Weird overnight (only) boot failures

[lambrosgg]

Every day for the past 5 days I wake up and start my computer, but it fails to boot. Its very similar behavior with bad overclock settings, it shows the boot fail screen and prompts to load defaults or enter the bios.

This happens only when my computer stays off overnight, I tried shutting it down and turning it on again after a few minutes many times and it always boots that way.

I haven't changed any of my BIOS/OC settings, I am loading the same profile I created about a year ago and it has been 100% stable all this time.

The computer doesn't lose power overnight, its connected to a UPS and there are no power outages. Its a failed boot anyway, not a clear CMOS thing, so I doubt it has anything to do with power.

If I open the bios from the "failed boot" screen and load the profile I always use, it boots 1st try and all settings are applied correctly, I checked in BIOS and in HWinfo.

 

Some details on the specs and OC settings:
Gigabyte Z390 master with the latest bios (F11l)

9900k 5ghz all core, @ 1.37 volts

64GB (4*16) gskill RAM 3600mhz CAS 17 - overclocked to 3700mhz + CAS 16 @ 1.45v

 

Its very weird issue and its hard to troubleshoot because I need to wait one whole night to even try anything! I just wonder if anyone had something similar and found solution.

Thanks in advance!

[Analog]

My first suggestion would be to back off the memory overclock and run a couple of days without it. You issue to boot from a cold start might be because of memory training failure. 

[lambrosgg]

35 minutes ago, Analog said:

My first suggestion would be to back off the memory overclock and run a couple of days without it. You issue to boot from a cold start might be because of memory training failure. 

Wouldn't surprise me, since this board is very sketchy with memory overclock in general, I can't even boot from defaults just enabling XMP if I don't disable the onboard graphics card first (for some reason)

There is a setting for training RAM voltage, I wonder if it should be same/higher/lower than the actual ram voltage. Do you have any idea?

[Analog]

29 minutes ago, lambrosgg said:

Wouldn't surprise me, since this board is very sketchy with memory overclock in general, I can't even boot from defaults just enabling XMP if I don't disable the onboard graphics card first (for some reason)

There is a setting for training RAM voltage, I wonder if it should be same/higher/lower than the actual ram voltage. Do you have any idea?

 

I can't really say. Some memory likes voltage, others don't. With 1.45V you are pretty much at the limit of what is recommended for DDR4 and daily usage. I personally wouldn't go with anything more than 1.5V. The other thing is that you are running high density memory across all dimm slots, which is quite taxing on the memory controller. You can try loosening up the timings, perhaps, leave it running at 3700MHz but do something like 17-17-17-35 and lower the voltage to 1.4V. Still, considering that you are running four memory sticks, I would also recommend bumping the SOC voltage (or whatever the Intel equivalent is).