I still get negative crossfire scaling with the 11.11b drivers.
I am seriously considering going nvidia next time around just because of drivers.
I'm getting worse. I'm now getting a crash to desktop whenever I walk outside. It seemed to be okay since I was in a dungeon, but as soon as I got out it crashed. With or without hayden's fix, with or without the 4gb patch fix, with both ini files deleted and recreated, I've tried it all. Even loaded an old save, where I was outside at the time, and it crashed to desktop instantly on that save. I'm going to roll back to 11.11a again and see if I can recover the game.
EDIT: Seems to be that anisotropic filtering is causing my crashing in 11.11b. If I turn anisotropic filtering and anti-aliasing all the way off, with everything else on Ultra, I'm no longer getting the crash to desktop when walking outside. On 11.11a, I had AA off and filtering to 16x.
EDIT 2: I too am getting way worse scaling from 11.11b than with using RadeonPro. With RadeonPro I see what seems like a very small bump, but not much better than a single card. With just 11.11b, it's fine outside but terrible in the cities. What's worse is that it's running worse now with 11.11b and crossfire enabled than it did with 11.11a and crossfire disabled and the settings LOWER. 11.11b with RadeonPro using the Oblivion profile is fine though. What a mess AMD is making of this.
EDIT 3: Strangest of all, after all these updates and changes, Hayden's 0.4A now has broken maps for me, where 0.4A was always perfect. Now 0.4B is the one with working maps, where 0.4B never worked for me before. It's like my computer is possessed with demons (demons that don't want me to play skyrim). I believe I have it all worked out now.
In the end, I'm 11.11b, AA off, filtering 8x, RadeonPro using Oblivion profile, Hayden 0.4B. Wtf.