Stepping is a number used by Intel to identify what level of design change a microprocessor was built to. Typically, the first version of a microprocessor comes out with a stepping of A0. As design improvements occur, later versions are identified by a change in the number (for example, A2) for minor design changes and by a change to the letter and number for more extensive design changes (for example, B2). Stepping allows the consumer to identify a microprocessor's current version.
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