PC random shutdown and reboot all of a sudden with *no bosd while doing nothing (idle) or while browsing or watching YouTube on chrome. While gaming it does not have any issues, infect I can game 4 hours+ without any issues. It all happend few days after my yearly system clean and overclock tweeking, mainly increase core frequency from 4.5Ghz to 4.7Ghz and fine tune vcore by lowing offset voltage. But currently on stock settings but still sudden reboot.
Sometimes it only happend once in a day but other time it can restart up to 5 times (like today it restated 7 times since afternoon). The restart can happend anywhere between hours to minutes after the last sudden reboot.
Unable to provide system dump because there's no BOSD it's like someone turn off and on the main and quickly press the power button after that.
By far the troubleshoot I have done
Reinstall the driver that looks like it was the cause (Asus ai suite 2) - no luck
Recheck cable connection - no luck
Reseat CPU - no luck
Change cmos battery - no luck
*Change oc to defult - no luck
*Check event viewer - no luck
Memtest86 (3/4 pass (didn't run all) ) - no luck (all pass)
Stress test (real bench, AIDA, prime95 (max stress), furmark, haven) - no luck
Monitoring voltage in windows (hwinfo, AIDA hwm+, open hwm, asus suite) - no luck all looks fine (even on stress test)
Monitoring voltage by molex using multimeter - no luck looks fine (even on stress test)
*Monitoring voltage through motherboard - no luck all looks fine
Monitoring voltage through ROG connect - no luck all looks fine
Check temps - all looks fine CPU @ max load 70°C at stock (@4.7ghz @76-80°C?), GPU @ 72°C
*Did a clear cmos and reapply my settings all the same. So I reset multiplier to auto and offset voltage (+) to AUTO (Basicly defult). But still the same reboot without any warning.
*Event viewer only show 3 errors
Error 1 audit events have been dropped by the transport. 0
Error 2 critical reboot, system has rebooted without shutting down first l
Error 3 the system has previously shutdown
*Motherboard voltage measurement through Asus ProbeIt measurement points
System spec
Motherboard: Asus Maximus IV Extreme Z
Ya it's an old board but it's still gets the job done
Latest BIOS
Change this few setting
Vcore load like calibration - 50%
Vcore phase control - Optimized
Vcore overload protection - 130%
Voltage - offset (Defult - Manual)
Dram settings (see ram)
Second hand from my uncle and have been using since 2016 without any problem
CPU: 2600k (Noctua NH U12P dual fan)
4.7Ghz @ 1.448v (max voltage on stress test)
4.5Ghz @ 1.4v
Stock 3.8Ghz @ ~1.36v (current) (voltage auto) (CURRENT)
Previously it was fine running at 4.7Ghz with an offset of +0.75 but I lower it till +0.55 and no crash.
CPU has been properly taken care of with no issues of high temp or throttling but it looks like there is CPU degration from age
RAM: 2 4GB DDR3 1333Mhz (Kingston), 2 4GB DDR3 1600Mhz (Crucial)
1333Mhz have been running since 2016/2017
1600Mhz added in Aug 2019
RAM frequency has been lock in bios @1333mhz, timings auto, voltage 1.5v
All 4 sticks of RAM has no issues
GPU: Asus strix GTX 1060 6gb
GPU is overclock but I don't think that's the issue as it reboots when not on load
PSU: Silverstone Strider 600W fully modular PSU (ST60F-P)
Been using this PSU since 2014 and 2 system changes
So far only 2 PCIe cable that was previously causing black screen (GPU crash) due to caps I think, but has been replaced with a spare cable and no problem ever since.
Sound card: Asus Xonar DGX
SSD: Crucial MX500 500GB
HDD: WD Blue 1TB
Windows: Windows 10 latest update (Last format was in December 2019)
Note: My PC is connected to belkin power surge strip since 2015? and has been using it almost everyday from almost morning till late at night or afternoon till late at night and no RGB.
Thinking of trying a spare PSU and see how it goes. Will update if problem still proceed.
Hope you get an idea of what is happening and hope this fan be solve without spending much money.