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Why might increasing bus width beyond a certain point not improve system performance significantly?

hard📝 Conceptual Q10 of 15
ARM Architecture - Bus Architecture
Why might increasing bus width beyond a certain point not improve system performance significantly?
ABecause software cannot use wider buses
BBecause wider buses always consume less power
CBecause bus width does not affect data transfer rate
DBecause other system components like CPU and memory may become bottlenecks
Step-by-Step Solution
Solution:

  1. Step 1: Recognize system bottlenecks

    System speed depends on all parts working well together, not just bus width.

  2. Step 2: Understand diminishing returns

    If CPU or memory cannot keep up, wider bus does not improve overall speed.

  3. Final Answer:

    Because other system components like CPU and memory may become bottlenecks -> Option D

  4. Quick Check:

    System bottlenecks limit bus width benefits [OK]
Quick Trick: Bus width gains limited by slowest component [OK]
Common Mistakes:
  • Assuming wider bus always improves speed
  • Thinking wider bus reduces power
  • Believing software limits bus width

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