A Guide to Purchasing DDR memory
The DDR SDRAM or double-data-rate synchronous dynamic random access memory, presents greater bandwidth in comparison to any other ordinary SDRAM. It is a kind of memory integrated circuit which is used in computers that transfer data on both the rising and falling edges of the clock signal. The DDR ram is highly efficient and almost doubles the transfer rate, whilst maintaining the frequency of the front side bus.
To illustrate, if the data is transferred at 8 bytes at a time, the DDR RAM transfer rate would be calculated as (memory bus clock rate) × 2 (for dual rate) × 8 (number of bytes transferred). This implies having a bus frequency of 100MHz, DDR SDRAM gives a maximum transfer rate of about 1600 MB/s. DDR memory has about 184 pins and one notch and it operates at a voltage of 2.5V.
The DDR SDRAM package sizes and also the standards of speed have been determined by Joint Electron Device Engineering Council (JEDEC). Basically, there are two sets of specifications including one for memory chips and the other for memory modules. When a person runs DDR SDRAM at lower speeds than the specified, it is known as under clocking and if it is running at higher speeds than it is known as over clocking.
To double or even quadruple the actual bandwidth, some latest chipsets utilize such memory kinds in dual or even quad channel configurations. The new generation DDR 2 has some changes, and allows higher clock frequency.
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- DDR2 667: Moderate SDRAM Memory Module DDR2 667 i
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