honestly clock speeds on processors made by different manufacturers mean nothing, of course a 1.2 Ghz snapdragon will be faster than a 1 Ghz snapdragon. But you can't compare a samsung processor with a Qualcomm processor based on clock speed alone.
This is one of the reason's I'm considering replacing my N1 with the inspire rather than the atrix. I would love the dual core and 1 gig of RAM, but I can't live without custom ROMs.