Updates to GW2 and to AMD drivers have improved performance on my system by a pretty noticeable amount. In my case, FPS was increased by over 20% if I compare my day 1 FPS in GW2 vs my current FPS. Now, it could be an even larger difference, but I play with Vsync, and that little bump put me at a steady 60 FPS.
Anyway, point is that performance improved a lot since day 1, so that the numbers presented here aren't going to be very accurate. I saw significant gains on an AMD GPU, but certain Nvidia GPUs were more problematic as far as drivers go.
So, what good are these numbers now? Hierarchy comparing GPUs is compromised greatly. The benchmarks also don't reflect real world performance. CPU benchmarks lack common processors like the Phenom II and Core2 Duo....
Unfortunately, this article is in serious need of a LOT of updates. In it's current form, it gives a pretty blurry picture.