However, if you want to fully enjoy the game, then you might need to check your drivers before the big day. Diablo 3 Will Not Support AMD's Catalyst 12.4 Release and if you’re running this version, you will have to set them back to 12.2 in order to play the game.
Just Push Start gives us the story:
Omrakos, a ‘Support Forum Agent’ from the official Diablo 3 forums has revealed that Diablo 3 will not support the latest AMD Catalyst Drivers. If you continue reading the thread, which you can do here. It seems that users with the Catalyst 12.3 release are experiencing the same error, which says that the video driver is not compatible with the Diablo 3 Beta.
There is an easy fix this problem though, as many have found out that if you roll back your drivers to the Catalyst 12.2 release you will no longer see that error. To do this just follow this simple guide form Overclock, and use the drivers posted below. Make sure that you click the one that corresponds to your system.
Read more on the fix here.