Main computer memory is usually DRAM because of high density and low cost while cache memory is usually SRAM because of high speed.

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DRAM (Dynamic Random Access Memory) is used for main memory due to its high density and low cost, which allows for larger memory sizes at a lower price. SRAM (Static Random Access Memory), on the other hand, is faster and thus used for cache memory to provide quick access to frequently used data and instructions, despite its higher cost and lower density compared to DRAM.

Main Computer Memory Is Usually DRAM Because of High Density