The addition of caches reduces the frequency or duration of stalls due to waiting for data to be fetched from the main memory hierarchy, but does not get rid of these stalls entirely. In early designs a "cache miss" would force the cache controller to stall the processor and wait. Of course there may be some other instruction in the program whose data "is" available in the cache at that point. Out-of-order execution allows that ready instruction to be processed while an older instruction waits on the cache, then re-orders the results to make it appear that everything happened in the programmed order.
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