A CPU cache is a smaller faster memory used by the central processing unit (CPU) of a computer to reduce the average time to access memory.
L1 (Level 1), L2, L3 cache are some specialized memory which work hand in hand to improve computer performance.
When a request is made to the system, CPU has some set of instructions to execute, which it fetches from the RAM. Thus to cut down delay, CPU maintains a cache with some data which it anticipates it will be needed.
(L1) Level 1 Cache(2KB - 64KB) - Instructions are first searched in this cache. L1 cache very small in comparison to others, thus making it faster than the rest.
(L2) Level 2 Cache(256KB - 512KB) - If the instructions are not present in the L1 cache then it looks in the L2 cache, which is a slightly larger pool of cache, thus accompanied by some latency.
(L3) Level 3 Cache (1MB -8MB) - With each cache miss, it proceeds to the next level cache. This is the largest among the all the cache, even though it is slower, its still faster than the RAM.
Now you know what cache is and what different level of cache are.
And that 6MB value of the L3 Cache in your Intel 4700MQ microprocessor is actually the memory size of that Cache.
Thus Cache improves the overall performance of the CPU but these numbers shouldn't be considered while purchasing any system. Look at the benchmarks of the CPU as a whole. A CPU with similar architecture but with more cache wouldn't make any noticeable difference. The technology these days have advanced to such a point that the specs of a CPU are just meaningless.
Read full article from (9) What is the L1, L2, L3 cache of a microprocessor, and how does it affect the performance of it? - Quora
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