DDR:- In computing, a computer bus operating with double data rate (DDR) transfers data on both the rising and falling edges of the clock signal.[1] This is also known as double pumped, dual-pumped, and double transition.
Some salient differences between DDR generations(source wiki):
To summarize in short:-
- DDR RAM transferred data on both the rising and falling edge of the clock giving it twice bandwidth than the preceding technology (of SDRAM).
- DDR2 improved bus signal that enabled it to operate the data bus twice at the rate of DDR RAM.(Faster)
- DDR3 had focus on using low voltage for reduction in power consumption. (More power efficient).
- DDR4 even lower voltage and higher device densities(upto 2GB in a channel, table below) and faster bus speeds.
Some more detailed differences:-
source:- Micron Technology, Inc. - DDR3 to DDR4
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