The test in the article was pretty pointless. Gaming... seriously? Who is going to worry about gaming on software drivers? Even the crappiest machine capable of even running those games will have a GPU capable of doing better than that.
Here is a much more interesting test for the performance of this; try out DESKTOP COMPOSITING on something with a horrid crappy CPU, like... oh I don't know... an INTEL Z520!!!!
Things to measure: framerate, CPU load.
Better yet. GNOME. The better software drivers are more important for GNOME since they provide a uniform user interface. These performance gains pretty much obliterates all the "software drivers are useless" hearsay. Great news.
It's still useless since it's maxing out your CPU to do a task even a craptacular integrated GPU would do without coming out of it's lowest power state.