What is the advantage of having a bigger cache on a CPU?

• A. A larger cache gives the CPU faster access to more data so reduced processing times.
• B. It increases the number of cores.
• C. It stores all programs permanently.
• D. It cools the CPU.

Answer: (A)

When the cache is larger, more of the data and instructions the CPU will need soon can be kept right near the processor, in a storage that is extremely fast. Caches are much quicker to access than main memory, so if the needed data is found there (a cache hit), the CPU can fetch it immediately instead of waiting to go out to RAM. Increasing the cache size raises the chance of having the working data already cached, which lowers the average memory access time and helps the processor complete tasks faster, leading to shorter overall processing times.

Keep in mind that caches are small, fast, volatile memory used to speed data access; they aren’t intended to store all programs permanently, and they don’t increase the number of cores or provide cooling for the CPU. There are tradeoffs, since bigger caches require more chip area and power, with diminishing returns as size grows.