I've not had experience yet dealing with that specific graphics card. However when looking at the specs on amd's website and the gigabyte link providing one thing that does jump out at me is the pci express 2.0 vs express 2.1 spec (graphics card said conforms to 2.1 while mobo says 2.0 on the specs).
Something to keep in mind that even if it does fit the slot fine it's likely to run at a slower speed possibly (depending on the specification difference, sometimes it's minor other times it's a major change).
Thank you for the reply. With the info I have found on the internet, it seems that 2.0 and 2.1 run at the same speed and it should not cause any problems. Apparently 2.0 and 2.1 have the same transfer rate, it only changes when you go to 3.0.
Well that's good being the only spec that really jumped at me on the spec sheets. Chances are it "should" work. I won't endorse for certain since I've not setup a mobo and card as such config but you're probably fine (unless I missed something else when reviewing the specs).