You didnt read the techspot article then.
For measuring performance we are using Fraps, recording the minimum and average frame rates of each graphics card. As mentioned before, for this article we are including a frame rate timeline that should suggest how each graphics card performed at any given moment compared to the others. In games such as Wolfenstein where we'd normally use a pre-recorded timedemo to measure performance we have instead recorded actual gameplay.
They benchmarked using Fraps in game too.