I'm pretty sure almost ANYTHING smacks around an Atom 1.6GHz. The Diamondville at 1.6GHz is only slightly faster than the Celeron M 900MHz. I have an 800MHz Intel A110 and the 1.6GHz Atom is only about 20% faster in Super Pi, if that.
It definitely wins in production costs. I don't think it wins in performance/watt though. Atoms definitely run on lean power requirements, but at the cost of a lot of performance.