Originally Posted by Phanto
If I'm correct is like a "mini revision" that they make to the CPU so it can run cooler an more efficient.
actually phanto your almost correct, the g0 stepping isn't a "mini revision" its quite a large one since the letter changes ( by quite a few ), as wiki explains:
"Typically, the first version of a microprocessor comes out with stepping A0. As design improvements occur, later versions are identified by changes in the letter and number. Changes in the number (for example, A3) indicate minor design changes, whilst changes to both the letter and number are made following more extensive changes (for example, B2). Stepping allows consumers and servicers to identify a microprocessor's version."