CPUs try to get around these speed impedance mismatch by using layers of caches to avoid having to go to RAM for data. They also use lookahead to try to get fetch data from RAM long before it is needed. They also use dual cores, so that one CPU can continue operating while the other is waiting on RAM. They also use dual ported RAM so that two independent RAM fetches can go on simultaneously. I have this is my own machine. It is the main feature than speeds it up.
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