Even author by self admits that there is something wrong with the benches, which is not surprise since an unstable alpha version of OS was used and probably this version know nothing about the new hardware:

What is important to keep in mind though is that Intel Turbo Boost Technology was disabled on the processors during testing, since this functionality had not worked under Linux for increasing the clock frequency but instead appeared to cause some sporadic performance problems...

What is also missing from the equation is any thermal monitoring support for the P55 / Lynnfield processors using LM_Sensors on Linux, though that should come with time. Update: after starting to see a flow of Windows-based reviews today, it looks like there are some more serious Linux + Lynnfield problems at hand, which we are currently investigating.