DIFFERENCE BETWEEN DDR2 AND DDR3

DDR2 AND DDR3

DDR 2, DDR 3, DDR are new versions of REM memory. In which DDR3 is a more advanced version, it comes with more capabilities such as higher data transfer speed, lower power consumption, memory reset option, more memory. The main difference between DDR 2 and DDR 3 is the data rate, where DDR 3 provides twice as much speed as DDR 2. 


DIFFERENCE BETWEEN DDR2 AND DDR3

With the speed of technology, several versions have been developed to make memory faster, of which DDR is a new version. Several techniques are used to increase the speed of transferring the bit from pin to chip. Effectively clock speed is used which allows the transfer of data externally to the rising and falling edge of the clock, which is why these memories are known as double data rate memory.


In this post, you will learn-


  1. Comparison chart of DDR 2 and DDR 3
  2. Definition of DDR 2 and DDR 3
  3. A significant difference between DDR 2 and DDR 3
  4. Conclusion

1. Comparison chart of DDR 2 and DDR 3



Comparison basis

DDR2

DDR3

Clock frequency

 

400 – 800 Mhz

800 – 1600 Mhz

Transfer data rate

400 – 800 Mbps

800 – 1600 Mbps

The voltage

1.8 volts

1.5 volts

Bit width required

4 bit

8 bit

Memory reset option

There is no provision

It provides

power consumption

more

Less

Speed

Less

more

Delay

2 – 5

7 – 11

Display

Is better than DDR3

Medium

cost

Less 

more 



2. Definition of DDR2 


DDR 2 is the second version of DDR (double data rate) memory. These versions of RAM were developed to achieve a high data rate for block-transferring. It can transfer data at a clock rate of 400 to 1066 MHz. DDR 2 is the successor version of DDR where the main change between the RAM chip and the prefetch buffer is applied to the operational frequency and the amount of both parameters is increased. The prefetch buffer is a 4-bit memory cache that resides in the DDR 2's RAM chip. The buffer is used in the RAM chip.


DDR 2 is a 240 pin DIMM (dual in-line memory module) architecture that operates at 1.8 volts. These are built into one or more RAM chips in a single board of a DIMM motherboard. DDR2 voltage is lowered by its anti-current DDR technology to eliminate heat effects. The DDR operates at 144 pins of DIMM design and a voltage of 2.4 volts. There is no compatibility between DDR 2 and DDR, as both use separate motherboard sockets and DIMM keys.


Definition of  DDR3 


DDR 3 is an advanced version of DDR 2 which has increased the prefetch buffer to 8 bits and the operating frequency has been increased to 1600 Mzz. However, the amount of electricity is reduced to 1.5 volts which also reduces the heating effect of the higher frequency. The pin architecture of DDR 3 also has 240 pins, but they cannot be used in DDR 2's motherboard RAM because they are noted separately.


A unique option is available in DDR 3 which clears the memory through software reset action. The memory reset option ensures that the memory is emptied after rebooting the system.


3. IMPORTANT DIFFERENCE BETWEEN DDR 2 AND DDR 3


  • DDR 2 memory operates at a range of 400 to 800 MHz and generates data rates up to 800 Mbps. In contrast, DDR 3 operates at 800 to 1600 MHz clock frequency and transfers data up to 1600 Mbps speed.
  • DDR 2 consumes more power because 1.8 volts are required to supply it. In contrast, the supply of DDR 3 requires 1.5 volts which is less than DDR 2, and also significantly reduces the heating effect caused by the higher frequency.
  • The prefetch buffer in DDR 2 is 4-bit in size while in DDR 3 it is 8-bit.
  • Memory reset options are available in DDR3 but are not available in DDR2.
  • DDR 3 is relatively faster than DDR 2.
  • DDR 3 is more expensive than DDR 2.

Conclusion


DDR 2 is an earlier version and an older technology, and DDR 3 is a later version of DDR where many improvements have been made to DDR 3 and it offers more features such as storage space, low power consumption, and fast clock. Speed, system flexibility, etc.


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