AMD: Navi Speculation, Rumours and Discussion [2019]

Discussion in 'Architecture and Products' started by Kaotik, Jan 2, 2019.

  1. del42sa

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    I have seen NAVI board with 2 x 8-pin PCIe power connectors and I heard from Sapphire repr., that there is watter cooled NAVI board, which speaks itself .-)
     
  2. Jay

    Jay
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    What does the water cooling say to you?
    As I've seen water-cooled sku's for years now. So it only says to me they'll also have a water cooled version so it can be pushed further.
     
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  3. Bondrewd

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    I've seen the TU102 board with 3*8pin.
    I'm pretty sure there's watercooled 1070s.
    It's a question of product being >$400 MSRP over anything else.
     
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  4. Kaotik

    Kaotik Drunk Member
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    And I have seen TU102 board with 3 x 8-pin PCIe power connectors ;)
    Last Toxic-series models I know of having watercooling were with 135 and 210 W TDPs, that doesn't actually speak anything for itself.
     
  5. del42sa

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    yes, TU102 and NAVI are very comparable performance wise . LoL
     
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  6. Kaotik

    Kaotik Drunk Member
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    You missed the point (I'm pretty sure @Bondrewd had same point as me) - TU102 ES was 3x8, that doesn't mean retail needs it. Just like Navi ES was 2x8 doesn't mean retail needs it
     
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  7. del42sa

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    yes. Vega 10 clocked below 1200MHz can be efficient too ...
     
  8. Bondrewd

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    That's some exceptional goalpost moving, but that doesn't change TU102 ES being a 525W housefire.
    :^)
     
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  9. Ike Turner

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    Stop feeding the troll...
     
  10. ToTTenTranz

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  11. Metal_Spirit

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    Wait... is he saying Navi will have maximum 5 CU per SE? Or is he talking about the specific case of the 40 CU navi announced for PC?

    I´m hearing all kind of things, from navi beeing able to reach 128 CUs keeping each SE with 16 CUs, to Navi having cutted in Half the number of CUs per SE. This last one would mean the bellow scheme:

    [​IMG]

    Wich one is it? I´m inclined to the last one, keeping maximum CUs at 64.
     
    #411 Metal_Spirit, May 22, 2019
    Last edited: May 22, 2019
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  12. TheAlSpark

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    Probably just the particular SKU. It sounds like it'd be a 4x Kaio Ken Pitcairn.

    I'm not sure what to make of the 32 wavefront per CU compared to current GCN. Currently, we're at 10 wavefronts per SIMD (40 per CU) unless the terminology is garbled.
    https://forum.beyond3d.com/threads/gcn-and-mixed-wavefronts.59610/
     
    #412 TheAlSpark, May 22, 2019
    Last edited: May 22, 2019
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  13. Alexko

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    Is it safe to deduce that the next generation will be akin to Pitcairn in Super-Saiyan mode?
     
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  14. Kaotik

    Kaotik Drunk Member
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    Nope, they've had watercooled Toxic-cards before, X1900 XTX and HD 2900 XT
     
  15. Metal_Spirit

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    On current GCN a wavefront is a total of 64 threads.
    Each SIMD can hold up to 10 Wavefronts... That's 640 threads per SIMD, and with 16 CU you get 40 per CU. A 64 CU GPU would get a total of 2560 Threads

    Now... with a wavefront of 32 that must be diferent! Although I doubt final values are diferent.
    So if I reverse calculations, for a 64 CU Navi I would get the same 40 per CU, Diference would be that the SIMD would get 20 wavefronts.

    Not shure this is correct, or even possible, but I doubt total capacity has been reduced.
     
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  16. ToTTenTranz

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    I just looked up those GPUs and they make absolutely no sense, lol.
     
  17. TheAlSpark

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    :p

    Anyhoo, previously on GCN...
    So Polaris 10 moved to 3 CUs sharing the K$ & I$ for wiring purposes. Wonder if they're taking another step with just paired CUs while also moving to the (apparent) super-SIMD :?:

    GCN CU = SIMD0-3, 4x16ALU, up to 4 CUs sharing K$, I$
    NG CU = SIMD0-1, 2x32, up to 2 CUs sharing K$, I$

    <insert cascade of implications based on the 2017 optimization doc because caches> :oops:

    Could be way off, chasing ghosts etc. :p
     
    #417 TheAlSpark, May 22, 2019
    Last edited: May 22, 2019
  18. del42sa

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    Personally , I don´t believe much in that change with NAVI as it seems far too radical to me. More likely Navi would be another boring GCN stuff pushed again to it´s limits to be at least competitive.
    I believe, radical changes may come with new architecture....
     
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  19. Bondrewd

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    That's Navi.
     
  20. del42sa

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    if you say so....
     
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