Very good, is it the sync on luma or csync one? Just got to make sure you wire the 64 rgb board to do the same
For the everdrives:
2.5 - region is managed with a switch, can't emulate the real time clock, built in cheat features, I think lacks support for Pokemon Stadium 2 and one other random title with some funky memory management trickery/the real time clock
3 - region is managed with a switch, added real time clock, built in cheat things, supports all titles, has a us port for development
x7 - this is the mega do everything one that can auto detect region as well as all the things the 3 can do/2.5 can't
If you're going down that route try and find a second and v3 by the looks of it, the x7 is pretty steep