Secondary Caches
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Secondary caches may be off-chip, but still made of SRAM.
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Becoming more popular as the miss penalty for primary caches
grow.
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Secondary caches are typically much bigger than primary caches.
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Block size in secondary caches are also larger.
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Primary caches can be made with fewer blocks and shorter block size
to decrease hit time and miss time (at the expense of a higher miss
rate).
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