What Types of DDR2 RAM Are There?

DDR2 is the second generation of DDR, or double data rate, and there are several speeds of DDR2. The original version of DDR was introduced to the electronics market in 2000. In 2003, DDR2 was introduced. Before installing DDR2 into your computer, it is important to ensure that the motherboard is compatible with the DDR2. If your motherboard isn't compatible, you can upgrade it so that the DDR2 can be installed.

DDR2-400

The DDR2-400 is the slowest of the DDR2 options. The memory clock of the DDR2-400 is able to store up to 100 megahertz while transferring and processing data. Each cycle of the DDR2-400 is completed in 10 nanoseconds (ns). The DDR2-400 is capable of up to 400 million data transfers per second (MB/s) and the peak performance is 3200 MB/s. While the DDR2-400 is the slowest option of the DDR2 versions, users who are upgrading from DDR1 will notice the increase in processing speed.

The DDR2-533 is capable of 133 megahertz storage in the memory clock. The cycle time of this DDR2-533 type is completed in 7.5 nano seconds. The data transfer rate of the DDR2-533 is increased from the DDR2-400. It can complete up to 533 million data transfers per second. The peak transfer rate of the DDR2-533 is 4266 MB/s.

The middle range option of DDR2 is the DDR2-667. This version of the DDR2 is capable of storing 166 megahertz in the memory clock. Each processing cycle is completed in 6 nano seconds. The number of data transfer is significantly higher compared to the baseline DDR2 option. It can complete up to 667 million data transfers per second, with a peak performance of 5333 MB/s.

The DDR2-800 is the recommended DDR2 option for those who are planning to upgrade DDR2 compatible computers. The memory clock stores 200 megahertz and each processing cycle of the DDR2-800 is completed in 5 nano seconds. The DDR2-800 can complete 800 million data transfers every second. The peak transfer rate of the DDR2-800 is 6400 MB/s

The DDR2 top-of-the-line option is the DDR2-1066. This option is significantly faster than the basic DDR2-400 or the mid-line DDR2-667 option. Every processing cycle is completed within 3.75 nano seconds. It can complete up to 1,066 data transfers every second compared to the 400 million of the basic DDR2 option. The peak performance of the DDR2-1066 is 8533 MB/s.