Suddenly not booting with all cores enabled

My setup was working flawlessly for a week and one day few minutes after boot Windows suddenly froze for no obvious reason and after hard reset no system boots with more then 3 cores enabled, and even with 3 sometimes doesn't boot. CPU temperatures are never higher than 30-40°C. I checked everything inside case, everything seems correctly installed. Intel Processor Diagnostic Tool passes with no errors (also with 3 cores enabled). I tried memory in different slot, didn't help. Nothing is and never was overclocked (as far as I know, I use default UEFI settings), voltages are on standard levels. I have latest UEFI.

I'm using following components:

Intel i5-6600K

ASRock Z170 EXTREME4

HyperX DDR4 8GB 2133MHz Cl14 Fury Black [HX421C14FB/8] (single stick)

Zalman ZM600-GSII 600W

CoolerMaster Hyper TX3 EVO

I use integrated HD 530 GPU.

If it is of any help, I have dualboot with Windows 10 and Opensuse Tumbleweed. POST is fine, GRUB works fine, with all cores enabled Windows hangs at blue logo (with no circling dots) and GNU/Linux after which looks like NMI watchdog initialisation, the last line trace looks like "[0.559] #0 #1 #2[", which I imagine could probably indicate, that something is wrong with core #4, or when system tries to initialise / use last core.

I did IPDT for UEFI, since I cannot boot into any system with all 4 cores enabled. The only thing out of order seems to be this, it's same with 3 and 4 cores enabled:

--- Reading CPU Frequency ---

Expected CPU Frequency is --> 3.50GHz

Detecting CPU Frequency ...

Detected CPU Frequency --> 4.6665

CPU Frequency Test Passed with Warning!!!

The processor frequency could be affected by power management features. In

order to ensure the processor frequency is not affected by a power management

setting, enter BIOS, load defaults, and disable any 'Over-Clocking' or power

management features that may affect processor frequency. Also, set any

software applications which control power management features to default.

When I run test on Windows with 3 cores enabled, detected CPU frequency is 3.4996 GHz and clock frequency is 99.9912 MHz.

Edited by wildfireheart - 09 Jan 2017 at 6:59pm

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wardog Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 15 Jul 2015 Status: Offline Points: 6447	Post Options Post Reply Quote wardog Report Post Thanks(0) Quote Reply Posted: 09 Jan 2017 at 7:37pm
	233x20 will get 4.665Ghz What was the normal OC she ran on?

wildfireheart Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 09 Jan 2017 Status: Offline Points: 8	Post Options Post Reply Quote wildfireheart Report Post Thanks(0) Quote Reply Posted: 09 Jan 2017 at 6:52pm
	My setup was working flawlessly for a week and one day few minutes after boot Windows suddenly froze for no obvious reason and after hard reset no system boots with more then 3 cores enabled, and even with 3 sometimes doesn't boot. CPU temperatures are never higher than 30-40°C. I checked everything inside case, everything seems correctly installed. Intel Processor Diagnostic Tool passes with no errors (also with 3 cores enabled). I tried memory in different slot, didn't help. Nothing is and never was overclocked (as far as I know, I use default UEFI settings), voltages are on standard levels. I have latest UEFI. I'm using following components: Intel i5-6600K ASRock Z170 EXTREME4 HyperX DDR4 8GB 2133MHz Cl14 Fury Black [HX421C14FB/8] (single stick) Zalman ZM600-GSII 600W CoolerMaster Hyper TX3 EVO I use integrated HD 530 GPU. If it is of any help, I have dualboot with Windows 10 and Opensuse Tumbleweed. POST is fine, GRUB works fine, with all cores enabled Windows hangs at blue logo (with no circling dots) and GNU/Linux after which looks like NMI watchdog initialisation, the last line trace looks like "[0.559] #0 #1 #2[", which I imagine could probably indicate, that something is wrong with core #4, or when system tries to initialise / use last core. I did IPDT for UEFI, since I cannot boot into any system with all 4 cores enabled. The only thing out of order seems to be this, it's same with 3 and 4 cores enabled: --- Reading CPU Frequency --- Expected CPU Frequency is --> 3.50GHz Detecting CPU Frequency ... Detected CPU Frequency --> 4.6665 CPU Frequency Test Passed with Warning!!! The processor frequency could be affected by power management features. In order to ensure the processor frequency is not affected by a power management setting, enter BIOS, load defaults, and disable any 'Over-Clocking' or power management features that may affect processor frequency. Also, set any software applications which control power management features to default. When I run test on Windows with 3 cores enabled, detected CPU frequency is 3.4996 GHz and clock frequency is 99.9912 MHz. Edited by wildfireheart - 09 Jan 2017 at 6:59pm