Transcription: The dispatch execute unit checks each UOP in the reorder buffer to see if it has all the information needed to process the UOP. If a UOP still needs data from memory, the execute unit skips it and the processor looks for the information first in the nearby L1 cache. If the data isn't there, the processor checks the much larger L2 cache. Because the L2 cache is integrated with the CPU, information moves between them two to four times faster faster than between the CPU and the external bus.
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