Also, even you you wanted to make the claim the G4 has fins it still is not much better than the Nexxos XP. And what is the thing that would put the G4 over the Nexxos? Probably the little pins in the cups.
Note I didn't add the G5 because the G5 is SILVER so unless there was a silver Nexxos XP we can't realistically compare the performance of the design.