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Flash-backed DRAM rides PCIe 3.0 bus

Posted: 06 Aug 2014  Print Version  Bookmark and Share

Keywords:PCIe  DRAM  NAND  flash 

PMC-Sierra beefs up its storage portfolio with a PCI Express 3.0 memory card that features banks of DRAM around the NAND flash controller it bought from IDT in 2013. The flash-backed DRAM having up to 16GB capacity can function as an expansion of either system main memory or block storage.

The card takes a unique, albeit niche, position among today's solid-state memory cards. Most vendors use flash on PCIe as a high-performance replacement for hard drive storage; a few led by Diablo Technologies are plugging flash memory into dual-inline memory module slots.

PMC claims Flashtec cards will offer better performance than flash-based SSDs without their endurance issues. The cards will offer 10 million I/O operations per second when used as additional system memory, the company says.

At least one company has tried the approach. DDRdrive LLC launched a 4GB PCIe card in 2006. Like PMC's product it offered DRAM backed up by flash and a supercapacitor.

The DDR3 and DDR4 buses have slightly lower latency than the PCIe 3.0 bus PMC uses. However the difference is "well below the threshold of any practical application today," for use as an adjunct to main memory, a PMC-Sierra representative said in an email exchange with EE Times.

The DMA engine in PMC's controller helps offload a host processor, as much as quadrupling CPU utilisation in some apps, according PMC. The cards will be available by the end of the year in 4GB, 8GB, and 16GB versions.

The card "fits well into the high-end space," Jim Handy, market watcher at Objective Analysis, tells us. "PMC's Flashtec NVRAM drive is aimed at applications where you can't get enough speed even with maxed-out DRAM and SSDs together. If you add even more DRAM to the system on the PCIe bus you can speed up this kind of system, but it's going to be a top-dollar system."

PMC launched the card at the annual Flash Memory Summit this week. Separately, Diablo will talk at the event about its approach to adding flash to the DIMM slot, an effort for which it lined up support last year from IBM.

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PMC Flashtec NVRAM Drive family achieves 10 million IOPS, claiming to establish a new storage class memory tier for hyperscale datacentres and enterprise storage.

- Rick Merritt
  EE Times





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