The Atom is a 330, yes?
It's just a dual-core version of the same Atom that's in most netbooks. It's a bit faster than the single core Atom N270 and N280, but it's a lot slower than any Core 2 Duo or Pentium Dual-Core processor.
Here's a Tom's article comparing the newest Atom chip with the dual-core Atom 330 and a low-end Pentium dual-core. http://www.tomshardware.com/reviews/atom-d510-d510mo,2507.html
Go ahead and skip to the benchmark result pages... note that, in some graphs, larger numbers are better. In some, smaller numbers are better.