It's impossible for the Jaguar CPU to emulate a processor that is faster in a few respects than it is (per core, some functions).
So it would definitely require a new model, and for practical purposes a compatible CPU as well.
The odds of a full BC xb1/ps4 in hardware or emulation are zero though. It would be prohibitively expensive and a PCB nightmare to boot. Both 7g and 8g are extremely complex, high tdp units of massively differing uarch.
Streaming at best with a tray and play design. Even that is a ton of server resources and prone to issues unless your ISP is godlike.
At the end of the day if you want 7g games, play a 7g console.







