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DDR (Double Data Rate) Memory Modules












DDR memory is the newest technology offered by the IT industry in memory and promises to rival the processing speeds of RDRAM or also know as Rambus technology memory. Every manufacturer of motherboards and CPUs have rallied behind the DDR memory movement except for of course, Intel and Rambus.  DDR memory does not promise to wipe out SDRAM memory instantly, so go ahead and buy SDRAM memory while the price is low and it is readily available.   It will take a while before DDR memory takes over as the standard in memory.   First, lets explain just exactly what DDR memory is and let you, the consumer, decide what is right for you.


DDR (Double Data Rate) SDRAM is the newest technology in SDRAM.   DDR memory and SDRAM memory are alike except for the fact that DDR memory reads data on both the rising and falling edges of the system's clock signal.  Since data using SDRAM memory is only read on the rising edge of your system's clock signal, DDR memory can actually double the time in which data is transferred.  If your transfer rate with SDRAM memory was only 133, with DDR memory your transfer rate will be 266 MHz.  DDR memory will also be called DIMMs and will use the same basic technology as SDRAM.  You will not be able to use DDR DIMMs in the place of your SDRAM DIMMs and will need to purchase a motherboard that is compatiable with DDR memory.

The big quetion is: will DDR memory or Rambus memory give me better performance?   Well the answer is not exactly clear and we will try to explain it to you as clearly as possible.  It naturally seems if data transfer rate is faster then that one must be the faster one...unforunately it is not that easy

In Rambus memory the DIMM modules are linked to the bus in a series and data must transfer through one DIMM module before it transfer to the next and finally reaches the bus.  This method can cause increased latency as it requires the data to take a much longer path to the bus.  In most applications where longer streams of data are processed, such as gaming, it will not make that much of a recognizable difference.   However in where shorter streams of data are the norm, such as a server enviroment, it will be recognizable.

In DDR memory each DIMM is connected, individually and in parallel, to the data bus.   So no matter if you have one DDR DIMM or several DDR DIMMs the amount of time it takes the data to reach the bus is virtually unaffected. 

So you may ask yourself, which type of memory will eventually be the standard?    It is really hard to say at this point and we will have to see how the cards play out in this game of memory.

Unfortunately, you cannot interchange the types of memory and will have to purchase a motherboard that supports the type of memory you choose.   DDR memory will not work in a SDRAM slot and Rambus will not work in either as well.   Most often the case is the memory modules will not even fit in each slot and you could damage them if you were to try to force them into the slots.  However, it is still the case that the more memory you have the better.   Memory upgrades are still the most cost effective way to improve the performance of your system.

For prices on memory please click here. If you have any other questions about memory please Contact Usand we will be happy to answer any questions on memory.