http://support-prod.amd.com/us/kbarticles/Pages/ATICatalyst108bHotfix.aspx x2 hotfix. " ATI Catalyst 10.8b Hotfix Features: * ATI Radeon™ HD 4870 X2 and ATI Radeon HD 4850 X2 use both Graphics Processing Units (GPU) for high performance * Ubisoft H.A.W.X 2 with forced on Anisotropic Filtering (AF) using ATI Catalyst Control Center can improve performance Instructions: Download and install the ATI Catalyst hotfix from the following location: * ATI Catalyst 10.8b Hotfix for Windows® 7 / Windows Vista® Refer to Article 20870 for detailed instructions on how to properly install the ATI Catalyst ™ hotfix. Note! This hotfix is provided as is and is not supported by AMD. It has not completed full AMD testing and is only a driver update. Applicable Products: This article applies to the following configuration(s): * Hardware o ATI Radeon HD 4870 X2 series of products o ATI Radeon HD 4850 X2 series of products * Software o ATI Catalyst Control Center o Ubisoft H.A.W.X 2 * Operating System o Windows 7 32-bit Edition o Windows 7 64-bit Edition o Windows Vista 32-bit Edition o Windows Vista 64-bit Edition "