Posted this in the AMD drivers section, so sorry for ducplication.
Oh dear... well looks like I['m one of the few who finds Mantle BAD. Was hoping for some serious FPS/smoothness.. adn this is my findings.
Switching between DX11 and Mantle, on various levels, Shangai/Dawnbreaker/Caspian... I get massive CPU spiking in Mantle to the point that the game is jumping/jerking... Igave it a minute to ensure all textures loaded etc etc but to no avail, it runs badly on my machine. Shame, as they specifically state that 4 GPU's are catered for... switching back to DX11 and it's same old solid performance but smoother, I think they have the frame thing sorted and plays very smooth... No matter what I do, I can't get Mantle to run smoothly...
On the graph to analyse the performance, normally the GPU's are literally smooth with no peaks, then as soon as CPU spikes, the GPU's go mental... so not what I was expected, I expected Mantle to stop the CPU spiking thus making the GPU's behave nicely!
Anyone else got 4 GPU's and are they playing ball?
EDIT: Also, 75% of the time with Mantle enabled, the game just won't load
sits there saying I'm in the server, then basically just not responds. I have to delete the profile, lose all my key bindings to be able to get back in and get to DX11 again... to me, BETA means this kinda thing shouldn't happen as it's a basic prerequisite.