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184 Pin RIMM
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RIMM is the trademarked name for a Direct Rambus memory module. RIMMs look similar to DIMMs, but have a different pin count. RIMMs transfer data in 16-bit chunks. The faster access and transfer speed generates more heat. An aluminum sheath, called a heat spreader, covers the module to protect the chips from overheating. Direct Rambus is a new DRAM architecture and interface
standard that challenges traditional main memory designs. Direct Rambus
technology is extraordinarily fast compared to older memory technologies.
It transfers data at speeds up to 800MHz over a narrow 16-bit bus called
a Direct Rambus Channel. This high-speed clock rate is possible due
to a feature called "double clocked," which allows operations to occur
on both the rising and falling edges of the clock cycle. Also, each
memory device on an RDRAM module provides up to 1.6 gigabytes per second
of bandwidth - twice the bandwidth available with current 100MHz SDRAM. Before it even became a contender for main memory, Rambus technology was actually used in video memory. The current Rambus main memory technology is called Direct Rambus. Two earlier forms of Rambus are Base Rambus and Concurrent Rambus. These forms of Rambus have been used in specialty video applications in some workstations and video game systems like Nintendo 64 for several years. |
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