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3570K Failed to pass Prime Blend at stock Bios setting, Voltage issue? Red Flag?

post #1 of 10
Thread Starter 
Hi, I was running a Prime 95 Blend test(version 27.7, with SUM error checking & Round off checking enabled) to test my system at stock before overclocking. It lasted for 10 minutes at 3.6Ghz @ 1.14 V Core Voltage, then core 2 & 3 failed(roundoff error) back to back. Then the Core voltage rose up to about 1.16-1.17V and my other 2 Core is runned for another 20 min then Core 3 failed(rounding error). Core 1 is stil running, now fluctuating between 3.6-3.8 at 1.6V.

I have encountered this issue before, I was running Prime 95 under the same setting and Cores 3 & 4 failed back to back around 14 min into the test(3.6Ghz @1.14V all core), Core 1 & 2 run just fine at a V core of 1.16-1.18 for another hour without trouble.

System:
Intel i5-3570K
ASRock Z77 Extreme 4(All Bios setting stock except XMP-> set to DDR3-1600 to match my Ram's default)
So this means the all Voltage related settings are at Auto.

Corsair 4x4G Vegenance LP DDR3-1600(9-9-9-24) Ram, running at 1600Mhz, passed Memtest86 without issue.
PSU Seasonic X650 Gold , Power setting is High Performance and my 12/5/3.3V setting are all good.

Monitoring software running:
RealTemp & CPU-Z(this is taken right now but both have been running when I started the test)


So What is my issue and how should I go about fixing it? I plan on getting this fixed before actually OC.
Edited by sherlock - 9/15/12 at 4:46pm
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post #2 of 10
I think you should focus on the memory (memtest isn't reliable) since you get core failed and not blue screen.

Some ram needs a little more voltage than the auto setting on a few motherboards (mine is one of them).

Try setting the memory voltage on both channels to 1.53v. Run prime custom & set memory to 14000.

Then try to manually enter the timings (just the 9-9-9-24 part and leave the rest as is)
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post #3 of 10
Thread Starter 
Quote:
Originally Posted by eXXon View Post

I think you should focus on the memory (memtest isn't reliable) since you get core failed and not blue screen.
Some ram needs a little more voltage than the auto setting on a few motherboards (mine is one of them).
Try setting the memory voltage on both channels to 1.53v. Run prime custom & set memory to 14000.
Then try to manually enter the timings (just the 9-9-9-24 part and leave the rest as is)

So the Memtest86+ v4.20 I spent 90 miniutes on passing wasn't reliable? I did read that a few people with the same Ram had to set Dram Voltage to 1.6/1.65V else they fail Memtest 86+ in seconds, but mine passed without any problem).

And Why 14000?

Update: I stopped the test after 1 hr, Core 0 passed with no issue, 3.8 Ghz @ 1.15-1.16V Vcore.

So the TL:DR version of my 1 hour Prime 95 Blend run:
1-10 min, all core at 3.6Ghz 1.14 Vcore, 100% load, all fine.
10min: Core 1 & 2 failed(round error), Vcore increased to 1.15-1.16V, 3.6-3.8Ghz at 50+% load for Core 0 &3
31 min: Core 3 failed (round error), Vcore steadies around 1.16V, mostly 3.8Ghz at 25% load for Core 0
1hr 2min: I stopped the test, Core 0 no issue.
Edited by sherlock - 9/15/12 at 4:45pm
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post #4 of 10
trying to help you out based on what happened to me, replaced ram 3 times which all passed memtest but failed on Prime.
Turns out my motherboard's XMP auto settings used too little voltage on the C/D channels. I was advised by G.Skill to up the voltage to 1.53v and vwala, all is good.

btw, is your memory voltage 1.65v or 1.5v? just up it by 0.03v in either case and test.
Quote:
Originally Posted by sherlock View Post


.............And Why 14000?

Cause you have 16000MB which would leave 2GB for windows & you to use the system without lagging.
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post #5 of 10
Thread Starter 
Quote:
Originally Posted by eXXon View Post

trying to help you out based on what happened to me, replaced ram 3 times which all passed memtest but failed on Prime.
Turns out my motherboard's XMP auto settings used too little voltage on the C/D channels. I was advised by G.Skill to up the voltage to 1.53v and vwala, all is good.
btw, is your memory voltage 1.65v or 1.5v? just up it by 0.03v in either case and test.

Cause you have 16000MB which would leave 2GB for windows & you to use the system without lagging.

My Ram is 1.5V.
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post #6 of 10
did it work smile.gif?
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post #7 of 10
Thread Starter 
Quote:
Originally Posted by eXXon View Post

did it work smile.gif?

Passed a hour of Prime Blend after I upped Dram Voltage to 1.53V. For now it seems I am in the clear but I will run a couple more to make sure.

Passed another 45 min of Prime Blend, 1 minor thing thourgh, during certain tests(the first and third), I see my 3.3V/5.0V/12V voltage drop from their idle value, for 3.3/12V these value are still above their number, but for +5.0V it dropped to 4.992V, is this an issue?

Update: Passed another 1 hr Prime, this time with prime custom memory 14000MB. Seems like I am in the clear. Thanks for the help, +Rep.

The only thing you said I still don't get is manually enter the timing for Ram(9-9-9-24), CPU-Z/BIOS says my Ram is 9-9-9-24 already.
Edited by sherlock - 9/15/12 at 8:53pm
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post #8 of 10
Quote:
Originally Posted by sherlock View Post

.....The only thing you said I still don't get is manually enter the timing for Ram(9-9-9-24), CPU-Z/BIOS says my Ram is 9-9-9-24 already.

no need to do it smile.gif

Glad it all worked out. But just to be sure, run Prime95 again with the same parameters that had core failed issues "Blend test(version 27.7, with SUM error checking & Round off checking enabled)"
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post #9 of 10
Thread Starter 
Quote:
Originally Posted by eXXon View Post

no need to do it smile.gif
Glad it all worked out. But just to be sure, run Prime95 again with the same parameters that had core failed issues "Blend test(version 27.7, with SUM error checking & Round off checking enabled)"

Actually I runned my first 1 hr and 45 min of Prime 95 with that setting(Blend with SUM error & Round off checking and had no issue. I did another hour with your suggested Custom Test with 14000MB Ram. So it seems I will be alright.
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post #10 of 10
Quote:
Originally Posted by sherlock View Post

I see my 3.3V/5.0V/12V voltage drop from their idle value, for 3.3/12V these value are still above their number, but for +5.0V it dropped to 4.992V, is this an issue?

no it's fine.
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Overclock.net › Forums › Intel › Intel CPUs › 3570K Failed to pass Prime Blend at stock Bios setting, Voltage issue? Red Flag?