When your new card arrives, test it carefully to make sure it works. Last time I did an ASUS RMA I went through multiple cards before getting a working one. In the end, they gave up trying to find a working 280x and just sent me a 970. Their front line support is terrible, I didn't get any real help until I got in contact with an engineer from their Fremont facility. He is the only person I dealt with who seemed interested in actually helping me.
Hmm should probably forward that engineer's contact information to the OP - in case things are not so rosey with this incoming 980 haha.