The issues you guys have is most likely a driver issue. The drivers are probably some specially tweaked ones, or betas, as the drier number you gave me doesn't have support for the 6xxM cards .
If you didn't contact Asus yet, send them a message and tell'em the issue in every little detail, but be patient, as a new driver will take a while to build.
Btw, sorry for answering so late. I am from Romania and there is a time offset (right now here the time is 14:50)