The processor that gets disabled on an ordinary accelerated system, is only the one that comes as default with the Amiga, the one that you cannot manually unplug by disconecting a card.
Blizzard PPC accelerator boards come with two processors on board, a 68k (either a 040 or a 060) and a ppc, they continue to run both at the same time, only the host Amiga default one gets disabled.
