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posted by on Monday April 03 2017, @12:28AM   Printer-friendly
from the hamster-wheel-never-stops dept.

JEDEC has announced that it expects to finalize the DDR5 standard by next year. It says that DDR5 will double bandwidth and density, and increase power efficiency, presumably by lowering the operating voltages again (perhaps to 1.1 V). Availability of DDR5 modules is expected by 2020:

You may have just upgraded your computer to use DDR4 recently or you may still be using DDR3, but in either case, nothing stays new forever. JEDEC, the organization in charge of defining new standards for computer memory, says that it will be demoing the next-generation DDR5 standard in June of this year and finalizing the standard sometime in 2018. DDR5 promises double the memory bandwidth and density of DDR4, and JEDEC says it will also be more power-efficient, though the organization didn't release any specific numbers or targets.

The DDR4 SDRAM specification was finalized in 2012, and DDR3 in 2007, so DDR5's arrival is to be expected (cue the Soylentils still using DDR2). One way to double the memory bandwidth of DDR5 is to double the DRAM prefetch to 16n, matching GDDR5X.

Graphics cards are beginning to ship with GDDR5X. Some graphics cards and Knights Landing Xeon Phi chips include High Bandwidth Memory (HBM). A third generation of HBM will offer increased memory bandwidth, density, and more than 8 dies in a stack. Samsung has also talked about a cheaper version of HBM for consumers with a lower total bandwidth. SPARC64 XIfx chips include Hybrid Memory Cube. GDDR6 SDRAM could raise per-pin bandwidth to 14 Gbps, from the 10-14 Gbps of GDDR5X, while lowering power consumption.


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  • (Score: 2) by Scruffy Beard 2 on Monday April 03 2017, @04:30AM (2 children)

    by Scruffy Beard 2 (6030) on Monday April 03 2017, @04:30AM (#488104)

    I think "density" when it comes to memory modules refers to how much capacity is allowed in each module.

    DDR - 1GB
    DDR2 - 2GB
    --- not sure of the limits of the newer ones.

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  • (Score: 2) by takyon on Monday April 03 2017, @05:07AM

    by takyon (881) <takyonNO@SPAMsoylentnews.org> on Monday April 03 2017, @05:07AM (#488117) Journal

    Seems to be 16 GB for DDR3 [wikipedia.org] and 64 GB for DDR4 [wikipedia.org]... but I think manufacturers have exceeded those limits for both DDR3 and DDR4 [thememoryguy.com]. I guess you could call that non-JEDEC standard.

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  • (Score: 2) by shortscreen on Monday April 03 2017, @05:15AM

    by shortscreen (2252) on Monday April 03 2017, @05:15AM (#488119) Journal

    in other words, the number of address lines present in the DIMM slot