Knock on wood it had been fine this try, I was OCing using Intel XTU and I think it may have had to do with having closed out the window, although why it would take several hours for that to cause a crash I don't know. CPU runs about 60 Celsius full tilt, maybe a little over so I wouldn't think that'd be it, memory topped out about 7.4gb of 8, pushing it a bit but not sure that'd be the cause either.