its CACHE memory.

A CPU cache is a cache 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.
When the processor needs to read from or write to a location in main memory, it first checks whether a copy of that data is in the cache. If so, the processor immediately reads from or writes to the cache, which is much faster than reading from or writing to main memory.

its cache memory.

A CPU cache is a cache 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.
When the processor needs to read from or write to a location in main memory, it first checks whether a copy of that data is in the cache. If so, the processor immediately reads from or writes to the cache, which is much faster than reading from or writing to main memory.