don't ask OS4 q's , noone will tell u for sure, and it is pointless, it is not available now for classic amigas...
on classics, the ppc part is always "sleeping" unless a program tries to use it.
in 3.9 the ppc part is utilised in various ways, but you must install ppc parts... like datatypes (
www.warpdt.co.uk are great ones) or maybe make amigaamp decode mp3's with the ppc...
think of it as a 2nd utility cpu for now...