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The DDR SDRAM is a high--speed CMOS, dynamic random--access memory internally configured as a quad--bank DRAM. These devices contain the follow- ing number of bits: 64 Mb has 67,108,864 bits 128 Mb has 134,217,728 bits 256 Mb has 268,435,456 bits 512 Mb has 536,870,912 bits 1 Gb has 1,073,741,824 bits