I should also mention that you will need to use the jumpers on the board to force support for the older CPU. Read the manual. If you want a better board for Crossfire then you may also wish to consider.
ASRock P45X3 Deluxe $99.99http://www.newegg.com/Product/Product.aspx?Item=N82E16813157164
The only issue I have with that board is that it uses a chip to divide the lanes, like old school crossfire and SLI boards, rather than doing it automatically as most P45 boards do.