Double Data Rate SDRAM
Double Data Rate SDRAM, or DDR SDRAM, is the second major competing technology that will replace SDRAM in the near future. As its name implies, DDR SDRAM doubles the bandwidth of the system memory by allowing data transfers on the rising and falling edges of a clock cycle. This is very similar to the clock doubling used in the AGP technology. Unlike its closest competitor, Direct Rambus DRAM, DDR SDRAM is available without the burden of licensing fees to the motherboard manufacturers. DDR SDRAM uses a 184-pin module that will require users to upgrade their motherboards.
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