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What is a Last Level Cache?

A last level cache (LLC) is located furthest away from the CPU while also being the closest to memory (RAM). An LLC contains a larger total capacity when compared to the higher level caches in the cache hierarchy. However, it is the slowest cache from the cache hierarchy but still faster than memory.

What does an LLC solve?

An LLC reduces the latency of memory being accessed (high latency) in order to improve overall system performance.