SMART Modular this month demonstrated one of the industry’s first prototypes of a EDSFF 3-inch DDR4 Gen-Z memory module. The ZMM supports advanced functionality enabled by the new interface and offers throughput akin to that offered by today’s DDR4-4000 memory modules.

SMART Modular’s 256 GB ZMM uses Samsung’s 32 Gb 4-high DDR4 DRAM devices as well as IntelliProp’s Gen-Z Mamba memory controller ASSP, which supports multiple access semantics, including byte and block addressable DRAM access, in-band configuration, and access key/region key memory isolation opcodes in a bid to simplify memory access needed to handle emerging data-centric workloads. The controller features 16 Gen-Z lanes with 25 Gbps PHY as well as 400 Gbps aggregate performance. The chip requires up to 20 W of power, so it needs proper cooling.

The Gen-Z module from SMART Module comes in SNIA’s 3-inch 4C SFF-TA-1008/9 form-factor, and offers a 30 GB/s bandwidth along with 400 ns deterministic access latency.

The 256 GB ZMM was demonstrated in rack servers designed by Dell and Hewlett Packard Enterprise specifically to test Gen-Z interconnection.

The showcase of a 256 GB Gen-Z ZMM by a well-known supplier of memory and storage solutions with two makers of servers indicates that the industry is getting ready for a roll-out of Gen-Z products in the future. What remains to be seen is when exactly SMART Modular and its partners will be ready with commercial Gen-Z modules and platforms.

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Source: SMART Modular



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  • boeush - Thursday, August 15, 2019 - link

    Bandwidth-wise: the way I read it:
    - the _controller_ supports up to 400 Gbps total bandwidth
    - the _specific configuration_ for this particular device (using that controller) offers 30 GB/s

    In other words, the controller is capable of more performance, in theory - but isn't being maxed out in this specific design.
  • QChronoD - Friday, August 16, 2019 - link

    30GB/s = 320Gbps, 80% of the 400Gbps of the controller. Reply
  • Vatharian - Saturday, August 17, 2019 - link

    30GB/s = 240 Gb/s, or you know something I don't. Reply
  • ats - Thursday, August 15, 2019 - link

    Because it is in effect being accessed across a ethernet interface. And once you add in the required switches, it will easily be over 1000ns, fyi. Reply
  • name99 - Friday, August 16, 2019 - link

    So this is basically competition for Optane DIMMs? Same sort of space?
    If so, how does it compare?
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