Question: what means processor stepping in AMD (e3 or e6)? 

Answer: I believe this is where the processor slows down when the workload is low, and some of its cycles are not being used. This means that energy use is lower, and cooling does not have to be as intensive, hence the "Cool 'n' Quiet" branding for these functions.
This question from the Yahoo Q&A forum is categorized in the topic: Science & Mathematics