¿WHY SO MANY MEMORIES ??

We have too many memories! hard disk, RAM, cache, SSD, VRAM ... How does RAM work? Is it better than a HDD SSD? What is the use of Intel's new memory Optane? But why we need so many ...? In this video I explain why they needed so many levels of memories and how humans have managed to solve one of the most important in the world of computing bottlenecks.
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