BSOD in random times

IMPORTANT UPDATE :
i tried to re install windows too and unpluged 1 hdd and now i got different error (i think)

nothing changed. I tried to unplug and plug all cables again. Checked for drivers (all was latest) and bios was latest also.
I also tried to get new cables for HDD and cause my power supply is modular i tried to put different power cables too.
tested memory with memtest and it passed all tests

new update.
after re install windows i get often "your display driver crashed and it was successefully recovered.

should i try this (driver is latest)

Fix: Display Driver Stopped Responding and Has Successfully Recovered

Anarin said:

new update.
after re install windows i get often "your display driver crashed and it was successefully recovered.

should i try this (driver is latest)

Fix: Display Driver Stopped Responding and Has Successfully Recovered

I worked on a PC once that had that happening all the time at random intervals.
Eventually it was a bad stick of ram even though (!) it passed memtest several times.