I think its going to be a gradual improvement that affects all games, particularly directx11 games. Most games are fine, this is just optimization to improve performance and latency, in some titles more than others.
As far as i understand it the Memory Management was written for VLIW5 (cayman 6950 etc), and not GCN, (7970 etc) which is completely different.
So the improvement is because of that, not because there are huge issues already.
excellent - thanks for reply - makes sense