07_Caches - Memory Hierarchy Caches Virtual Memory Readings...

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Memory Hierarchy: Caches, Virtual Memory Readings: 5.1-5.3, 5.5 Big memories are slow Processor Computer Memory Devices Fast memories are small Control Datapath Input Output 136 Need to get fast, big memories Random Access Memory Dynamic Random Access Memory (DRAM) High density, low power, cheap, but slow Dynamic since data must be “refreshed” regularly Random Access since arbitrary memory locations can be read Static Random Access Memory Low density, high power, expensive Static since data held as long as power is on Fast access time, often 2 to 10 times faster than DRAM Technology Access Time Cost/Capacity SRAM 1-7 cycles 1000x 137 DRAM 100 cycles 50x Disk 10,000,000 cycles 1x
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