Data Rates Calculation Question

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SUMMARY

The discussion clarifies the calculation of data rates for PCI expansion buses operating at 33MHz and 66MHz over a 32-bit channel. The A+ certification study guide states the data rates as 133MBps and 266MBps, which are derived from rounding the actual calculations of 132MBps and 264MBps, based on the frequencies of 33.33MHz and 66.66MHz. The rounding down to whole numbers is a common practice in technical documentation for simplicity.

PREREQUISITES
  • Understanding of PCI expansion bus architecture
  • Basic knowledge of data rate calculations
  • Familiarity with MHz and MBps terminology
  • Concept of rounding in numerical data
NEXT STEPS
  • Research PCI Express (PCIe) specifications and data rates
  • Learn about the differences between 32-bit and 64-bit data channels
  • Explore the impact of frequency on data transfer rates
  • Investigate rounding techniques in technical documentation
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IT professionals, hardware engineers, and students preparing for A+ certification who seek to understand data rate calculations in PCI expansion buses.

darkchild
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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.
 
Computer science news on Phys.org
The frequency is really 33.33 or 66.66 MHz. For some reason, these numbers were usually rounded down.
 

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