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  1. #1
    ROG Junior Member Array
    Join Date
    Sep 2014

    Problems with idle Vcore on 8700k after OC

    so , i managed to oc my 8700k to 5ghz after delid and lm ,

    XMP: on

    MCE: Off

    AVX offset: 0

    Sync all Cores : 50

    SVID support : Auto

    LLC: 1 ( thought it was at 6 but for some reason its at 1 now lol .. ) , tried llc6 but then it jumps to 1.5+ at idle sometimes ..

    Power limits maxed

    BCLK aware : Off

    Speedstep: off

    Voltage mode : Adaptive 1.35v and offset -0.07

    it ran 2 hours of asus realbench fine and the reporte Vcore by hwinfo was 1.344v

    my issue is , that in idle the vcore shoots up to 1.41+ v sometimes for no reason ( atleast no reason for me )

    with 1.35v manual mode the pc wont even boot into windows

    how can i get rid of the stupid high idle vcore i sometimes get ? , am i doing something wrong ?

    is this caused by the LLC ?

    its an 8700k

    asus strix z370-f on latest bios

    32gb ddr4 cl15 2400mhz ram

    2x360mm radiator watercooling

    max temp under load was 75c

  2. #2
    ROG Guru: Yellow Belt Array Carlyle2020 PC Specs
    Carlyle2020 PC Specs
    MotherboardAsus Maximus XI APEX
    Processorgaming9900ks@5.2/avx 0/ adaptive vcore / 1.35+0.020 offs/LLC5/ac ll 0.01/TVB off/power saving on
    Memory (part number)Gskill 4400 CL16 /65k r /65k w / 60k c
    Graphics Card #13080 ftw ultra /pads on backplate
    Sound CardXonar STXII mods:3xLME 49720NA
    MonitorLG 38GL950G / -HDR / +madVR
    Storage #12TB 970evo plus nvme
    Storage #21TB 960evo nvme +2x 1tb evo 860 hw-sata-raid
    CPU Coolerarctic freezer II 280
    CaseUnique Silverstone FT2 dampened up the wazoo V2.0
    Power SupplySeasonic TX-850
    Keyboard Cherry KC 1000 on top of a cherry MX1 for ergonomics :)
    Mouse MX Master 3
    Headset Sennheiser PC360 + Philips X2HR
    Headset/Speakers A250 / cause LG was stingy
    OS Win 10 64bit
    Network Routeryeah right...
    Accessory #1 Silverstone EBA01 headphone stand / black
    Accessory #2 radio Keyfob to turn on and off
    Accessory #3 4 bay fantec /10tb red/+scrap

    Join Date
    Mar 2018

    8700k & 8086k owner here.

    For an accurate interpretation kindly use the search function.
    There are many threads about this issue with a gigaton of knowledge.

    The simplified version:
    vcore feeds more than one demand. cpu/uncore/..and avx if i recall correctly
    The last one has shown itself to you by ramping up in windows due some background tasks using it for a very short period.
    Still long enough to be measured and witnessed by you as it seems. - nothing to tweak or "correct" here.

    short fix:
    Set avx -2 and be done with the whole issue for good.

    The different needs concerning vcore align better under the same vcore value now
    ! Mostly only worth on the extreme top end of the OC scale mind you - so 5.0Ghz+

    So what am i saying
    The slowest vcore you can run your tests with is only that high because of the avx requirement on that chosen multiplier
    The cpu for sure can pass stress tests without avx loads with far less vcore.
    Uncore is even worse. And since you stress test like it is "mission critical" is suggest -5 on the uncore for the given cpu frequency.
    Gamer surely get away with -3/-2

    My own 8700k had the same stepping as the 8086k and ran 5.1Ghz with -1 avx as a gaming rig.
    The noctua D-15 did not ramp up quiet that often after using 5.1 with avx -2

    The next part is for 16Gb so kindly deinstall some ram and tweak system agent and vccio afterwards until stable with 32Gb.

    These settings are a neat starter pack for someone who wants to use adaptive and mitigaten its issues represented by spikes in that generation if avx -0 is involved.

    Most users give up and use manual vcore all day long to circumvent the adaptive issues of "spiking".
    Something like...5.0 @ manual vcore set at 1.27 with avx -2

    Here are my adaptive suggestions without any special order.

    svid support on
    Best Case scenario

    Only LLC 4-6. I am runnning LL5 in all my 370/390 rigs without thinking twice anymore.8700/9900ks-air/watercooled
    vccio 1.25
    vccsa 1.20
    pll term volt 1.1
    stand by 1.050
    IA AC Load Line 0.01 - spikey spikey smally smally
    TVB disabled. ... Although it seems to run and work on my 8086k by really limitting its use above 4.4
    PLL Bandwith (drop down menu usually) - yeah use 0 or maybe 1 for record benches
    cpu min cache 8
    cpu max cache 48 for now ( 49 and 50 only if you are lucky)
    synced multiplier of 50
    avx -0

    For 5.0 and -2 avx : 1.26-1.29 vcore
    For 5.0 and 0 avx : 1.32 vcore
    For 5.1 and -1 avx : 1.32 +0.030 ish offset
    For 5.2 and -2 avx : 1.35 +0.030 ish offset

    What i would do on water?
    5.2 with avx -1 for a gaming rig all day long with any vcore set to below 1.4.

    Personally i am using adaptive because electricity is expensive where i live. 50 vs 85 watt in idle.

    If I would delid a cpu my mindset would give a damn about the power bill and i surely would choose manual vcore.

    IFf your board bios has AI overclocking features set it to 165 with optimism 100. If the Rig runs almost stable, leave the settings and try 155 -185

    .. hehe and what the frag are those for ram sticks btw?
    Last edited by Carlyle2020; 11-25-2020 at 12:03 AM.

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