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The memory hierarchy in most computers is as follows:
* [[Processor register]]s (– fastest possible access, only hundreds of bytes)
* [[Level 1 (L1) [[CPU cache|cache]] (– often accessed in just a few cycles, usually tens of kilobytes)
* [[Level 2 (L2) [[CPU cache|cache]] (– higher latency than L1 by 2x- to 10x, often 512KB or more)
* [[Level 3 (L3) [[CPU cache|cache]] – (optional) (higher latency than L2, often multiple MB's)
* [[DRAMPrimary storage|Main memory]] ([[DRAM]]) – may take hundreds of cycles, but can be multiple gigabytes)
* [[Disk storage]] (– hundreds of thousands of cycles latency, but very large)
==See also==
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