Ah, the mysteries of the Gigabyte boards, it is indeed strange my friend.
Here is "evidence" that the board will support 140W CPU but, Gigabyte's own site denies this....... Maybe the image has been faked!
(I don't think so!)
Have you read George Orwell's 1984? He foresaw this situation and the re-writing of information to suit.
My best guess would be that Gigabyte thought that the board would be able to handle the 140W CPU's but found out they didn't later on and revised the blurb to show this.
Not much help if you brought this board in the hope of running a 140W CPU. However, a quick check of the latest AMD CPU's that are now available shows that they are all 125W or less and this could be another reason for the change. Why offer support when AMD have changed the specs so quickly?
I was one of the poor smucks that brought an early Phenom ii X4 running at 140W, which is now sitting in a drawer, if you want to experiment and see if you can get it working in your mobo let me know!