February 28, 2008

Theory of RAM

Hello friends I am back with some new interesting topics to share with you that are most confusable. Here, I am going you to discuss one of the major part of our computer system that is SDRAM (Synchronous Dynamic Random Access Memory) commonly referred as RAM. The first version of RAM that came into existence is SDR (Single Data Rate) RAM , these types of RAM are of SDR in nature that means here SDR RAM reads data only on the rising edge of the clock signal that implies half of the clock signal is wasted. These types of RAM are used before 2002. In 2002 a new type of RAM hits the main stream computer market named as DDR(Double Data Rate) RAM. The DDR RAM is the extended version of SDR RAM as from its name it is clears that it reads the data with twice speed in comparison to SDR RAM. It reads the data from both the trailing edge and rising edge of the clock pulse.

The main drawback of DDR RAM is that it had a limited clock rate, hence some changes are required in its architecture this gave the birth to a extended version of DDR RAM which is commonly known as DDR2 RAM. With DDR2 RAM we can achieve speed that is beyond of DDR RAM. It delivers a bandwidth of about 5.3GB/second and above it because it is able to operate with faster bus speeds. As all we know all motherboards can support only one type of RAM, that means you cannot mix and match SDRAM, DDR, or DDR2 memory on the same motherboard in any system. They will not function and will not even fit in the same sockets.

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