bit of fluctuation in the readings, but not up to .5v i think generally .1 - .3 flux. Everything was looking stable though, I was playing some games and ran p95 for about 45 minutes and nothing happened. I was able to game on it and browse the web etc all day. But then later I ran a longer test, and got bsod.

Ended up resetting to default bios this morning out of frustration (and mostly being sick haha), everything seems okay still.

I agree it's definitely fun haha, though I really don't see that much of a difference in performance, if any. Mostly just curiosity has lead me to this.

I am very curious though how people got my cpu, on the cpu-z site overclocked at 4815.3MHz lol and I'd really like to try to push mine over 4, but knowing that I am not gonna have to buy any new parts for my pc lol. Wouldn't that mean they would need a LOT more voltage than 1.5? also are those stable OC on that site? (http://valid.canardpc.com/search/search.php?psn=414d44205068656e6f6d28746d29204949205834203934352050726f636573736f72&sort=freq)
 
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ingtar33

ingtar33

Glorious
Dec 17, 2012
9,017
198
45,840


no... you can CPUID anything that loads into windows.

I was able to cpuid my deneb at 4.2ghz (probably could have at a higher number if i wanted) and that thing was pushing 60C in idle. it was so hot i turned the pc off right after getting the validation.

The way some people hit those 4.8+ numbers is they
1) don't have a stable oc, just one that will hold long enough to validate
2) bought a group of CPUs and tested them till they found one GOLDEN cpu. or
3) won the lottery and got lucky with a cpu

most 965 won't stabalize over 4.3ghz unless you've got some serious cpu cooling going on, and one heck of a robust motherboard. I can't even get mine to stabalize over 4.0, and my cpu cooling isn't good enough to use that oc on a day to day. I actually hit a wall around 3.8, and it took me a long time to get past it (for the 965, around 3.8ghz you need to start to play with your HT/CPU-NB and ram timings to stabalize any oc over that point)

once i figured out the golden settings to get past 3.8, i found i needed to tinker with everything for every step higher... and the temps kept jumping as i did. In the end i found my system was at it's most stable, coolest and benching at it's best (thats right, you can bench slower with a high cpu clock if your ram isn't timed to match) at about 3.74ghz. At that point my system was at it's best. so while it's a bit slower on the cpu side from the stable 4 i was getting, with the ram overclock and the HT/CPU-NB clocks, my system actually benches a little better, is a lot more stable and runs pretty cool.

so for my CPU that was the best speed for me. only took me 3 weeks of playing/testing and experimenting to find the sweet spot.

Now other people with a 965 will have other overclocking stories, because every cpu/mb/ram/psu is different. So every overclocking story will be different. Don't look at what others got, go with what you've got, and play with it enough to know the ins and outs of your cpu, and know you've got the best you'll get from it. Then sit back and be happy.
 
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