Nope, not tried higher NB multi for stability testing, I'll try it after I get max stable CPU found, thanks. I try keeping below my NB safety range. I don't have issues upto 2380MHz NB at 1.3VID with stability. With 9600BE the easy way to catch instability was Sandra testings for me too, but 9850BE is fine upto 2380 - 1MHz more and it fails [freeze/reboot under Sandra loads].

Maybe water would help but with my chip, I'm not so sure.