How far can I oc the standard 3600 with 1.325v
Lower then the native boost clocks.
So long as there are no poor cores the 3600 will boost to 4.2ghz on all cores using 1.35v or less.
If there are poor cores the all core boost clocks will be limited to that cores speed and if the boost clocks are unable to push that core higher with more voltage then you are also going to be limited by that core.
AMD with this generation removed almost all the headroom left for extracting extra performance making it as close to a maximum performance for plug and play as possible.
That's difficult to say (actually impossible), as every CPU die is different qualitative wise, that plays a major role as overclock ability and voltage requirements concerns.
But i agree with what Gilroar mentioned above: