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The problem with multiple cores beyond 2 or 4 is that the bus providing data to the CPUs is the slowdown. Most processing requires data, and an 8-core machine can’t feed data to the CPUs fast enough to keep them busy. You would think an 8-lane road would allow traffic to move 8 times as fast as a 1-lane road, but if there’s just a single entrance and exit lane and most of the traffic is local then the 8-lane road stays pretty empty.
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