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Think of steppings as something similar to editions to a book (like 1st edition or 7th edition). The letters tend to mean more significant changes & the numbers are smaller revisions. As you know, when you are dealing with millions (or billions) of transistors, it is a very complicated system. Sometimes, after we relase the product, we figure out small changes that can make the product even better. In those cases, we will change the "stepping" of the product & record the change with a letter or number shift, depending on the degree of changes done.
For many products, you can look for a document called a "SPEC Update" which will help to delineate the changes by stepping series.
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