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What are the pins and voltages of DDR, DDR2 and DDR3?

What are the pins and voltages of DDR, DDR2 and DDR3?

DDR
What are the pins and voltages of DDR, DDR2 and DDR3? In DDR memory, there are 92 single-sided gold finger pins (184 on both sides), 52 pins on the left side of the notch and 40 pins on the right side of the product;
 
DDR2 Memory has 120 gold fingers on one side (240 on both sides), 64 pins on the left side of the notch and 56 pins on the right side of the notch;
 
DDR3 memory single-sided gold finger is also 120 (240 on both sides), the left side of the gap is 72 pins, and the right side of the gap is 48 pins.
 
The voltage of DDR is 2.5V
 
The voltage of DDR2 is 1.8V
 
The voltage of DDR3 is 1.5V
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