Level 1 Cache [L1 Cache]

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Level 1 (L1) cache, also known as primary cache, is a memory cache built into the CPU.  L1 cache is used by the central processing unit of a computer to reduce the average time to access memory.

The cache is a smaller, faster memory which stores copies of the data from the most frequently used main memory locations. As long as most memory accesses are to cached memory locations, the average latency of memory accesses will be closer to the cache latency than to the latency of main memory.

Synonyms:

Primary Cache

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