Though your Mac may run on Mac OS ordinarily, you can install Windows Vista on Intel Macs. It must have great significance to check if there are some performance difference between these underlying OSes or not. Here, compare following reports measured on an identical MacBook Pro hardware:
Remember VW7.4.1 is adopted on Vista and VW Pre-RELEASE 7.5 (midway in development) is adopted on MacOX X, because you don't have VW7.4.1 for Intel Mac. This inconsistency may or may not have some effects on the measurements above.
Please refer to Legend of result summary list for the meaning of each column in the heading (abbreviated as crt, shw, etc.).