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Most modern (post-2000) CPUs used shared multi-level caches. The level of sharing a specific cache can vary by the design of the processor.

For example, many CPUs will share Level 1, Level 2, and Level 3 caches between all cores. In others (particularly those with many cores), Level 1 and possibly Level 2 caches may be shared only between a certain subset of cores. For example, in certain 16-core CPUs, the design breaks it into 8 sets of 2 cores - each pair shares a L1 cache (8 L1 caches total), with 2 pairs sharing a L2 cache (4 L2 caches total), and all cores sharing a single L3 cache.

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