PC Trouble Shooting

Kinda long shot, but try to compare power values on different voltages on PSU

My pc was restarting because i had older psu with different power division, despite its overall W power was more than enough.

And forced restarts could damage MB i guess.

most likely:
simply a crap mobo (see ratings amazon & co) https://www.newegg.com/Product/Product.aspx?Item=N82E16813157634
^ ... not the right mobo, DDR3 you said - can't even find it for user reviews, but Skylake + DDR3 seems(ed) to have issues

unlikely:
PSU overkill (with that much headroom it doesn't run as efficient as well): https://outervision.com/b/L7Rtso

good luck figuring this one out:
DDR3 on Skylake: http://wccftech.com/skylake-does-not-support-ddr3-damage-ddr3l-only/

is there some sort of coincidence that the only time i've ever heard of a bios failure is when the motherboard has dual bios? never heard of a single bios based motherboard's bios ever die.
it's like they planned it. :/

I can't help you, but I know this situation can suck. So, have a bump so that someone who can help you might see this :)

Sure this looks like a PSU with irregular voltages or the motherboard is faulty because of capacitors gone bad and need a replacement.

Also check if your RAM modules are ok, just make a memory test to make sure (it takes long) faulty RAM modules can trigger random behaviours.

I suppose it would vary by motherboard, but if your system was actually overheating it should shut itself off and stay off. If the PC restarts you are getting a blue screen but your system is set to automatically restart on system failure so you never see it. If you know how, you can analyze the dumps to find out exactly what is causing the problem. If you don't know how to deal with the dump files I wouldn't recommend you try and learn, it is rather complicated; instead, try and find a support forum where they can do it for you.

Don´t trust the temps it gives you. I´ve had a similar "reset on performance spike" problem many years ago playing Operation Flashpoint Cold War Crisis and only with that game, everything else ran fine (like Crysis or Far Cry, don´t remember). Temps never showed anything suspicious.

To make a long story short, the CPU´s thermal grease had somehow vanished from the processor die.
Reapplied grease, problem solved.

As TLDRGLUE said, you are getting a blue screen each time but you can't see it because your system is set to automatically restart on system failure. You can use this utility to troubleshoot blue screens: http://www.nirsoft.net/utils/blue_screen_view.html

BlueScreenView scans all your minidump files created during 'blue screen of death' crashes, and displays the information about all crashes in one table. For each crash, BlueScreenView displays the minidump filename, the date/time of the crash, the basic crash information displayed in the blue screen (Bug Check Code and 4 parameters), and the details of the driver or module that possibly caused the crash (filename, product name, file description, and file version).

Also I suppose you have your motherboard bios updated to the latest version, don't you?

You can try the suspect games with one stick of RAM at a time. Also, don't you reset your BIOS options again? Is the battery new? Check the voltage of it.
Edit: Even if Memtest ran through.

try to update your bios http://www.asrock.com/mb/Intel/Fatal1ty%20H170%20PerformanceD3/index.nl.asp?cat=Download&os=BIOS

sounds like a power supply issue and seeing you have an off brand psu im going to go on a limb and say its your power supply. maybe borrow one from another system to test it out?