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HyperCloud Memory
HyperCloud Memory (HCDIMM) is a DDR3 SDRAM Dual In-Line Memory Module (DIMM) used in server applications requiring a great deal of memory. It was initially launched in 2009 at the International Supercomputing Conference by Irvine, California based company, Netlist Inc..
==Technical==
HCDIMM is a 240-pin, 72bit-wide, Load Reduced, DDR3 SDRAM Dual In-Line Memory Module (DIMM). According to Cirrascale, "while LRDIMM requires a special BIOS configuration, HyperCloud provides seamless plug-and-play operation with past, current and future generations of Intel processors."〔Cirrascale. "(HyperCloud Acheieves Server Memory Speed Breakthrough SC11 )." November 15, 2011〕
The logic function embedded into the register device and the isolation devices used on the HCDIMM performs rank multiplication and load reduction functions which allows the system to increase its performance and access high capacity memory modules. The register device “re-drives the command, address and clock signals” from the host memory controller to the DRAM chips and presents four physical ranks of memory as two virtual ranks to the memory controller on the processor.〔(【引用サイトリンク】 title=HCDIMM Outperforms LRDIMM in Big Data and Big Memory, CMTL )〕
Rank multiplication allows maximum memory densities on each server memory channel while the isolation device makes four DRAM appear as one to the memory controller. This reduces the electrical load all while allowing high density DIMMs to run at high speeds.〔(【引用サイトリンク】 title=Netlist puffs HyperCloud DDR3 memory to 32GB )〕 HCDIMM has a lower bit-to-bit data skew and latency due to its distributed architecture by having multiple isolation devices between the DRAM and data bus.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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