AnandTech takes a closer look at why Intel's latest Pine Trail Atom platform isn't much faster than the first Diamondville Atoms that were released in 2008. You can check it out over here. The site blames it on a lack of competition, as Intel is still using the same Bonnell core as Diamondville but placed it next to an on-die memory controller to save time and money.
When AMD integrated a DDR memory controller with the K8, we saw a big drop in memory latency and tremendous boost in performance. When Intel did the same with Nehalem the results were similar. Yet when we reviewed Pine Trail we saw virtually no drop in memory latency and very few situations where performance actually improved. In fact, it was only on the dual-core desktop Pine Trail system we reviewed that we saw any tangible performance gains..