I am on 10.6.5 with the graphics update 1.0, ATI Experimental RC5, DSDT. I don't think it would make a difference reinstalling just to come where I'm alredy at.
I consider my self a "power user" if I can say that. I have worked with hackintoshes since early Leopard, and I have build 30++ hackintoshes the last two years.
"(Make sure you use the latest iboot, or your usb may not function properly)"
-This i have done in my own DSDT, I have the USB ports fully functionaly, I can even charge my iPad with the hackintosh.
Only files in my Extra/Extension folder is fakesmc.kext, 889audio kext, the rest is done by DSDT including the IOAHCIOrangeIconFix...
UPDATE:
Installed Windows, extractet the rom 1002_68b8.bin, rename it to *.rom, put it in the Extra folder, added UseAtiROM=yes to com.apple.boot.plist. No difference.
Re-installed OSX 10.6.3 Retail ( on a spare drive I had ), Combo update 10.6.5, Multibeast with ATI Experimental Chameleon, DSDT, 64bit com.apple.boot.plist.
Used the same ROM, tried all Frambuffers on page 12 on this post. No luck there either.
Guess I'm returning this card and buying me a Apple HD5770 Card