The AMD Catalyst 12.3 drivers were released on March 28, and at least one bug was fixed. The release notes indicated the following:
XPlane Textures no longer exhibit flicker and corruption
I can confirm this statement is true. For the most part, I no longer see flickering whether using HDR or regular AA.
As far as performance, The HD 7970 is still not performing at full capacity in X-Plane 10 compared with Nvidia cards. I still cannot tell you who is at fault here. All I can say is that, I’ve been reading, often obsessively, about the HD 7970 since I bought it. From everything I’ve gathered, performance in almost every game or simulator out there is exceptional.
I’m still unsure why X-Plane 10 can’t match the results in other simulators and games. Sometimes it seems like development is Nvidia-Mac centric, despite the fact that the overwhelming majority users are on Windows. It is disconcerting when I can load up any version of Flight Simulator without any real issues.