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What are the mhz for the different PC speeds?

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memory does 8-bits per cycle. 200mhz*8-bits =1600megs/sec

DDR does 8bits on the rise and fall of each cycle so its 200mhz*16-bits = 3200

pc3200 = 200mhz
pc3500 = 218.75mhz
pc3700 = 231.75mhz
pc4000 = 250mhz
pc4200 = 262.5mhz
 
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