X6800 has a lot of perfect conversions Capcom arcade games, as well as Konami Gradius games, an excelent Castlevania game, and a lot more.
It shouldn't be needed a lot of CPU power because i remember very good emulators a lot of years ago (in the time of pentium 100 machines).
The main problem could be the screen resolution, it has really big screen resolution, but only used in some rare games.
Maybe someone could try to port an X68000 emulator?
I think it would be worth.
PD: Don't try XM6 because it is good but really slower than any other emulator, it didn't run well in a Pentium 2...