AMD: Navi Speculation, Rumours and Discussion [2019]

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

  1. no-X

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    They were not. For Vega it was "at the same frequency", but for Navi it's for a particulars product, so not at the same frequency, but for a product "as is".
     
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  2. del42sa

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    Actually Vega 20 has the same perf./watt. as NAVI + NAVI RDNA should add 1,25x performance per clock over older GCN products. However we don´t know how these changes affect max. frequency = Navi might clock lower than Vega, etc. IPC gain is not cost free....
     
  3. snc

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  4. del42sa

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    No, you just confuse "performance" with "perf./watt." metric.
     
  5. snc

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    So explain me whats the difference beetwen performance at the same power vs per/w :D
     
  6. DavidGraham

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    They did so in Vulkan as to show a situation where they are largely ahead. They never showed a game where they had lower performance in any API, despite claiming to win some and lose some versus Turing, so they DID cherrypick their best results in all APIs.

    NVIDIA never released a driver where they publicly stated it improves Strange Brigade performance in any meaningful capacity.
    That one recently recieved a driver update from NVIDIA with official notes stating it increased performance by 18% in Vulkan.
    I don't know, maybe because this one game favors both?

    That IS a speculation.
     
  7. itsmydamnation

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    So your answer is you dont know for NAVI? correct?
     
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  8. Bondrewd

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    No one does, that's the point.
     
  9. del42sa

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    yes, you´re right , I did a wrong math. This slide with 50% lower power with Vega 20 confused me... sorry for that. Navi perf/watt is indeed better than Vega20.
     
  10. function

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  11. snc

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    Your welcome ;)
     
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  12. del42sa

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    so my assumption is if they got 1,25 perf/watt gain over Vega 20 and RDNA offer 1,25 x performance/clock, then NAVI should clock wise end at the same frequency as Radeon VII, right ?
     
  13. itsmydamnation

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    Depends if this was a full or a cutdown SKU, the funny thing is we will know all this in like 10 days.

    Also you can see the FPS on the demo (top left) the 2070 appears to match this 2070, which was uploaded like a day ago :




    NAVI demo
     
  14. ToTTenTranz

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    #614 ToTTenTranz, May 30, 2019
    Last edited: May 30, 2019
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  15. BRiT

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    Car Analogy:
    Old Engine could finish the race at 100 Kilometers per hour using 10 Litres of fuel.
    New Engine can finish the race at 125 Kilometers per hour using 6.6 Litres of fuel.

    One is about performance, the other is about efficiency.
     
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  16. Nebuchadnezzar

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    We have some better pictures of Matisse/Navi alongside a ruler - I still stand by my measurement of around 275mm².
     
  17. ToTTenTranz

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    Oh since you apparently didn't publish those, I thought you had used random press photos and image editing.
    Which is why I was also confused by the claimed 5% margin of error, to be honest.
     
  18. anexanhume

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    I agree about the negative area on Vega 20. I wonder if it is at all related to needing a 7nm pipe cleaner (i.e. quick turn design) or if it’s a simple function of power and heat density. Perhaps they couldn’t go smaller because they needed the pins to move current and avoid excessive IR losses.
     
  19. snc

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    There is no slide that telling 1.5 X perf/watt at same frequency. There is navi slide that claims 1.25 X perf per clock and also 1.5 X perf/watt. Slides for amd vii claims 1.25x per at the same power which is the same as 1.25x per/w ( The watt (symbol: W) is a unit of power - wikipedia)
     
  20. anexanhume

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    It’s self consistent. Radeon 7 has 1.25 perf/Watt, Navi has 1.25x perf clock. Multiplying the 2 gives you ~1.5X. Actually a small regression which may be rounding error or power penalty of GDDR6 vs. HBM2.
     
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