A new AMD Catalyst 15.4 Beta Driver for Windows is now available as promised, improving support for The Witcher 3 and Project CARS running on an AMD/ATI accelerators, though they note a couple of known issues remain for both games involving antialiasing in crossfire configurations. Issues aside, they say the new driver improves The Witcher 3 performance by up to 10% and Project CARS performance by up to 17% on single GPU Radeon R9 and R7 Series graphics products. Thanks Anandtech.