Just got my 5970 yesterday. It wasn't detected by catalyst 9.11, but it is with catalyst 9.12 which is out today! Performance numbers are right about where they should be compared to my 5770 ... that is 2*725/850 per GPU. But I understand it should overclock easily to 850 by volting up to the 5870. Is there a way to do this for linux? At the very least, can one volt-up in windows and have it preserved when booting linux (haven't tried it because I don't have windows installed)?