Tuesday, January 3, 2012


Random Access memory (RAM) is form of computer Data storage. It is known as volatile memory, where information stored is lost if power is removed. Presently two main form of RAM are Static RAM (SRAM) and Dynamic RAM (DRAM). In Static RAM a bit of data is stored using state of flip flop. This type of RAM is expensive to produce , but it is faster and require less power than DRAM. Dynamic RAM stores a bit of data using transistor and capacitance pair, this form of memory is less expensive to produce.

From last some decades we are using DDR, then DDR2 RAM and now we are upgraded to  DDR3 Random access memory. DDR, DDR2 and DDR3 is based on SDRAM (Synchronous Dynamic Random Access Memory ). DDR stands for Double data rate. SDRAM uses clock signal to synchronize the things.

DDR2 and DDR3 is improvement of technology, these two version differentiate on the basis of data transfer per clock cycle . DDR2 provides 4 data transfer per clock cycle and DDR3 provides 8 data transfer per clock cycle. if we assume base clock speed of 100 MHz, the DDR will provid 1600 Mbps bandwidth, DDR2 will provide 3200 Mbps bandwidth and DDR3 will provide 6400 Mbps bandwidth.

DDR3 memory provides a reduction in power consumption of 30% compared to DDR2

The main benefit of DDR3 comes from the higher bandwidth made possible by DDR3's 8 Burst deep prefetch buffer, in contrast to DDR2's 4 Burst or 2 Burst deep prefetch buffer.

Definitely DDR3 providing much higher memory bandwidth, it might increase performance and speed of your system, but if you are thinking to upgrade your RAM to DDR3, then before doing this you must check that you motherboard is compatible with it or not. Because earlier motherboard was designed for DDR2 RAM , which are not compatible to work with DDR3

But now all the new systems(Desktop / laptop) are pre installed DDR3 RAM.

Tags: RAM|DDR3|DDR2|DDR|RAM Specifications|DDR2 and DDR3 Specifications

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