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  1. #1
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    Can't reach 5Ghz, overly high 100C temp with AVX and Prime95

    I am having issues with OC'ing 8700K my ASUS Hero X WiFi (latest 1503 BIOS). It hits 4.8Ghz stable at 1.328v on all cores with ASUS Enhancement disabled, C/P-States disabled, SpeedStep disabled, Load Line Calibration setting 5, VCore set to manual 1.360v. My Cryorig Universal R1 Dual Tower keeps CPU under 80C with AVX disabled (offset set to 0), but if AVX is enabled, then Prime95 (latest) small FTE (or FFE or whatever) makes my temps sky-rocket to 100C in no-time at all and I checked to make sure the cooler is properly installed. From what I understand, on non-delidded 8700K, heavy Prime95 AVX test can make 8700K reach 100C even on water.

    The real issue is that i can't hit 5.0Ghz at all... Usually Windows 10 simply does not boot past 4.9Ghz, regardless of VCore... RAM is DDR4 Corsair Platinum Dominator 3200Mhz @ 3200Mhz 1T. Any ideas? Bad chip?

  2. #2
    ROG Guru: Brown Belt Array NemesisChild PC Specs
    NemesisChild PC Specs
    MotherboardASUS Maximus X Hero (WI-FI AC)
    ProcessorIntel i7 8700K
    Memory (part number)G.Skill F4-3600C16D-16GTZR
    Graphics Card #1Nvidia GTX 1070 Ti FE
    Graphics Card #2Nvidia GTX 1070 Ti FE
    MonitorASUS ROG Swift PG278Q
    Storage #1Samsung 970 PRO 512GB NVMe M.2
    Storage #2WD Black 2TB 7200 RPM 64MB Cache
    CPU CoolerNZXT Kraken X42
    CaseCooler Master HAF 932 Advanced
    Power SupplyEVGA SuperNova 1200 P2
    Keyboard Logitech G910 Orion Spark
    Mouse Logitech G703 Wireless
    Headset Logitech G Pro
    Mouse Pad SteelSeries
    OS Windows 10 Home x64 (UEFI)
    Network RouterLinksys WRT1900AC
    NemesisChild's Avatar
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    What is your highest ambient temp and how is the airflow in your case?

    What TIM are you using and how was it applied?
    Intel i7 8700K@ 5.2GHz (Delidded)
    ASUS Maximus X Hero (Bios 1801)
    NZXT Kraken X42
    G.Skill TridentZ@ 4000MHz CL16 2x8GB
    SLI: 2x Nvidia GTX 1070 Ti FE@ 2025/2025MHz
    OS: Samsung 970 PRO 512GB NVMe M.2
    Storage: Samsung 960 EVO 500GB NVMe M.2
    Storage: 2x Samsung 850 EVO 500GB
    Storage: WD Black 7200 RPM 64MB Cache 2TB
    EVGA SuperNova 1200 P2
    Cooler Master HAF 932 Advanced

  3. #3
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    Arctic Silver 5 and pea'ish size on top/center.

  4. #4
    ROG Guru: Yellow Belt Array Zammin PC Specs
    Zammin PC Specs
    MotherboardASUS ROG Maximus XI Formula
    ProcessorIntel 9900K (Conductonaut Applied)
    Memory (part number)G Skill 3200Mhz Trident Z RGB 32GB 3200Mhz CL16
    Graphics Card #1RTX 2080Ti FE
    MonitorAcer Predator XB271HU 165Hz
    Storage #1Samsung 970 EVO 2TB M.2 NVME SSD
    Storage #2Samsung 860 EVO 1TB SSD
    CPU CoolerEKWB Velocity RGB
    CaseLian Li PC-011 Dynamic
    Power SupplyCorsair RM1000i
    Keyboard Corsair K95 Platinum RGB
    Mouse Steel Series Rival 600
    Headset Astro A50 (Gen 2)
    Mouse Pad ASUS ROG Scabbard
    Headset/Speakers JBL LSR305 Mk II
    OS Windows 10 Pro 64bit
    Zammin's Avatar
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    I was not able to hit 5Ghz on my 8700k without delidding and applying liquid metal, even on custom watercooling. Prior to delidding I ran 4.8Ghz @1.275V (in BIOS, 1.232V under stress test load) adaptive voltage mode and LLC4. I'm now at 5Ghz @ 1.350V (in BIOS, 1.31-1.33V under load) adaptive voltage mode and LLC5.

    Your voltage seems very high for 4.8Ghz, have you tried following Raja's adaptive voltage overclocking tutorial here:http://edgeup.asus.com/2017/kaby-lak...163.1518169370

    You may also want to look at Der8auer's 8700k overclocking video on YouTube to see how to max all your power limits as well, otherwise you may see issues such as downclocking under load.

    Following that guide I was able to get 4.8Ghz at a lower LLC setting and load voltage than my first attempt at manual mode where I used LLC6.

    I think you will likely continue to have temperature problems when using voltages over 1.30V on the stock chip and air cooling.
    Last edited by Zammin; 07-11-2018 at 03:16 AM.

  5. #5
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    Yeah, I was actually able to run 4.8Ghz @ LLC 5 @ 1.25v without issues after 1602 BIOS came out. The issue is that @ 5Ghz, CPU doesn't even have to get hot to fail to launch Chrome (which uses AVX), even @ 1.36v. That is why I don't think de-lid will help... Then again, I keep AVX Offset at 0 and maybe such expectations are overly high.

  6. #6
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    I was able do go for 5GHz on 8086K with water cooling, but temperatures were too high, between 85 and 97 C degrees under 100% load.

    At 4,8Ghz it had between 78 and 86 C degrees, what is still too high. On stock it has 45-55 C degrees...

    I think without delidding my piece will run just "on stock", I do not want to delid this one.

  7. #7
    ROG Guru: Yellow Belt Array Zammin PC Specs
    Zammin PC Specs
    MotherboardASUS ROG Maximus XI Formula
    ProcessorIntel 9900K (Conductonaut Applied)
    Memory (part number)G Skill 3200Mhz Trident Z RGB 32GB 3200Mhz CL16
    Graphics Card #1RTX 2080Ti FE
    MonitorAcer Predator XB271HU 165Hz
    Storage #1Samsung 970 EVO 2TB M.2 NVME SSD
    Storage #2Samsung 860 EVO 1TB SSD
    CPU CoolerEKWB Velocity RGB
    CaseLian Li PC-011 Dynamic
    Power SupplyCorsair RM1000i
    Keyboard Corsair K95 Platinum RGB
    Mouse Steel Series Rival 600
    Headset Astro A50 (Gen 2)
    Mouse Pad ASUS ROG Scabbard
    Headset/Speakers JBL LSR305 Mk II
    OS Windows 10 Pro 64bit
    Zammin's Avatar
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    Quote Originally Posted by MonarchX View Post
    Yeah, I was actually able to run 4.8Ghz @ LLC 5 @ 1.25v without issues after 1602 BIOS came out. The issue is that @ 5Ghz, CPU doesn't even have to get hot to fail to launch Chrome (which uses AVX), even @ 1.36v. That is why I don't think de-lid will help... Then again, I keep AVX Offset at 0 and maybe such expectations are overly high.
    Yeah i understand. That's why i mentioned Der8auer's video guide as I suspect you may be hitting power draw limits or something. There's a few power limits that you normally need to max out when going for those higher clocks. Just an idea.

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