Well I thought that maybe the higher Mhz models were newer steppings, maybe production in one factory is higher quality than the other, so that maybe certain models had a greater MHz potential. At some Mhz intervals, the price seems to suddenly jump, way more than the extra Mhz. But that may also be Intels way to maximize profits, and if that is the case I wouldnt even consider bying the more expensive chips.
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Engage!