"The Radeon HD 6570 and Radeon HD 6670 were originally released at the beginning of the year as OEM products, i.e., available only for computer manufacturers. Last month, AMD released them on the retail market with a suggested price of USD 80 and USD 100, respectively."
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips