> [...] allows to use PMacs with only one CPU [...] (needs less energy,
> produces less heat (also on NorthBridge) and you can safe 1 CPU for spare.

...or simply use MorphOS 3.10 or newer, which disables the unused CPU ;-)

https://morph.zone/modules/newbb_plus/viewtopic.php?forum=11&topic_id=9353&start=25