I saw those benchmarks and if its the same one then the hardware was so different it hardly made for any realistic comparison.
• Mac Pro w/ 2 x 2.66GHz (C2D), 1GB RAM
• Hackintosh w/ 2.21GHz (core duo), 4GB RAM
• MacBook Pro w/ 2GHz (core duo), 2GB RAM
http://lifehacker.com/software/benchmarks/hackintosh-vs-mac-pro-vs-macbook-pro-benchmarks-322866.php
So how far can you spec/overclock a Mac Pro compared to a PC?