R9 280X and Mantle Feedback

My BF4 with Mantle feedback.  I am using an ASUS R9 280X GPU and last night installed the 14.1 drivers.  I fired up BF4 and selected to use the Mantle API and restarted the game.  The first thing I noticed is that I can play on Ultra settings and my frame rate stays between 90 and 119, where I have it capped (120 hz refresh rate).  I felt very smooth with no input lag.  However, I crashed twice with "bf4.exe has stopped working" and in the Windows Event Viewer it listed mantle.dll as the culprit.  While the gameplay is very smooth, I have noticed an occasional CPU spike while monitoring the performance overlay in game.  I did not experience this CPU spike using DX11 API.  I understand that this is still a beta Mantle driver and these issues will hopefully be resolved with future releases of AMD drivers and BF4 patches.