What is DDR2, DDR3 & DDR4 RAM?


DDR2 stands for Double Data Rate 2. It is the second generation SDRAM that was released in 2003.It Cyclic time is 10-3.75 MHz and has a voltage of 1.8V.

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DDR2 has a well-improved design than DDR memory that makes DDR2 RAM run faster than DDR and provided more bandwidth that helps to passed more data through RAM chip at a single time.


DDR3 stands for Double Data Rate 3It is a type of SDRAM that is used for system memory. DDR3 modules can transfer data at a rate of 800-2133 MT/S. 

As compared to DDR2, DDR3 uses less power. DDR3 has a maximum of 16 GB memory. It is the third generation SDRAM that was released in 2007.

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 For a laptop, DDR3 RAM stick has 204 pins and for a desktop, it has 240 pins. Power consumption of SDRAM Chips depends on speed, voltage, etc.


DDR4 stands for Double Data Rate 4. It is the latest version of DRAM until DDR5 is published in 2020

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As compared to DDR3, DDR4 uses less power. It physical interface is totally different from the earlier type of random-access memory (RAM). It chips use a 1.2 V supply with a 2.5 V of the auxiliary supply in it.

It has no maximum limit of memory and has slightly more latency than DDR3. It is the fourth generation SDRAM that was released in 2014.

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