Hi ,
You can use Bulldozer with the latest beta BIOS GA-890GPA-UD3H rev.2.1 ,or at least this was Gigabyte s statement along the BIOS release notes some months ago (they have deleted that ).
http://uk.gigabyte.com/products/product-page.aspx?pid=3516#dlThe problem is that some features will be missing and that the BIOS being a beta has been reported to have some issues regarding memory compatibility.
I would advice you to either contact Gigabyte for some newer beta BIOS ,either to buy a new motherboard.
Good CPU choice over there ,i m personally surprised by it s little brother FX 4100 right here