CertiGuide to A+ (Core Hardware)  9  Chapter 0011:  System Memory       9  VI  Other Types of Memory

Burst Extended Data Out DRAM 1 Double Data Rate SDRAM

At revolutionary idea in system memory design, Direct Rambus DRAM, or DRDRAM, is the competing technologies to replace the SDRAM. This technology developed by Rambus Inc. in partnership with Intel, had received a lot of attention in the industry because of Intel's plans to use this technology in its future chipsets.

DRDRAM uses a high-speed 16-bit bus running at a clock rate of 400MHz, called a Direct Rambus Channel. Although the data bus of DRDRAM is significantly smaller than conventional SDRAM, its high-speed access and its ability to read or write data on the rising and falling edges of the clock cycle give it a theoretical bandwidth of 1.6GB per second. Future implementations of DRDRAM may even reach clock speeds of over 600 MHz. The packaging for DRDRAM uses is called a Rambus In-Line Memory Module, or

RIMM. It uses a 184-pin connector, and looks very similar to a standard 168-pin DIMM used by SDRAM technologies.

However, the partnership has apparently not learned a lesson from the MCA fiasco, and is planning to charge licensing fees to motherboard manufacturers who wish to use DRDRAM technology. It is likely that DRDRAM will fail to become dominant in the marketplace and may be replaced by other technologies, such as DDR SDRAM.

Figure 47: 184-pin RIMM.

Burst Extended Data Out DRAM 1 Double Data Rate SDRAM

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