What is the return policy on the graphics card you are looking to purchase? Might have to bite the bullet to find out for sure. To be honest, I doubt there are very many manufacturers out there who are going to make a statement about compatibility unless they have specifically tested their video card in the motherboard you have, and then they usually make compatibility lists. To further complicate the issue, AMD did not make the graphics card you are wanting to purchase, they made the processor on the graphics card, and so you really are wanting to ask the manufacturer of the card.
Frankly, I'm a bit put-off about all of the folks on here claiming compatibility issues without backing them up with anything.