Over the years, SBCs have seen significant improvements in both processing capabilities and software compatibility.
I would guess that running a Pi on a single monitor at 1080p would probably provide a decent experience for most people. The lack of robust hardware video encode/decode is a big downfall though. It ...
A lot of open hardware projects inluding Amiga accelerator cards and C64 VIC chip replacements have come out over the last few years that are basically "slap a Raspberry Pi on a custom PCB and emulate ...