That's correct. If you remember, Tim Cook described this limits on PPC based products as a "thermal problem" which is what drove them towards Intel. Presumably,

That's correct. If you remember, Tim Cook described this limits on PPC based products as a "thermal problem" which is what drove them towards Intel. Presumably, ARM's licenses don't have this problem, in part, as @rbanffy implies, because the ARM architecture doesn't rely on a single source as the PPC did.