I don’t know, 1.3A should be enough. My Genesis (High def) doesn’t show the dots with the 1.3A supply. My Megadrive (non High def) does. The dots disappear when I use the original PSU or a 9V 2A PSU, but I need the latter for my Gen/32x Combo. So I think it’s the amperage, but this doesn’t explain why the original 1.2A works good. Anyhow, it’s not worth to fiddle around with it since you only see them if you are VERY close to the TV.