CPU Cache Memory

• Definition: Cache memory is a special type of memory housed within the CPU, known as SRAM, which is extremely fast compared to standard RAM.

• Types of Cache:

  • Level 1 (L1) Cache:
    • Fastest and most integrated with the CPU.
    • Smallest in size.
  • Level 2 (L2) Cache:
    • Slightly larger and slower than L1.
  • Level 3 (L3) Cache:
    • Largest and slowest among the levels.

• Characteristics:

  • Speed: SRAM is significantly quicker than DRAM found in RAM sticks.
  • Cost: SRAM is expensive to produce, which limits its size in CPUs.

• Functionality:

  • The CPU attempts to retrieve data first from L1, then L2, and finally L3 if necessary.
  • Only the most recent and frequently used instructions are stored in the cache to optimize efficiency.
  • The use of CPU cache minimizes the bottleneck due to slower DRAM access.

• Conclusion: Efficient CPU cache usage enhances computer performance by reducing dependence on slower DRAM and ensuring smooth operations.

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