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RAM  (DDR-1, 2, 3) 

 

DDR means Double Data Rate .SDRAM-- Synchronous Dynamic Random Access Memory.

DDR  is the latest version of (SDRAM)  & Single Data Rate (SDR) . The Frequency and Voltage of RAM depend on the  Data Rate & this  Updated versions  are -- DDR, DDR2, DDR3 .

For example:  The  Frequency of DDR/DDR1 RAM  is 100-400 MHz and Voltage : 2.5-2.6 ;

The Frequency of DDR2 RAM is 533-800 MHz & Voltage: 1.8;

The Frequency of DDR3 RAM is 1066-1333 or higher MHz & Voltage: 1.5;

That’s way we know RAM.