, - .
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32 512 . 32 , 512 2 .
SDRAM ( ). SDRAM , . - , ( 2 ) . (Refresh Memory). SDRAM 16 256 . .
(. cache), , .
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- SRAM (Static RAM), , , DRAM (SDRAM). -, 8, 16 32 . , 256, 512 .