Data Rates Calculation Question

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The discussion centers on the data rates of PCI expansion buses, specifically the calculation of 133MBps and 266MBps based on their operating frequencies of 33MHz and 66MHz over a 32-bit channel. The original poster notes that when multiplying 4 bytes by the frequencies, the results are 132MBps and 264MBps, suggesting that the figures in the study guide may be rounded down from the more precise values of 33.33MHz and 66.66MHz. The conversation highlights the importance of accuracy in technical specifications and the common practice of rounding in educational materials.
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My A+ certification study guide says:

"PCI expansion buses operate at 33 or 66MHz over a 32-bit (4 byte) channel, resulting in data rates of 133 and 266MBps, respectively..."

How did they get 133 and 266MBps? I multiplied 4 bytes by 33 and 66 MHz and the products were 132MBps and 264MBps, respectively.
 
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The frequency is really 33.33 or 66.66 MHz. For some reason, these numbers were usually rounded down.
 
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