Samsung GDDR6W: Twice the Bandwidth and Density of GDDR6 (stacking)

Discussion in 'Frontpage news' started by Hilbert Hagedoorn, Nov 29, 2022.

  1. Hilbert Hagedoorn

    Hilbert Hagedoorn Don Vito Corleone Staff Member

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  2. JamesSneed

    JamesSneed Ancient Guru

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    This is going to be a big deal for next generation of GPU's 18 months from now.
     
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  3. Horus-Anhur

    Horus-Anhur Ancient Guru

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    I can't wait for a 7500XT with a 32bit bus :D
     
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  4. Undying

    Undying Ancient Guru

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    No gddr7?
     
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  5. TLD LARS

    TLD LARS Master Guru

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    Have I understood this correctly? This is only packing 2 individual mem chips on top of each other?

    A 3090 could have used the double stack to keep memory on one side.
    The 3090 ti solved that problem with double sized memory modules.
    So more then 24GB memory is needed before stacking makes sense and it still needs to be cheaper then just going back to putting memory on both sides of the PCB again like the 3090.

    AMD and Nvidia already use HBM for the top pro cards, so the stacking would not really be needed here, unless it is a cheaper alternative.

    The GPU would need a wider bus to address the 2 individual memory modules in the stack if double mem speed is required, just like when 2 memory modules was just side by side on a PCB?
    GPU manufactures would mostly cheap out on the mem bus, so cost would prevent this from doubling the mem speed, just like today.

    The only place I can see this really shine would be for small form factor GPU, laptop GPU or SSD cache.
     
  6. schmidtbag

    schmidtbag Ancient Guru

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    SSDs use GDDR?
     
  7. user1

    user1 Ancient Guru

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    it doesnt need to be wider necessarily, they just need to increase the number of data per clock cycle, gddr6 is quad data rate memory so 4 bits per cycle.

    octal data rate memory (8 bits per cycle) has been done before , so its definitely possible.

    the wiki page on gddr6 actually mentions that while the data rate is qdr , the command rate is actually odr, so seems like updating the spec to support odr data rates too would be a natural evolution.
     
  8. TLD LARS

    TLD LARS Master Guru

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    If this is basic stacking of 2 chips on top of eachother, DDR should work fine with stacking too, maybe even stacking of memory on top of the main flash storage.
    A "fairly cheap" PS 5 has a GDDR controller on the CPU so I do not see why a new server grade SSD with gen 5 at 4-16 lanes could not have the same ability. It could be a mmo player data server or youtube login server or something like that.
     
  9. Bo Alenkaer

    Bo Alenkaer Member

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    So those modules is 4GB each with double the bandwidth per chip, would make use of only 6 chips to achive the same 24GB on a 384bit memory bus config. That would require less PCB space and a more simple power supply.
     
    Last edited: Nov 29, 2022
  10. Nopa

    Nopa Member Guru

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    GDDR7 will likely appeared on consumer cards from 2024 onwards.
    2023 will be busily occupied with standard/old GDDR6, new 24Gbps+ GDDR6, GDDR6X, GDDR6 + L3/Infinity Cache, and GDDR6W.
     
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