Drawbacks
Processors implementing the instruction queue prefetch algorithm are rather technically advanced. The CPU design level complexity of the such processors is much higher than for regular processors. This is primarily because of the need to implement two separate units, the BIU and EU, operating separately.
As the complexity of these chips increases, the cost also increases. These processors are relatively costlier than their counterparts without the prefetch input queue.
However, these disadvantages are greatly offset by the improvement in processor execution time. After the introduction of prefetch instruction queue in the 8086 processor, all successive processors have incorporated this feature.
Read more about this topic: Prefetch Input Queue
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