I got my sapphire 4870x2 to work great without any problems with the whql 10.8 drivers. just edit a profile to say 778 and 930 and name it 778. thats my bcbf2 profile because i found out that some games dont like the gpu overclocked past 778, and dont use a third party oc tool. than my other is 835 and 930 named 835 for other games that dont crash with that profile and using a third party oc tool. i bet if you do this you'll have less crash and more fun gaming. alot of new dx11 games do not like third party oc tool or override driver functions. just try it if your having problems. and my 3d clock are running at the speeds their suppose to, no more 2nd gpu running 500 then switching back.