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Freeze on Prime95 Blend at stock speeds with 2.0x BIOS

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joshf87
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2018/08/26 02:45:24 (permalink)
CPU: Intel Core i7-6700K
Motherboard: EVGA Z170 Classified K (142-SS-E178-KR)
PSU: EVGA SuperNOVA 750 G2 Power Supply (220-G2-0750-XR)
Graphics: EVGA GeForce GTX 1060 GAMING ACX 3.0 (06G-P4-6262-KR)
Memory: G.SKILL TridentZ Series 16GB (F4-3200C14D-16GTZSK)
SSD: Samsung 850 EVO (250GB)
HDD: 2x Western Digital WD1003FZEX
OS: Windows 10 Professional 64-bit (1803)
 
 

With the dual-bios/uefi, the first BIOS/UEFI has 1.04.
The second BIOS/UEFI, currently has  2.03 (Pre Spectre/Meltdown fixes).
HWiNFO reports the same Intel MicroCode for both 1.04/2.03.
I currently have the switch set to the second one that has 2.03.

I have zero real-world issues on the 2.03 BIOS, until I ran Prime95 Blend (29.4) for a thermal test and seconds to a minute into the test it freezes requiring a hard reset with 2.03. The initial test is FMA3 (400K FFT) and will not finish even one iteration before freezing. From what I can find is that Skylake has an issue with AVX under extreme load in apps like Prime95 that a supposed MC update fixed, but that would purposely require someone to disable the FMA3 test in Prime95. The exact opposite of what I am experiencing, FMA3 is causing the issue. My RAM has an XMP profile (3200)  but even setting that at SPD (2133) did not affect anything for the better on 2.03.

It is not just Prime95, but LinX (Linpack) also freezes on 2.03, but not 1.04. Again, stock CPU and SPD RAM, and not reaching thermal limits on the CPU.

Ironically I only did minor overclocking ever despite have a K CPU (to 4.2GHz, the turbo speed basically) and haven't gotten around to any serious overclocking..

I'm only fishing for insight at this point ..
post edited by joshf87 - 2018/08/27 23:09:04

Desktop: Intel Core i7-6700K | EVGA Z170 Classified K (142-SS-E178-KR) | EVGA SuperNOVA 750 G2 Power Supply (220-G2-0750-XR) | EVGA GeForce GTX 1060 GAMING ACX 3.0 (06G-P4-6262-KR) | G.SKILL TridentZ Series 16GB (F4-3200C14D-16GTZSK) | Samsung EVO 850 EVO (250GB)
HTPC: Intel Core i5-8600 | EVGA Z370 FTW (134-KS-E377-KR) | EVGA SuperNOVA 750 G2 Power Supply (220-G2-0750-XR) | Ballistix Sport LT 16GB (PC4-21300) (BLS2K8G4D26BFSBK) | Samsung EVO 860 EVO (500GB)
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    Etny2k
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    Re: Freeze on Prime95 Blend at stock speeds with 2.0x BIOS 2018/09/02 02:59:55 (permalink)
    Hi, would like to chime in that after the 2.0X stuff early 2018 I started having freeze ups and the light to the bottom left corner of cpu would light up. My totall workaround to the inevitable freezing while in 1440p gaming is setting my 6700k to 4.2GHZ boost clock at all cores and then the vcore to adaptive at +1 or +0.1MV whatever is lowest. No crashes this way. This may not be your problem but it was my fix.

    EVGA Z170 Classified K Intel 6700k Corsair H100i GTX Zotac Amp! Extreme Core 1080 Ti G.SKILL Ripjaws 16-3466 EVGA 650W G3 SuperNOVA ACER Predator 1440-165 Gsync Cooler Master MasterCase Pro 5
     
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    joshf87
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    Re: Freeze on Prime95 Blend at stock speeds with 2.0x BIOS 2018/09/16 23:31:07 (permalink)
    No luck there.. I even tried raising VCCIO (due to the 3200MHz RAM) but it seems to be ignoring whatever I set it to, the voltage reading in UEFI setup when set to Auto says 1.2V for VCCIO. So I set to to 1.21 or 1.22, reboot, but even at "Auto" it will sometimes say as low as 0.200v. The same goes for VCCSA, didn't even mess with it and it'd say as low as 0.200v as well.  At least in HWMonitor the VID for VCore is something like 1.145v but VCore reads about 1.2v.
     
    I am getting a CLOCK_WATCHDOG_TIMEOUT stop error even at defaults (including not using RAM at XMP Profile).. any attempts to raise voltages result in WHEA_UNCORRECTABLE_ERROR.
     
    I'll test the RAM again I guess.
     
