The Atom 270 in the Eee PC literally had unbelievably good latency - as in I don't believe it at all. The Atom 330 based D945GCLF2 had roughly what I'd expect for DDR2 at that speed.
RightMark Bandwidth
The Atom 330 based D945GCLF2 had 12% more memory bandwidth than the Atom 270 in the Eee PC, which is not a huge difference, but every little bit helps :-)