As the forum does not allow me to follow up on my 3 week old notice in the other thread (which apparently no one hat an answer to, anyway), I guess I will just my new question here where CFL modders should visit as well:
Long time, no call – and little improvement. 5 GHz Turbo works after setting all clock related options to auto/not optimized, but with all core synced it is of little use due to overheating. Even more OC adverse is the RAM which I does requier 1.25 V SA for -3000 after running 3200-3333 @ 1.2 V with the 6700K. However, this is small stuff and could only be investigated after solving:
Problem 1: Contiously self bricked system until powercycling. I did not observe this behaviour during the first couple of days at all and curiously neither during the last few, but in between it happened on 10% of all normal start-ups from soft-off, 20% on S4 resume, >50% on S3 resume (wake-up from suspend to ram), >>>50% after OC caused systeme crash and on every single reboot attempt after it occurs a first time. Behaviour: System stops at code 00, no attempts to initalize CPU yet alone drives. The system will not respond to reset button at all (first time I saw a reset signal being blocked in a quarter century of PC use; reset buttons works though in normal circumstances) and long press of power button will only shut the system down, with same problem being guaranteed on next power up. Only way out is to remove system from the power line for a minute or to reset UEFI.
Problem 2: This also arose later but continous to happen anytime from every other day to thrice in one afternoon. The screen will go black, followed by an instant reboot which pauses with an “CPU has been changed” warning. System will continue to boot, though, using the old UEFI settings. (As this fits normal behaviour upon pressing reset button, i completely removed that one from the system. But nope – thats not the problem.)
Has anyone observed similar behaviour on a Coffee Lake Z170 system? I have not observed any other instabilites at clocks I currently run. System behaves fine from idle desktop and low intensity surfing over heavy multitasking and light gaming to heavy gaming and full other Prime95 8k. 200% run memtest win (which represents hours upon hours of RAM testing on a 64 GiB machine with only 8 cores) did not find any errors, either.