    I'm conflicted.. just ignore it and everything is actually fine, Prime95/Linpack are the only metrics at this point I am going by that something is wrong. Nothing else to date has produced STOP errors or freezes. Maybe Prime95/Linpack are triggering Skylake/MicroCode flaws that would occur  1 in a trillion in real-world applications, but I don't want to  take those chances either.
     
     
    post edited by joshf87 - 2018/09/17 00:47:09

    Desktop: Intel Core i7-6700K | EVGA Z170 Classified K (142-SS-E178-KR) | EVGA SuperNOVA 750 G2 Power Supply (220-G2-0750-XR) | EVGA GeForce GTX 1060 GAMING ACX 3.0 (06G-P4-6262-KR) | G.SKILL TridentZ Series 16GB (F4-3200C14D-16GTZSK) | Samsung EVO 850 EVO (250GB)
    HTPC: Intel Core i5-8600 | EVGA Z370 FTW (134-KS-E377-KR) | EVGA SuperNOVA 750 G2 Power Supply (220-G2-0750-XR) | Ballistix Sport LT 16GB (PC4-21300) (BLS2K8G4D26BFSBK) | Samsung EVO 860 EVO (500GB)
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    HeavyHemi
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    Re: Freeze on Prime95 Blend at stock speeds with 2.0x BIOS 2018/09/17 09:24:43 (permalink)
    joshf87
    CPU: Intel Core i7-6700K
    Motherboard: EVGA Z170 Classified K (142-SS-E178-KR)
    PSU: EVGA SuperNOVA 750 G2 Power Supply (220-G2-0750-XR)
    Graphics: EVGA GeForce GTX 1060 GAMING ACX 3.0 (06G-P4-6262-KR)
    Memory: G.SKILL TridentZ Series 16GB (F4-3200C14D-16GTZSK)
    SSD: Samsung 850 EVO (250GB)
    HDD: 2x Western Digital WD1003FZEX
    OS: Windows 10 Professional 64-bit (1803)
     
     

    With the dual-bios/uefi, the first BIOS/UEFI has 1.04.
    The second BIOS/UEFI, currently has  2.03 (Pre Spectre/Meltdown fixes).
    HWiNFO reports the same Intel MicroCode for both 1.04/2.03.
    I currently have the switch set to the second one that has 2.03.

    I have zero real-world issues on the 2.03 BIOS, until I ran Prime95 Blend (29.4) for a thermal test and seconds to a minute into the test it freezes requiring a hard reset with 2.03. The initial test is FMA3 (400K FFT) and will not finish even one iteration before freezing. From what I can find is that Skylake has an issue with AVX under extreme load in apps like Prime95 that a supposed MC update fixed, but that would purposely require someone to disable the FMA3 test in Prime95. The exact opposite of what I am experiencing, FMA3 is causing the issue. My RAM has an XMP profile (3200)  but even setting that at SPD (2133) did not affect anything for the better on 2.03.

    It is not just Prime95, but LinX (Linpack) also freezes on 2.03, but not 1.04. Again, stock CPU and SPD RAM, and not reaching thermal limits on the CPU.

    Ironically I only did minor overclocking ever despite have a K CPU (to 4.2GHz, the turbo speed basically) and haven't gotten around to any serious overclocking..

    I'm only fishing for insight at this point ..




    What were your temps? I know you said you were not hitting your 'thermal limit' (which BTW is ~100C) but, what were your temps?

    EVGA X99 FTWK / i7 6850K @ 4.5ghz / RTX 3080Ti FTW Ultra / 32GB Corsair LPX 3600mhz / Samsung 850Pro 256GB / Be Quiet BN516 Straight Power 12-1000w 80 Plus Platinum / Window 10 Pro
     
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    joshf87
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    Re: Freeze on Prime95 Blend at stock speeds with 2.0x BIOS 2018/09/17 11:07:38 (permalink)
    Only around 65c.

    Desktop: Intel Core i7-6700K | EVGA Z170 Classified K (142-SS-E178-KR) | EVGA SuperNOVA 750 G2 Power Supply (220-G2-0750-XR) | EVGA GeForce GTX 1060 GAMING ACX 3.0 (06G-P4-6262-KR) | G.SKILL TridentZ Series 16GB (F4-3200C14D-16GTZSK) | Samsung EVO 850 EVO (250GB)
    HTPC: Intel Core i5-8600 | EVGA Z370 FTW (134-KS-E377-KR) | EVGA SuperNOVA 750 G2 Power Supply (220-G2-0750-XR) | Ballistix Sport LT 16GB (PC4-21300) (BLS2K8G4D26BFSBK) | Samsung EVO 860 EVO (500GB)
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