What Is Cache Memory?

Cache Memory Storage is a special memory with great speed. It is used for acceleration and synchronization with a high-speed CPU. Cache memory is more expensive than primary memory or disk memory but less than the CPU register.

Cache memory is a fast memory that acts as a distraction between RAM and CPU. Contains frequently requested data and instructions for quick access to the CPU when needed.

Basic Operation

  • When the CPU needs memory access, the cache is checked. When a word is found in the cache, it is to be read in the fast memory.
  • If the PROCESSOR in the target name is not found in the cache. The main memory is in order to read the word.
  • The size of the block can vary from a word (recently got) to more than 16 words, which are closer to the recently arrived at the.
  • Cache memory, the performance is usually measured in terms of accuracy.
  • When the CPU point to memory and finds the word in cache it is said to be the product of a stroke.
  • If the name does not exist in the repository, it looks for it in large memory and is considered to be lost.
  • The average number of hits divided by the full CPU reference memory (hits plus misses) is a one-hit ratio.
cache memory

Levels Of Memory


It is a type of memory where data is to be stored and to be taken directly into the CPU chip. Usually, it is used to register the accumulator, counter, address register, etc., as part of the L1 cache.


L2 cache or secondary cache is typically much more powerful than that of the L1. The L2 store can be embedded in the CPU, either on a separate chip, or a coprocessor, and a high-speed bus system, which combines cache memory and CPU usage. This way, the speed of the main system is not designed to be reduced.


The level 3 (L3) archive is the memory that is intended to improve the performance of L1 and L2, respectively.

(L1 or L2) maybe much faster than that of L3, although the L3 is often twice the speed of the DRAM. With multi-core processors, each core may provide a particular L1 and L2, respectively, the storage, however, they are able to share the L3 cache. While the L3 cache sets with a command, it is most often up to a higher level of the cache.


Level 4-cache L4 cache is a way to link it to Level-3 cache. Which can be accessed by the CPU, and the L4 cache can be accessed by the CPU and GPU.

Level 4 on-package cache was introduced by Intel at the beginning of its Haswell microarchitecture. The level 4 cache, use the embedded DRAM (DRAM), contained in the same package as Intel’s integrated GPU.

This cache enables the memory to be divided sharply between the on-die GPU and CPU and serves as a victim cache to the L3, the CPU stores.

Primary Cache

The primary storage is always at the ready on-chip processor. The storage is small, and its access time is comparable to that of the processor’s registers.

Secondary Cache

The second store is located in between the large storage room, and all of the memory. This is called level 2 (L2) cache. Generally, the Level-2 cache, are also in the chip of the processor.

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