"http://techgage.com/news/fastest_harpertowns_to_be_apple-exclusive/"
Here's something that indicates the Intel cpu's Apple gets are exclusive fastest/hottest introductions, but like you indicate they do it with fsb, and like the article indicates, that simply a bios setting for a mild overclock that the 1333 cpu can do easily puts both cpu's on an equal footing for clock multiplier and fsb:
"According to rumors, when Intel's Penryn-based processors are released next month, Apple will again have the fastest offering exclusive to them, at 3.2GHz. By comparison, the PC side will have the QX9650 at 3.0GHz available at launch. The good thing in all of this is that the small clock bump doesn't mean much of anything, since a minor flick of a switch in the BIOS would match the same frequency of the 3.2GHz, without as much as a voltage bump."
But you'd definitely have to go out of your way to manually get the fsb on a PC, where as the Apple, they drop it in and it runs out of the box that way, fully recognized. I don't think Apple allows you the flexibility to change fsb's though the bios anyway (automatic product manufacturer settings recognition) ? But as for a PC, Who knows what the bios does when it recognizes the cpu's ? That is, how it displays at post ? That's highly dependent upon the motherboard manufacturer. And even how a program like cpu-z would display the information in Windows ?