I must have a really cruddy 8320, can't get it IBT stable above 4.6 with anything, been up to 1.52v but could break 4.7!
you will see back at the start of this thread its hard to get cpu stable on prime and ibt over 4.6 due to the massive load they put on cpu
if it games or whatever you use it for without crashing its as stable as your gonna need dude
mine is @ 4.9ghz and not prime or ibt stable but games all day long aida 64 is good as it puts more realistic loads on cpu as gaming would
so to cap it off i wouldn't worry a whole lot m8 as long as it doesn't hard lock blue screen ect