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What are DRAM chips? SRAM chips?

What's the difference, and how are they implemented?

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Dynamic/static random access memory chips.

Both store data. But DRAMs are slower for access time, doesn't indefinitely hold states, and is susceptible to electric noise (unlike SRAMs).
However, they're about 100x cheaper than SRAMs.

As a result, DRAMs are still used, and are used for main memory. SRAMs are used for CPU caches.
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