The slowest member of the Atom Z600 series will run at 1.2GHz, the fastest (for smartphones) will run at 1.5GHz. While multithreaded performance on a dual Cortex A9 at 1GHz approaches that of a 1.2GHz Moorestown, nothing can touch the 1.5GHz part. Single threaded performance is just as impressive.
The Sunspider score is super impressive as well. Intel is posting a sub-2s Sunspider score, the best we've seen thus far on a ARM based platform is ~10 seconds on the iPad
http://www.anandtech.com/show/3696/i...ne-processor/1