15-Way Open vs. Closed Source NVIDIA/AMD Linux GPU Comparison
Aside from the Radeon HD 6450 performing rather strangely (in a positive direction) with the open-source driver, the results are more along the lines of what was implied from the past two Phoronix articles with the unmerged results.
The open-source Mesa/Gallium3D drivers tend to really struggle for the Reaction Quake 3 game compared to the closed-source drivers. The AMD Catalyst driver was doing better here than NVIDIA's binary blob.