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Memory bit question

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i thought it was 64 bit

and DDR is 64 bit but it just transfers twice as much data (DDR) as regular SDRAM

and dual channel DDR is 2x64 so 128-bit


and the older RDRAM is 16 bit

i850 chipset Dual RDRAM which is 2x16bit so 32 bit

and the newest RDRAM is 32 bit (no DC needed)