Overslop
Mobo - Gigabyte GA-EX58-UD5 (latest beta BIOS)
CPU - I7 920 D0
RAM - OcZ Gold 6GB (2GB x 3) DDR3 1600Mhz
PSU - Corsair TX750W
Graphics - 2 VTX 5850s - MSI BIOS on both
OS - Windows 7 Ultimate 64 bit
In Vista Ultimate 64 on the 9.10 driver I used the HDMI socket on card 1. I experienced green pixellation in MKVs. Switched to the DVI socket and everything was fine for a little while. Then MKVs frequently crashed the driver and made the far right of the screen a jumpy mad hippy pixel party.
Upgraded to Windows 7 Ultimate 64 bit and the 9.11 beta drivers. So far the only issue I have had is that downloaded video files (avi, mkv etc.) have a slightly (but very annoying) frame rate slow down issue. It isn't constant but occurs quite frequently. Not even sure if the 5850s are the cause, but it seems very likely. Have eliminated the codecs being at fault by using both K-Lite's latest, as well as VLC media player which has its own built in.
Gaming has not crashed at all but Crossfire causes bad juddering in Bioshock. Not sure if that's the cards or the game. On my previous rig, Crossfire didn't cause juddering in this game, but using OS mouse acceleration did...
Will try some other games using Crossfire to see what the results are like.