As I stated earlier on this thread, by now, I have taken apart at least 5 Retro Duo systems before...I've seen 3 different motherboard revisions, and by this I mean the same layout but different IC's.....At one point, one of them did in fact had a slower crystal, therefore the SNES side games did played at a slower rate...

Not sure, but maybe this have to do something with the 2.0 label....