In patch notes they said it is a driver problem and offered a temporary solution. I tried it before applying the patch and it removed 99% of freezing problems that happen on dual core CPUs with CatalystAI enabled. For Core 2 Duo owners that patch did not fix the freezing problem they must manually change jobs_numThreads variable to 0. It did not work from .cfg but it did by adding +cvaradd jobs_numThreads -1 as a command parameter. Must have AMD_Catalyst_11.10_preview2_Win7_Vista driver installed for fps boost and CatalystAI enabled in order to get rid of texture artifacts. There is no more freezing for me even when running in 2560x1600, rest can be fine tuned by using custom rageconfig.cfg parameters that circle the forums.
I still do not understand how ignorant they might have been and not test the game on dual core systems with ATI cards before the release.

We all wonder the same... thanks for the info.