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A resounding "sort of!" You could, but it would defeat the point of having a cache to begin with.

Physically, the cache(s) of a computer is (are) located closer to the CPU than the RAM - so even if you replaced the RAM with a higher-speed memory, the part that was further away from the CPU would take longer to access than the part that was closer (although the difference would be very small). Cache is also much more expensive than RAM to create, although that doesn't mean it's impossible, and the speed of access is still limited by the speed of the FSB (Front Side Bus). Although cache may have a faster access time than RAM, it is not efficient (cost-wise, at least!) to simply cache everything because you don't necessarily need to use everything right away all the time - cache exists to give you faster access to time-expensive data that you use often. It could get to the point where even your cache would need cache!

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Q: Can RAM be totally replaced by cache memory?
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