The link you provided is regarding 8600 cards. Do you not have a 9600?
I see lots of users with 9600/P5Q combinations when I search. I see some with problems for assorted things, as always, but others running fine. There is some controversy about this 2.0/1.1/1.0 issue.
You may want to check this post and the thread in general:
http://www.avsforum.com/avs-vb/showt...7#post14739637
If ASUS didn't include backward compatibility for 1.1 that is truly a colossal blunder; my guess would be that they
did include it in the architecture but whoever wrote the BIOS did something wrong and this would be corrected by a BIOS update to come[if folks can wait that long].
But I'm guessing.