COMPTIA A+ Practice Exam

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How is PCIe speed calculated?

  1. Lane speed * # of lanes

  2. Lane speed + # of lanes

  3. Lane speed / # of lanes

  4. Lane speed^# of lanes

The correct answer is: Lane speed * # of lanes

The calculation of PCIe (Peripheral Component Interconnect Express) speed is based on the concept of lane bandwidth. Each lane of a PCIe connection has a specific speed, and the overall bandwidth for a PCIe device is determined by multiplying this lane speed by the number of lanes utilized. PCIe lanes can operate at different speeds depending on the version of the PCIe standard in use (e.g., PCIe 1.0, 2.0, 3.0, 4.0, etc.), with each version providing a different data transfer rate per lane. For instance, PCIe 3.0 offers approximately 1 GB/s per lane in each direction. So if a device uses 4 lanes, the total bandwidth would be calculated as the lane speed multiplied by 4, resulting in 4 GB/s. This calculation aligns perfectly with how data transfer works in PCIe configurations, making multiplying the lane speed by the number of lanes the correct method for determining total PCIe speed.

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