MORE INFO REQUIRED:
It is not useful simply saying:
'tearing'
or
'it looks like V-sync is disabled but a little bit different (with some little lines)...'
without posting a picture - or any information about your system / setup / content etc.
Its impossible to diagnose!!
Start by emailing a Catalyst Support Profile
Also email some screenshots or pictures of the problem
Then it might be possible to diagnose...
(cant promise though)
As other users have stated - we use 4,1 and 5,1 MacPros with Q4000 and GTX680 running 10.8 with no issues...
S
