Ok, for you AMD 69xx owners out there (and possibly for other AMD users)
I love Skyrim so much that I decided I'd go ahead and do some "trial and error" toying with the AMD drivers to find the best performance. Now, all I'm going to share with you is what worked for me... doesn't mean it's going to work for everybody, but I've got a strong feeling I've found something good...
First of all, my skyrim is modded (ugridstoload=9... ultra settings, you name it...) So it's pulling all the juice my computer can generate (or should I say all the juice my AMD drivers allow my computer to output...)
I've tested all the recent drivers:
I've tried the 11.11, 11.11a, 11.11b with the latest caps and all... The whole 11.11 series doesn't seem to be stable enough to my taste on my setup... I get a decent performance on single card, but horrible scaling on CF... It's true 11.11b allows a "tiny bit" better scaling, but adds tons of in-game weird behavior, glitches, CTD and other issues (that's a wide-spread thing about the 11.11b... not just me)
So I decided I'd go ahead and test older drivers... I tried 11.9, 11.8 and 11.6... Yup, that took a while, but I believe it was worth it...
Before I tested those, my most stable setup was using the 11.10 drivers on single card config... But there seemed to be a memory leak with those drivers... Especially when I would quick save while in-game, I would notice my FPS drop a fair amount... My former way of fixing this, was to alt-tab out and back in to the game which would most of the time, give me back my original FPS level (or avg...) So 11.10 was quite unstable for me...
Finally, the winner seems to be 11.9, which gives me about the same FPS avg than 11.10 but WITHOUT the stability issues. I get around 45-50 FPS solid all the time, outdoors and indoors (indoors usually goes up to 60) Keep in mind I have "ugridstoload" and lots of LOD tweaks in Skyrim, so that's actually a very good number... And MOST importantly: very stable, no FPS fluctuation, which shows the driver's stable and ready for the job...
So I went ahead and tested crossfire in many ways (OCed, no OC... rename the exe... etc...)
And 11.9 has bad scaling, but not so bad... still a little below 11.11b drivers but at least it's stable... But it's better with my single card config still.
So for those looking for the right driver while waiting for a patch or for AMD to wake up, give 11.9 drivers a try and let me know if you found it to be better than 11.10 or 11.11...