you can't really make these comparisons. atoms and p4s are likely still faster than a single core rpi3 (remember that emulators are almost always single core, and that ARM is way less performant than x86 per MHz, in most scenarios), and ancient versions of emulators were more hacky than 'HLE'. things like ultraHLE (n64) would run on a toaster, but they were barely 'emulators' at that early stage. even today's HLE emulation is vastly more accurate, but needs more juice.
i don't see anyone spending a whole load of time making a hacky model 2 emulator targeted at raspberry pis. by the time they were finished it would be redundant.