I seem to recall seeing something about the 7448 vs C2D benchmarks being done in photoshop CS2 so the C2D was running rosetta and thus much slower. I will check again a bit later.

*Edit

Ok, here is a pic, look at the very bottom. They are using photoshop CS ( version 8 )

http://eshop.macsales.com/images/Items/Graphic7448.gif