AMD's have a lower overall speed, shown in gHz, from what I've seen. But that doesn't mean alot -- my computer (1.6gHz Athlon 2000) still owns my friend's 2.something gHz p4 in everything...
I don't think any Athlons currently clock that high, I believe the Athlon 3000 clocks at like 1.9 or 2.something low? Could be wrong. Athlon owns though