Odd? What is odd about this. I did some research and applied my findings to my network and it worked. I do not see anything odd with it.
Have you tested this out yourself? Sounds like you never have, and your just guessing. I have applied it, and saw the difference. Hence why I posted my experience here. Otherwise I would not have said anything.A CPU boost from 1.6Ghz to 2.3Ghz quad-core might give a "slightly" and I mean VERY slight change in data transfer speeds... We're talking mere 0.5MB/s speed difference.
For you and me yes, but for someone else who is new it may not. Thats why I posted all these possibilities to rule these out.I already have cat5e and cat6 allover my network. That's a no-brainer.
As for your issue, first thing that came to my mind is a driver issue. Apparently you have all the hardware, great, but maybe its a driver issue on amahi. Maybe the Fedora driver needs to be updated.