+1 Was having problems with Physx and Atidx11 crashes constantly on 2 HD5770 (CROSSFIRED) 13.1 driver (13.3 beta same issues). Ran dev update, played a few rounds, reverted back. Works perfectly now - no crashes. Thanks for this Bus.
AMD PhIIx6 @3.7, 2 x Asus HD5770, Asus M4A89GTD Pro, ssd, hdd 8Gb RAM.