Just an FYI, SimBY posted it, but the Starswarm stress test has been updated, i just done 4 runs on it for comparison and posted them in the Starswarm thread
http://forums.overclockers.co.uk/showthread.php?t=18576886&page=8
Interestingly OC'ing the core on the GPU made some difference, OC'ing the mem on the GPU had little impact at first glance, however i think the card processed more batches and stuff so infact was probably working harder for a negligable fps gain, im impressed.
I did a complete uninstall of 13.12 using DDU (Display Driver Uninstaller) and reinstalled 14.1 to test the new update of Star Swarm.
Scenario RTS (the most consistent for me as it has a static camera)
DX = 11.4
Mantle pre update
29.27
Mantle post update
36.14
A very nice update from oxide there on Mantle. It is 224% faster than DX. Off course Star Swarm is taking extreme examples but none the less this is impressive for Mantle. I'm far more impressed by this demo than the farce that is BF4 with the fogging, spiking and crashing.