Inexplicable BSODs happening at random times.

Hello tom's dwellers!
I've got some really unidentified problem: some BSODs come about from time to time, exactly in games ( at least in CS GO, CS 1.6, ETS2, all are steam ) or after gaming during surfing the Internet. The fact is that my monitor has 1440x900 resolution, hence I use some converter HDMI to VGA. I used to possess the following graphic cards recently: RX 480, GTX 980ti. Everything was fine.
Unfortunately, I have no spare monitor to test, but the converter worked fine with mentioned graphic cards before. So, anyway, one day, when I launched CS 1.6, in a few minutes of being at startup display, there appeared some lags of sound and artifacts which were followed by a reboot all of a sudden. Here is a screen:

Here are screenshots of BSODs from Bluescreenview:






Well, here is a list of what I have already checked:
* MEMTEST86, no issue. I was checking my RAM up for the whole night, pluging first one module, then another one.
* OCCT, I imply benchmark for both CPU and PSU. No issue was noticed.
* Furmark, 3dMark, Superposition Benchmark, Heaven Benchmark, no artifcats or something.
* Victoria, my HDD is supposed to be in a good condition, although it is not brand-new, it is still good one. No bad sectors;
Besides, I even launched both Furmark and OCCT simultaneously ( at the same time ), there wasn't any visible problem, all the more so any BSOD.
I even do not know what is happening to my system from time to time...

My specs:
CPU: i5-4590 (3700 mhz, 0.992v)
GPU: EVGA GeForce GTX 1070 GAMING, 08G-P4-6171-KR, 8GB (1911mhz)
PSU: Deepcool DQ750ST
RAM: DDR3-1600, Kingston Hyperx kit, 16gb (8*2)
HDD: WD BLUE 1 TB
MOTHERBOARD: B85-G43 MSI
MONITOR: asus vh197d

In addition to this, I know exactly that my 1070 had been mining before I bought it. I don't know, whether it is a fatal cause. If you need some more information, please let me know!
Thank you all in advance!