Your RAM will work fine. I just assembled a build with a similar Gigabyte board: http://www.gigabyte.com/products/product-page.aspx?pid=4125#sp
I used 1333MHZ sticks and didn't even have to O/C the memory. CPU-Z showed them running at 667MHZ (x 2) without doing a thing. Even if your board only runs them at 1066MHZ, you can bump the speed up in BIOS with no problem. Or leave it as is.