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HOTI
2008
IEEE

OCDIMM: Scaling the DRAM Memory Wall Using WDM Based Optical Interconnects

13 years 10 months ago
OCDIMM: Scaling the DRAM Memory Wall Using WDM Based Optical Interconnects
—We present OCDIMM (Optically Connected DIMM), a CPU-DRAM interface that takes advantage of multiwavelength optical interconnects. We show that OCDIMM has at least three key benefits when compared to alternatives such as FBDIMM (Fully Buffered DIMM), which is used in recent products from Sun [1] and Intel. First, replacing the multi-hop store-and-forward network in the FBDIMM architecture by a WDM (wavelength-division multiplexing) based optical interconnect results in significantly lower latency (up to 50% reduction in some configurations). Second, it is scalable to much higher capacities (such as 32 DIMMs per channel) with only a modest degradation in latency. Third, due to the higher data rate of an optical interface and the concurrency offered by multiple wavelengths, OCDIMM offers up to a 90% improvement in memory bandwidth. Most importantly, these benefits can be obtained using off-the-shelf DRAM devices, by making simple modifications to the DIMM circuit board and the mem...
Amit Hadke, Tony Benavides, S. J. Ben Yoo, Rajeeva
Added 29 May 2010
Updated 29 May 2010
Type Conference
Year 2008
Where HOTI
Authors Amit Hadke, Tony Benavides, S. J. Ben Yoo, Rajeevan Amirtharajah, Venkatesh Akella
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