So I've done some more testing on my 295x2 running 14.11.2 drivers with mantle. I did the testing in Haven when you first get there (the crowd is all lined up outside so it seems to hammer your rig). I've disabled crossfire but the CPU spiking is definitely still there whilst running around Haven. Not only that the but the ridiculous mantle loading times also happen - again it's like my computer almost hangs as audio drops out and screen stops moving but then suddenly it loads. In DX11 in haven, CPU usage goes crazy which also causes slight FPS drops but the stutter from spiking is not nearly as perceivable. Mantle definitely limits the crazy CPU fluttering when heaps of NPCs are around it's just the 5 second spikes that need to be addressed. The game doesn't appear to be that taxing as I normally run in DX11 supersampling at a resolution scale of 1.8 (from 1080p) and it is smooth as butter everywhere (even hinterlands) except in towns with hordes of NPCs. As someone mentioned before I saw a german website had done benches and noticed the exact same things, apparently bioware supplied them with an unofficial patch so I'm guessing this going to be addressed soon. @AMDMatt are you aware of anymore developments on AMD driver side?