On Tue, 22 May 2007, Stefan Dösinger wrote: [...]
But why would they prefer external stuff over the games' built-in benchmark features?
I believe some test sites like to build graphs of framerate over time. This lets them extract not only the average framerate, but also the minimum and maximum framerate, compare the graphs of different graphics cards / machines, etc. I assume that games don't always provide enough data which is why they'd use third party tools.