Here are the scores a few times for Mac OS X and once for Windows XP
The same problem for my Macbook 5.1 with 2.4 GHz, only seen as 2GHz and therefore Novabench gives a lower score. Does Novabench expect the 'standard' CPU speed for the macbook 5.1 (which is 2GHz), or does it measure realtime CPU-speed? Or doesn't Novabench control speedstepping in the right way? When I use Novabench for Windows on the same Macbook 5.1 in Bootcamp with Windows XP the higher cpu speed is seen and the score is also higher. I thought this might help to find the bug....