it reatarts every like 5 minutes but in some cases it doesn't even come to the bios stage of the boot up and it restarts
-another strange point is that the pc can run for days without restarts after cleaning and switch ram slots or removing the ssd
-i got a psu tester and it showed that the psu is on normal voltages so i guess the psu became bad on the long run
-right now i am swithing the old psu (corsair tx650) to other psu (seasonic s12II-620 bronze)
-About the memtest it ran only one time because it took longer than expected ( i ran it on default)