Warning: Some i7-6820HKs and i7-6700HQ have Uneven Core Temps due to Uneven Heatsink

Discussion in 'Hardware Components and Aftermarket Upgrades' started by iunlock, Oct 25, 2016.

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Does your 6820HK have cores that are 5c or higher than the others?

  1. Yes, I have a 6820HK that has 1 or more cores with a high temperature differential, greater than 5c.

    17 vote(s)
    10.2%
  2. Yes, I have a 6820HK that has 1 or more cores with a high temperature differential, greater than 10c

    24 vote(s)
    14.4%
  3. Yes, I have a 6820HK that has 1 or more cores with a high temperature differential, greater than 15c

    10 vote(s)
    6.0%
  4. Yes, I have a 6820HK that has 1 or more cores with a high temperature differential, greater than 20c

    24 vote(s)
    14.4%
  5. My 6820HK core temperatures are all tracking the same, with less than 5c difference.

    20 vote(s)
    12.0%
  6. Yes, I have a 6820HK where Core #3 (4th Core) is 10C cooler than the rest.

    1 vote(s)
    0.6%
  7. Yes, I have a 6700HQ that has 1 or more cores with a high temp differential, greater than 5c.

    17 vote(s)
    10.2%
  8. Yes, I have a 6700HQ that has 1 or more cores with a high temp differential, greater than 10c.

    16 vote(s)
    9.6%
  9. Yes, I have a 6700HQ that has 1 or more cores with a high temp differential, greater than 15c.

    10 vote(s)
    6.0%
  10. Yes, I have a 6700HQ that has 1 or more cores with a high temp differential, greater than 20c.

    11 vote(s)
    6.6%
  11. My 6700HQ core temperatures are all tracking the same, with less than 5c difference.

    15 vote(s)
    9.0%
  12. Yes, I have a 6700HQ where Core #3 (4th Core) is 10C cooler than the rest.

    3 vote(s)
    1.8%
  1. Kevin@GenTechPC

    Kevin@GenTechPC Company Representative

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    Internal failure as in defective hardware? And RMA is needed?
     
  2. hmscott

    hmscott Notebook Nobel Laureate

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    Yes, exactly.

    I've had it happen with a couple of LGA CPU's - 980x and 2700K, and have seen it happen to a couple of BGA CPU's where the owner needed to swap for another one with the retailer to solve the problem.

    XoticPC had one 6820HK hot core happen with mason2smart's new GT80S, and after several re-pastings XoticPC opened another GT80S - tested that the 6820HK was good - no high temperature core differentials - and shipped that to him.

    We have noticed several new owners besides mason2smart, with an Alienware 15 and an MSI GT62 with 6820HK's that had 10c-15c-20c hot cores, which will need returning or RMA.

    That's why we made the thread, so new 6820HK owners would know to look for this "hot core" problem. There seems to be more than the average number of 6820HK's with this problem.

    Also, with the 6820HK being removed as an option in new builds, it made us wonder if this might be a batch problem with the 6820HK, limiting the number available for new builds.
     
    Last edited: Oct 25, 2016
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  3. Prostar Computer

    Prostar Computer Company Representative

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    Is this specific to this machine? I don't recall running into this same idiosyncrasy in the Clevo arena, not on the few machines that tout a 6820HK anyway.
     
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  4. hmscott

    hmscott Notebook Nobel Laureate

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    It's unique to the particular sample of the 6820HK CPU, not an overall problem with a particular brand or model. :)

    We have recently seen 3 6820HK's with hot cores, an MSI GT80S 980m SLI, an Alienware 15 2016 (pascal), and a MSI GT62VR 1070.

    It could happen to any make / model with a 6820HK.

    We are only suggesting that new owners check by doing a load test, with even load on all 4 cores, say at 36x multiplier on all 4 cores, and check what the temperature differential is between the cores.

    Typically all CPU's will exhibit 0c-5c differential between 1 or 2 cores vs the others, the problems start when you have 5c or more difference.

    Those "hot" cores lead the way toward thermal throttling. Reaching thermal throttling quicker than the other cores, and therefore limiting performance to the weakest / hottest core.

    This problem with the "hot" cores in 6820HK can also happen to other brands, makes, models, it's a problem with the CPU if it has it, otherwise it's nothing to do with the maker.

    Hopefully not too many of these will be found, so far 3 have shown up, 1 in a new Pascal Alienware 15, 1 in an MSI GT80S, and 1 in a new Pascal MSI GT62.

    Check your core temps using a benchmark that evenly loads all 4 cores, set the core multipliers to the same setting, say 36x and see how much differential temperature is between cores.

    0c-5c is normal, anything higher will interfere with OC'ing and even normal operation, with the "hot" cores thermal throttling before the other cores. 8c-20c differentials have been seen.

    We also have a thread for this in the MSI section of the forums:
    http://forum.notebookreview.com/threads/i7-6820hk-troubleshooting-high-temps-uneven-cores.797483/
     
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  5. SoldierRBT

    SoldierRBT Notebook Geek

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    I tested my 6820HK at 4.0GHz running AIDA64 for 1 hour. These are the results.
    Is mi CPU OK?
     

    Attached Files:

  6. hmscott

    hmscott Notebook Nobel Laureate

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    I can't see the 1st image, but the 2nd image looks fine, just a couple of degree's C's off each other :)

    1st image looks good too, only a degree or two apart.

    Also, you don't need to run these tests for an hour. Start the test, reset hwinfo64 (what I suggest using) to start with fresh readings, and run for 5 minutes or so, just long enough to get a stable reading.

    You are looking for core temps that are within 5c of each other, like 65c, 63c, 62c, 64c is a good spread.

    If you have something like 65c, 75c, 64c, 76c, 65c - that's 10c+ off and those hotter cores will thermal throttle first, causing you to not be able to use all of your CPU performance.

    Your's look good. :)
     
    Last edited: Oct 25, 2016
  7. VICKYGAMEBOY

    VICKYGAMEBOY Notebook Deity

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    2222.jpg 111.jpg
    and this is my current cpu / gpu condition after repaste not sure what caused the issue, first the cable burn, now the center is like so messed up.. one after another I keep getting issues.. yesterday I had GPU throttling for first time, 920mhz for 1min, then gets back to 1126mhz, this happened after the latest Nvidia drivers, flashed to prema Vbios and older drivers with fresh install of OS, problem gone.. seems like something corrupted the VBIOS..
     
    Last edited: Oct 27, 2016
  8. quickie

    quickie Notebook Evangelist

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    alienware is starting to build me a new aw 15, i wonder will they get rid of my old 6820 an replace it with a 6700. if so i want that 120hz screen.
     
  9. Pallab

    Pallab Notebook Consultant

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    Are you using the stock paste or have you repasted?
    Is it the 17R4 or the 15R3 ?
     
  10. Mobius 1

    Mobius 1 Notebook Nobel Laureate

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    I can't see either of them
     
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