Legit Reviews posted a review on the AMD Catalyst Omega 14.12 Driver Performance with Frame Times in Crossfire A quote from the article:

AMD worked on the Catalyst Omega Driver (Catalyst 14.12) that was released earlier this week for nearly six months. These new drivers bring new features, a ton of bug fixes and of course the usual performance and quality improvements that gamers expect from each new driver release. AMD put so much time and effort into these new special edition drivers that they wanted to name this something different to help them stand out from the crowd. We figured the least we could do is take a look at the performance of the the new Catalyst Omega driver versus that of the previous non-beta driver release, which would be Catalyst 14.9 on our Radeon R9 290 Crossfire setup.

 AMD Catalyst Omega 14.12 Driver Performance with Frame Times in Crossfire @ Legit Reviews