What is the Difference between DDR1, DDR2 and DDR3
DDR or Double Data Rate is a type of computer RAM (Random Access Memory) that is categorized as a fastest memory. No doubt, the architecture of DDR RAM is same as like SDRAM. However, the data transfer rate in case of DDR RAM is much faster as compared to SDRAM. The generations of DDR RAM are like DDR1, DDR2, and DDR3 etc. Usually people remain confuse about the difference among these generations of DDR RAM and here is a solution of their confusion.
DDR1
DDR1 or DDR DIM is the first generation in DDR RAM. DDR1 has 148 pins to fit into the motherboard. DDR1 utilizes the JEDEC standard for Double Date Rate and is also available as registered. Registered DIMMs are generally known as FB-DIMMs. An interesting and largely unknown aspect of un-buffered DDR DIMMs is that they are able to operate one clock cycle faster than FB-DIMMs.
DDR2
DDR2 is the second generation memory. 400MHz is the lowest speed of DDR2, which is highest in case of DDR1. So, where DDR1 ends, DDR2 starts. It sound strange, but DDR1 performs better than DDR2 at 400 MHz, but at next levels, DDR2 is an outstanding performer.
DDR3
The third generation member of DDR memory is the DDR3. Its lowest capacity level is 800Mbps and it goes up to 1600Mbps. The bus speed is quite high as well i.e. 2000MHz. It offers many advantages, like better performance with less power consumption. It can operate at just 1.5 V, while DDR2 operates at 1.8 V. Moreover, this system will remain cold, as it generates very little amount of heat.
DDR1 vs DDR2 vs DDR3
No doubt, these three generations are the types of DDR RAM. However, they differ widely in terms of features. The number of pins and FSB for DDR1, DDR2 and DDR3 are 184, 240, 240 and 333, 666, 1333 respectively. Moreover, DDR1 works for 2.5 volts, DDR2 for 1.8 volts and DDR3 for 1.5 volts.
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