Just based on synthetics, I would say they would perform about the same.
Hmmm, I would tend to disagree. While I have, and still do, love the athlon II x4 6xx series of cpu's, I'm not totally convinced I would be happy with an x3 445, unless of course that fourth core was unlocked. I just can't say that a 3 core athlon ii will be able to deal with the heavy calculations required in games as well as I would personally like. That said, the 5770 is faster, certainly. But if you are gaming at 1440x900 or lower, I really can't see much of a difference between it and the 650m.
I would tend to think the laptop would be better, due to the substantial processing power upgrade.