Z, it is somewhere under a thread you have to have been approved to view. Normal peons don't have access Send a PM to Robert at the Polish National Team and he can add you to the thread. He needs your forum login name ... not password.
He said a GTX 680 does better with the OpenCL app but the GTX 5xx do better with the old app. You can either download NVidia wu (if you have a cuda card in the machine) and then using the app_info you can get the ATI and NVidia to both crunch.
You can also install an app_info that downloads CPU tasks and crunches them on the ATI ... you use this method if you don't have a Cuda card.
They recommend 12.1 drivers (or higher) and that is why I can't try it. My machines are loaded with CAT 11.5 and I won't be back home for another 3 weeks. I'm afraid to try a driver uninstall/install remotely.