I had the same problem last 3 months. I did all the possible solutions, RAM cleaning, CPU reseating, bios update, default voltage, etc but no avail. Then, one day, I unplugged my 4+4 pin cpu connector, there I saw burn mark on one of the 4 pin and on the mobo.
Bought a new PSU and got my mobo repaired, cause I don't want to leave this x79 system. Now, everything runs perfectly just like new, no more crash or anything. Your problem may be different than mine but it's worth mentioning.