But does corsair Link may cause a system freeze with black screen even pc power switch long press not doing anything? And yes I have updated my corsair link to latest version.
Ok my long story short and my final findings are as follows,
1. On day one after I installed all my components I have ensured the cpu is sitting properly before closing the latch. Power on my system of old Windwos 10 ssd and before going to windows I setup bios with with latest Asus 0805 AGESA 1.0.0.6a. That time everything was in pure default and my ram profile was auto at 2400MHz 1.20v.
2. Then clean installed Anniversary edition of Win10 and installed all latest drivers available and windows update (not founders) it is the basic cumulative updates.
3. Started to experiance RAM issue with mobo amber light blinking sometimes as well as VGA error led sometimes the the display turns off.
4. Then I started to play with RAM speed (not timining: it is set by the mobo) and found the situation is much stable if I turn of the default D.O.C.P profile which by default switches on 3200Mhz profile (14 timining as written on the stick 1.35v).
5. Again experianced the problem. Sometimes VGA light is on or the RAM light is on.
6. After few days no error led but display of, PC freeze even power button is not working
7. I downloaded Windows 1703 founders clean iso and installed it fresh. The pc was working fantastic that time for upto 7hrs. Completed all installation and update with asus AISuite III till this time.
8. On next day morning after I woke up and started my pc and the display gone in less than 5 mins. Restarted by switching off UPS. Restarted again same problem and it continued.
9. I have checked it with different bios setting like> default, SMT on/off, LLC Auto/Regular/medium, SoC LLC Auto/Regular, Slight overclocking without changing voltage, Turned CPB off, even tried under-volting my CPU upto -0.03125 offset.
I observed one strange behavior of this system: In default when CPB is on this mobo pushes crazy voltage spikes like 1.52v as shown in the left corner of bios but immediately switches back to 1.21v.
One more thing, If I increase the core ratio say 38 then the voltage automatically increases no matter what I selected in bios. e.g. 38 ratio and core voltage is 1.375(bios) - 0.03125 (offset) but during the stress test HW info and all other programme showing the voltage reaching upto 1.40v on core (LLC of Core and SoC both was regular). But the problem of display is there for every single experiment and it is random.
10. Again clean installed Windows 10 1703 and this time no AISuite, fan controlled by bios, chipset driver of AMD not asus, tested with two different GPU i.e. GTX970 and R9-290 (cleaned driver as well). Nothing fruitful.
11. Also tested the memory with memtest for total of 14 Hours and found Zero issues. Also tested with few of my different PSU cables just to ensure it.
Summary:
This problem is absolute random. Sometimes it takes 5 mins and sometimes 7 hr. But it is there. Nothing to do with overclock, it remains exactly same. Situation improves with 3200Mhz ram clock + R9-290 compared to Auto RAM frequency + GTX970. Found one issue in Prime 95, one worker stopped and returned fatal error, but as per G.Skill tech support it may occur rarely and not a ram problem. Most of the time when it occurs, on the mobo any diagnostic light not glows. When I ac power off the system of course there will be some power in the mobo, now unless it is drained completely, if I switch on the ac power the power button fails to turn on the PC. PC only turns on after the power is drained. But in bios it never ever shows any error or failure or press F1 to config BIOS. But it happens (error and bios set up needed) when the RAM failure occurs with amber mobo led on/blinking but that time, power button works perfectly to switch off the PC (force shut down).
So the problem is too complicated for me.