DDR2

DDR2, the abbreviation for Double Data Rate Two, is a high-speed variant of synchronous dynamic random access memory (SDRAM) that is used in personal computers as well as many other intelligent electronic devices. The DDR memory enables double the data transfer rate as compared to conventional memory chips. DDR2, in turn, increases the bus data transfer speed up to double the capacity of the memory cells intrinsic to it.

An advantage that DDR2 offers is data transfer on both the ’peaks’ and the ’troughs’ of the clock signal. This data transfer speed is initiated without corresponding increase in the frequency of the front side bus (FSB). DDR2-400 offers a peak data transfer rate of 3.2 GB/second, DDR2-533 offers around 4.24 GB/second, DDR2-667 has a speed of 5.336 GB/second, DDR2-800 permits a transfer speed of 6.4 GB/second and DDR2-1066 gives 8.5 GB/second.

Since DDR2 RAM is the memory that is partly responsible for the working of the operating system as well as all the applications that are opened by the user or running in the background, the performance of the computer is heavily dependent on the RAM. Thus, the number of applications that can be opened and run simultaneously depends on the amount of RAM.