My pc is comprised of an r9 280, i5 4690k and 8gb of ram. I run the 14.12 on windows 8.1 and have also tried the later beta drivers. Whenever I use mantle for about 30 minutes I crash. My temps were fine, my cpu never over 60 degrees and my gpu never over 70. The only info I could find is a small crash report which says display drivers have crashed but have recovered, or something to that nature. After that occurs battifield 4 becomes unresponsive and I have to force it close with task manager. I've done clean uninstalls with ddu, underclocked, overclocked and even flashed my mobo. Nothing has worked. I can use dx but with a giant performance hit. This also seems to happen with dragon age inquisition. Half the reason I bought the r9 280 was for mantle support but it hasn't worked for me yet. Any help will be welcomed because I'm at my whits end.