8700K delid temps

Discussion in 'Processors and motherboards Intel' started by toyo, Dec 9, 2019.

  1. toyo

    toyo Master Guru

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    Hello guys,

    First things first: my main curiosity is - are the temps OK and within expectations? Or can it be improved?

    I took the jump and delidded my 8700K. It's quite a mediocre CPU compared to what I've seen on the web for people winning the silicon lottery. But my preoccupation is not that much with the OC itself, but with the temps and if I applied the stuff correctly. There are quite a few delid tests on the web, but few are actually properly documented, i.e. you don't know for sure what sort of exact test people use, if they disabled AVX, what settings did they use inside prime95, what exact voltage and which voltage method etc.

    I'll start with the settings and components, and then will link 2 screenshots. I tried to use a common test for p95/Coffee Lake OCs, 1344K Inplace FFTs with AVX disabled at 1.35V manual voltage inside the BIOS, so it's easy to replicate.

    Specs: 8700K delidded, Conductonaut on die and back of IHS, as thin a layer as I could. Clear nail varnish on the 4 contacts near the die. Light resealing with Reinzosil sealant for high temps (can't really recommend this, it kind of forms a very thin layer on the substrate that's very hard to clean, no scraping works, and isopropilic alcohol 99% or acetone won't dissolve it.). Kryonaut between IHS and cooler coldplate, small amount, tried to spread it as much as I could.

    Ambient temp: 24C.

    Cooling: Meshify C case, 4x140mm Noctua PWM fans (2 intake, 2 exhaust), 1x120mm exhaust at the back, Noctua D15S cooler with additional 120mm Noctua PWM fan on the front.

    In the tests the fans run at around 60-75% (approx 1500rpm for the 120mm, 1000 rpm for the 140mm).

    Motherboard is a shitty 4 phase VRM MSI Gaming Plus. I haven't seen it throttle yet with up to 165W package power on the CPU. It's basically the same VRM as on the MSI Z370-A Pro "reviewed" by der8auer in this video, where he could OC to 5.1GHz without a fan on the VRM. The VRM temps for my use case are 80C-ish, peaking at 92C. I personally don't feel comfortable drawing more than 150W through the VRMs.

    Because of the motherboard VRM and the insane rise in power drawn with AVX2 and Prime95, I can't really run SmallFFTs with AVX2 as a test. My CPU is not a great sample and it seems to require around 1.33V-1.34V for 4800MHz if I enable AVX2. 5GHz would likely require 1.4V to get "fully" stable.

    Now, the tests. 1.35V in BIOS. 50x multi, no AVX offset, 44x Uncore.

    Test 1: prime95, last version, AVX disabled, 1344K Inplace FFTs, 15 mins (seem to be enough for peak temps, in fact they seem to go down over the test).

    Max core 75C, average core/package temp 71C, power draw peak at 144W.

    [​IMG]

    Test 2: Realbench, last version (apparently this is an AVX test. It will also use the GPU, so this will contribute some to higher temps). 15 mins stresstest, 8GB RAM used.

    Max core temp 77C, average core/package 73C, peak power draw 134W.

    [​IMG]

    If you want me to try and replicate your own conditions, hopefully it's not too low of a voltage, my 8700K is unstable at below 1.32V@5GHz, so I can't really test that. Also I can't test with P95 AVX2 at higher than 4.8GHz or so because of the shitty VRMs and me needing quite high voltage to reach AVX2 stability.

    Sorry for the long post. Just trying to see if I did apply the Conductonaut properly basically. Already redid the delid once, but not much has changed, if anything.

    Bonus pics (with liquid metal seen affecting the IHS after just 2 days, and the very thin silicon pellicle that remains after the Reinzosil sealant and I can't remove). Cleaning the IHS is pretty much impossible too. Acetone, isopropilic alcohol couldn't undo the reaction. LM seems quite reactive even with the nickel plated IHS.

    [​IMG]
    [​IMG]
     
  2. Arctucas

    Arctucas Ancient Guru

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    Try using metal polish, such as Flitz or TurtleWax.
     
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  3. airbud7

    airbud7 Ancient Guru

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    that is good for air cooling...no?
     
  4. toyo

    toyo Master Guru

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    Might be. That's what I was trying to find out. I kinda tested more, with different amounts of sealing (or no sealing), and sadly with a different thermal paste between the IHS and the cooler coldplate. Kryonaut is a HUGE disappointment, I wish I would have googled more about it, the "best" thermal compound scratched both the IHS and the coldplate, not a tragedy, but looks like crap. Went back to Noctua NT-H1.

    Best results so far (2-5C below the pics) are with more sealing, liquid metal moderate/thin on both IHS and die, and NTH1 replacing Kryonaut. I feel like Thermal Grizzly should reimburse the coolers they scratched, it's stupid to pay such a premium and get lower perf. than cheaper paste and scratches. Guess I'll make a new thread with the scratching.

    But yeah, I think this is about as good as it gets, at least for my skill and the mats I used. I was hoping for people with the delidded 8700k to throw in some of their numbers so I can check against their temps.
     

  5. JjX

    JjX New Member

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    "TG-Support said:
    Hi :)
    Wanted to give you guys some official feedback from Thermal Grizzly side.

    We indeed had one bad batch of thermal paste early 2018 which we only noticed after it was already shipped out to customers.
    We always take samples from each batch and perform spot tests but it appeared that in this specific batch the spot tests which we performed had the normal performance,
    but several syringes had zinc oxide which was not perfectly grinded the way it should be. Zinc oxide is quite hard and strong compared to metals like copper used for coolers and CPU heatspreaders. This explains the scratches you saw on some pictures here.
    Due to the fact that the thermal paste has no S/N we unfortunately were not able to track where this shipment was sent/sold.

    We are very sorry that some of you experienced this and we will try our best to compensate your personal cases.
    In general if you experience any of the problems described in this thread don't hesitate to contact us directly: support@thermal-grizzly.com and we will figure something out for you.

    I can also tell you that we changed the supplier after this incident. The new chemical factory has top-notch roll mills which we personally inspect every quarter to make sure we can maintain perfect quality.

    Again we are very sorry about this but you can be sure that this won't happen again in future and if you have any additional questions or requests please shoot an email to us.
    Thanks and Bear-Wishes
    TG-Support "

    just try a new Tube!
     
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  6. toyo

    toyo Master Guru

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    I sent them an email. Still have the package with the serial number. I wonder what they will say. IMO it's quite the feat to scratch cooler and IHS and a true failure of the QC department. Just 3 days were enough for the ugly scratching (posted it in a separate topic). Luckily temps seem unaffected, in fact, I changed to Noctua NTH1 paste now and the temps seem better, so the Kryonaut might have been not just scratching, but also bad performing.

    EDIT:
    TG Support is very good and should be commended. The scratching issue is settled.
     
    Last edited: Dec 10, 2019
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