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3930K Nuked by dust?

post #1 of 11
Thread Starter 
I had my 3930K 24/7 overclocked very stable* at 4.5GHz on 1.265V in a dust prone case (HAF 932).

Tired of buying canned air every couple weeks I finally invested in a Metro DATAVAC electric duster. The blower is quite powerful and I was able to clean my case like I never could with canned air.

To my delight, the thorough cleaning dropped the non-load average core temp. by 1-2 C. The problem is, my once modest overclock is now no where near stable and crashes in every stress test. I reverted to my once previously super stable overclock of 4.2GHz on 1.185V, and that's where I'm sitting at now.

My question is: could the dust storm created by the blower have caused an excess charge buildup on the motherboard or chip to have caused this sudden "degradation?" During the time of cleaning, the case was disconnected from all peripheral components and grounded in a well-ventilated area.

*Stable - 5 hr Prime 95; max temp. = 76 C; all idling options disabled (EIST, C1E, C3/C6); LLC (Loadline Calibration): 0-5%

Relevant specs:
ASROCK Extreme VI X79
16 GB Corsair XMS3; OC @ 1866Mhz

Other thoughts:
Though the blower is powerful, I find it highly unlikely I damaged anything delicate such as a capacitor.

The 4.2GHz OC is still as stable as ever. I've tried to go back to 4.5GHz, but with no such luck.

Thoughts?

UPDATE
Dust in the DIMM/PCI slots appears to have been the culprit of my problem. After a quick rebuild and re-clean of each slot, my rig now performs in stress testing just as it used to. It's amazing what impact dust can have on an OC. Thanks to all who helped me troubleshoot through this.

In case some are curious, these snapshots take place at approximately 1 hr of Prime 95, post-troubleshoot. I am attempting a 12-hr burn. I didn't realize this voltage was low for this clock and chip, but I'm happy my air cooling remains to be a viable solution.



Edited by jbac03 - 3/24/13 at 5:17pm
post #2 of 11
The only thing I could think of is dust getting into the RAM DIMM's. Were the sticks sitting in the slots when you blew the dust everywhere, or were they out of it? Bad RAM as we all know can kill an overclock.
    
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post #3 of 11
Maybe a teardown is in order? I find it hard to believe that a datavac would cause something like that. Anything is possible, but I would at least start with a bio reset and re-tweaking then head onto a tear down and rebuild and then retest.
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post #4 of 11
Thread Starter 
Quote:
Originally Posted by karmuhhhh View Post

The only thing I could think of is dust getting into the RAM DIMM's. Were the sticks sitting in the slots when you blew the dust everywhere, or were they out of it? Bad RAM as we all know can kill an overclock.

Yes, I did not remove the sticks. (4 of 8 slots are occupied with this kit)

I suppose I could drop the memory back to 1600 Mhz and see what happens.
post #5 of 11
As others have said i would clean out all your ram dimms, ram slots and pci slots.
post #6 of 11
It's possible that your previous OC wasn't really stable, but that you simply did not catch instability in your original testing. If you have changed or updated your settings, stress testing software, or any BIOS/firmware in the mean time, this could also be the cause.

It's not beyond reason that you could have damaged something, but you almost certainly did not damage the CPU.
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post #7 of 11
1.265v is LOW for a SB-E chip, it was bedding in. When you first get a CPU it has a bed in time when after a while it will need more volts to be stable.

Try more volts, keep it below 1.45v and temps below 80c. I see you at the limit already.
Edited by driftingforlife - 3/24/13 at 3:54pm
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post #8 of 11
i wouldnt consider 5 hours of prime "very stable", alot of times it takes 8+ hours to show instability. your overclock was probably just not stable to begin with and is now showing its signs. try adding some voltage and see how it does
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post #9 of 11
Thread Starter 
Quote:
Originally Posted by Blameless View Post

It's possible that your previous OC wasn't really stable, but that you simply did not catch instability in your original testing. If you have changed or updated your settings, stress testing software, or any BIOS/firmware in the mean time, this could also be the cause.

It's not beyond reason that you could have damaged something, but you almost certainly did not damage the CPU.

Quote:
Originally Posted by driftingforlife View Post

1.265v is LOW for a SB-E chip, it was bedding in. Try more volts, keep it below 1.45v and temps below 80c. I see you at the limit already.

The 4.5 clock speed had been running for nearly 4 1/2 months with the chip's first build just 8 months ago. This was the best stable voltage I attained with my beginner/intermediate OC ability. You are right in that it is borderline stable in that it wasn't until I tweaked with LLC to account for non-load Vdroop when I got my first 24/7 stability. This machine is used for heavy content creation as well as gaming, and no issues at these settings occurred until now.

I will look into tweaking the voltage a bit.

Thanks for the input.
post #10 of 11
Quote:
Originally Posted by Blameless View Post

It's possible that your previous OC wasn't really stable, but that you simply did not catch instability in your original testing. If you have changed or updated your settings, stress testing software, or any BIOS/firmware in the mean time, this could also be the cause.

It's not beyond reason that you could have damaged something, but you almost certainly did not damage the CPU.

^I'm thinking this as well. For me even after running +12H of prime95 and using the comp for lots of stuff including folding I is sill later came across a software that was more picky and had to bump up the voltage to keep things stable.
Edited by Bit_reaper - 3/24/13 at 4:23pm
    
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