AMD pushed another update to their Catalyst 13.2 Beta driver, now at revision 4. Please note that AMD Catalyst 13.2 Beta 4 includes all of the fixes found in previous versions of AMD Catalyst 13.2 Beta) Improves performance in the Crysis 3 Multi-Player Beta by up to 50% when 4x and 8x MSAA are enabled.
More information and download can be found here.