Just for the record, here's my configuration:
Video card: RADEON 5850
Motherboard: Gigabyte GA-MA790X-UD4 (rev. 1.0) AMD 790X + SB750 Chipset
Driver: Catalyst 9.10 (Oct 22, 2009)
OS: Windows 7 Home Premium x64. Clean install on two SSDs in RAID0.
Neither the default Win7 drivers, Cat 9.9 or 9.10 made a difference--Aero lag is still present. By lag I mean that slight frame-skip just before a new program window fully opens, and then the same skip right after you click the window close button (there is
no lag maximizing and minimizing windows, I swear to you).
Games and HD content run smoothly.
I have a 6.7 WEI, with the lowest score represented by my CPU (Phenom II x3). My Graphics and Gaming Graphics are both scored at 7.7. I'm not over-clocked and I have no multi-step OC booster or similar option in my BIOS (even when I hit Ctrl-F1 in the BIOS
to get the advanced options). I'm running at 60Hz refresh, which is the default for my LCD.
I also have the lastest southbridge and RAID drivers from AMD's site.
Not really sure where to go from here! Let's keep this one alive until it's solved since I know a lot of people with the same issue.