what is the difference between DDR1,DDR2,DDR3 types of RAM?

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  • 1 decade ago
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    In computing, a computer bus operating with double data rate transfers data on both the rising and falling edges of the clock signal. This is also known as double pumped, dual-pumped, and double transition.

    DDR2 stores memory in memory cells that are activated with the use of a clock signal to synchronize their operation with an external data bus. Like DDR before it, DDR2 cells transfer data both on the rising and falling edge of the clock (a technique called "dual pumping"). The key difference between DDR and DDR2 is that in DDR2 the bus is clocked at twice the speed of the memory cells, so four words of data can be transferred per memory cell cycle.

    DDR3 memory comes with a promise of a power consumption reduction of 30% compared to current commercial DDR2 modules due to DDR3's 1.5 V supply voltage, compared to DDR2's 1.8 V or DDR's 2.5 V. This supply voltage works well with the 90 nm fabrication technology used for most DDR3 chips. Some manufacturers further propose to use "dual-gate" transistors to reduce leakage of current.

    The main benefit of DDR3 comes from the higher bandwidth made possible by DDR3's 8 bit deep prefetch buffer, whereas DDR2's is 4 bits, and DDR's is 2 bits deep.

  • fabre
    Lv 4
    4 years ago

    Ddr1 Ddr2 Ddr3

  • 1 decade ago

    don't know the 1 , 2 , 3 ,but DDR stands for Double Data Rate there is L Cache 1,2 and 3 located on diff parts of board it is a type of fast ram that is used to speed up memory because it does not to be continuously refreshed .DDR SDRAM is the kind you can add for yourself

  • Anonymous
    5 years ago

    PC 3200 is 400 Mhz and PC2700 is 333. Not much of a difference unless your an overclocker. The PC3200 will usually let you push it much further.

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