Yes! Thanks so much! (I'm now stalking your other comments and learning a lot...) The Wii example of non-matching architectures looking at the RAM together is

Yes! Thanks so much! (I'm now stalking your other comments and learning a lot...) The Wii example of non-matching architectures looking at the RAM together is especially wild to me. If I wanted to run my x299 Hackintosh + Windows (+ Linux?), would you be able to recommend an existing hypervisor that could do it? I'd be okay dedicating cores/ram/storage directly, but thinking it through I guess to be "useful" (in the sense of making testing things/switching more convenient) at least some IO would need to be shared/handled by the hypervisor and passed along; and perhaps the complexity of setting it up would never outpace the finite number of reboots I could do instead. (And once the higher-perf M chips arrive, I'll probably stop booting the hackintosh side anyway; and linux in a standard VM is fine for my purposes.) If your hypervisor is available publicly (now, or later) I'd love to take a peek; sounds like very impressive work.