Just to add some balance to the conversation, I love the UFC. I love MMA. Had 4 trips to the states in the previous 24 months for UFC events, thoroughly enjoyable.
Conor is an extremely talented boxer and I genuinely believe he will land one left hook on Floyds chin throughout the contest. Why? Mainly because I think Floyd will be more attacking than usual due to the fact he will want to knock Conor out and technically Conor is very astute at finding ways to land a leftie. HOWEVER... Conor has a major technical flaw in that he won't follow it up. I think he'll probably only land one as it is, but he can't produce a combination to go with it and one punch won't knock Floyd out. He can't even find combinations in the octagon so fat chance in the ring.
As for the stamina, he doesn't have it. Round 7 will be where it gets tough. He will be blowing. Almost certain of it.
Floyd will win. I'm not convinced he will KO a man that has been kicked and kneed in the face several times to no avail.