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So why has the memory RAM, and register to have more cache (L1, L2, L3) to do? Birth register and cache to overcome the bottlenecks where CPU speed is too fast, while the speed of RAM will not be caused by "dead" because no time to put the data RAM to CPU processing. As mentioned above, the graphics register with extremely fast speeds, almost equal to the CPU, cache, it has a slightly lower rate, but still faster than RAM. If there is no data in the register CPU needs, it will look in the cache. If so, processor, otherwise continue to come from RAM. Similarly, if the data RAM has no CPU needs, it will find a permanent storage drive, is the HDD, SSD, memory cards, eMMC chips, ... more you find, the more time consuming. Pyramid structure above the main computer memory and CPU will find turn from top to bottom.
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