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The voltage of Pentium M and Celeron M can be classified as general voltage, low voltage and ultra voltage. The lower the voltage is the smaller the power consumption and heat production are. However, the lower the voltage is, the lower main frequency is, and the lower corresponding performance is. Pentium M processors also can be classified as 533MHZ and 400MHZ according to the Bus frequency. The performance of 533 Bus is better than 400Bus, but the quantity of heat and power consumption are higher. At present, the products of 533Bus are just applied to general voltage CPU, and the low voltage and ultra voltage are 400Bus. Pentium M processors have two marking methods by now: the Dothan are all start by 7 and two numbers followed; as to Mobile Pentium4, it starts by 5, and Celeron starts by
The products whose name end by 0 all adopt 533FSB general voltage; the products whose name end by 5 all adopt 400 FSB general voltage; the products whose name end by 8 all adopt low voltage; the products whose name end by 3 all adopt ultra voltage. This rule also applies to Pentium M and Celeron M, the mere difference lies in that the Celeron M all are 400 MHZ, and no low voltage, therefore, the Celeron general voltage only has type which ends by 0, no 8. Basically speaking, the principle of Intel is to inform the users that the larger the number is the higher class the products are. Nevertheless, there are also several exceptions: For instance, code number of the ultra voltage of 1.2GHZ(753) is bigger than code number of the higher main frequency of the general voltage of 1.7GHZ（735）; the code number of low voltage of 1.5GHZ（758）is bigger than that of the higher main frequency of general voltage 1.8GHZ（745）, which can be comprehended as that in the same series, the bigger number is, the higher price the processor is. For another example, the same main frequency processors may have different code numbers, e.g. 1.6GHZ Pentium has two serial numbers---No.725 & No.730, the difference lies in that the 730 uses 533 FSB, and the 725 uses 400FSB. 730 has better performance than 725, so we can come to conclusion that the bigger the serial number is ,the higher price the product is. And with the same main frequency, the CPU price of low voltage plate is higher than general voltage, and the code number is bigger as well.
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