I have noticed this with starcraft2. The open source drivers tend to work better then the catalyst. At least for me.
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I think that part of the deal is that the 'highly optimized' nature of catalyst is often on a per-app basis. In order to look good in benchmarks AMD has spent considerably money profiling and creating optimized code paths for specific applications. If you are not using a particular gaming engine or application that AMD didn't anticipate or put a lot of effort into optimizing then the open source drivers are going to be more competitive.
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I think that part of the deal is that the 'highly optimized' nature of catalyst is often on a per-app basis. In order to look good in benchmarks AMD has spent considerably money profiling and creating optimized code paths for specific applications. If you are not using a particular gaming engine or application that AMD didn't anticipate or put a lot of effort into optimizing then the open source drivers are going to be more competitive.
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