Cache Memory

Cache Memory is fast memory that works between the processor and memory. The cache holds data that was recently used by the processor and saves a trip back to the main memory. The first two levels of memory are contained in the processor itself. L1 cache is the first level of cache, typically contained in the processor. The third level of memory is the L2 cache, contained on the motherboard; the benefit is that it will run at the same speed as the processor, and cost less to put on the chip. The fourth level is the L3 cache now that some processors include L1 and L2 cache on the chip, it becomes L3 cache. Usually, it runs slower than the processor, but it’s faster than the main memory. The fifth level of memory is the main memory. The sixth level is a piece of the hard disk used by the Operating System, called the virtual memory. Most operating systems use this when they run out of main memory and can be changed whatever amount is need depending on the amount currently used.