For me at least these releases are not going in the right direction.
All 3DMark Extreme tests were run within the same 24 hours and on the same and hardware with latest 12.7.CAP3 profiles. Catalyst manager was used to uninstall drivers and Crossfire setting was re-enabled (toggled) prior to each test.
12.1a preview / 12.7.CAP3 – 5748
http://www.3dmark.com/3dm11/4214655
12.1 / 12.7.CAP3 – 5732
http://www.3dmark.com/3dm11/4210223
12.2 / 12.7.CAP3 – 5627
http://www.3dmark.com/3dm11/4209958
12.3 / 12.7.CAP3 – 5251
http://www.3dmark.com/3dm11/4210131
12.4 / 12.7.CAP3 – 6155
http://www.3dmark.com/3dm11/4215376
12.6 / 12.7.CAP3 – 4076
http://www.3dmark.com/3dm11/4215044
12.8 / 12.7.CAP3 – 3984
http://www.3dmark.com/3dm11/4215202