I test memory using Memtest86+ but no errors (but tested them separately. I tried play some games with them separately too and no BSOD) I tested all the ram slots and it seems fine with I use 1 of them, but when I try to use 2 the BSOD returns. My computer have a little more than a year and I never get any problems. The BSOD who usually appear is IRQL_NOT_LESS_OR_EQUAL. My minidump folder is empty, I don't know why. Forgot to say. When I try use two rams now seems like the computer take some more time to turn on or sometimes it's don't even turn on.