Exactly what Ibidem said. Frequencies on x86 != Frequencies on m68k or any other architecture.
Sadly because people are stupid, that's one of the main reasons Apple went to x86, because IBM and the others who make PPCs weren't cranking up the MHz/GHz numbers fast enough.
It's all perception, no one has given a crap about the raw MHz. The MIPS on the other hand, is what you want to look at, and from looking at the wikipedia entry on that;
https://en.wikipedia.org/wiki/Instructions_per_second
There are some Freescale processors that have more MIPS and yet don't require the cooling / power that the Intel processors use. They would be perfect in routers, modems, switches, network appliances, etc.
Not everything that Linux does is for desktop usage.