AMD: Navi Speculation, Rumours and Discussion [2019]

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

  1. SimBy

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    Take it as you will. I'm guessing it's the 72 CU SKU.

     
  2. yuri

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    Historically, the XT vs XTX diff was just a matter of frequency, right?
    Anyway, 255W is pretty low given the rival's TDP.
     
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  3. Scott_Arm

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    So about a 290-300W card. If it's 72 CU that puts it around 22 TFLOPS (2.4x more than 5700xt with game clocks). Assuming it's still 128 ROPs, around 307 GPixels/s (2.7x more than 5700xt with game clocks). Bandwidth is interesting because with a 256bit bus it's probably only marginally better. That cache is going to have to have to do wonders.

    80CU will be about 24.6 TFLOPS and still 307 GPixels/s.
     
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  4. nAo

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    Does TGP represent the power used by the gfx board?
     
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  5. tEd

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    In Nvidia terms yes. AMD often uses TBP (Total Board power or Typical Board Power)
     
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  6. SimBy

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    Beats me. If it's actually a full 80CU SKU you're looking at almost 25TF peak. That's 3x+ 5700 non X.
     
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  7. PSman1700

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    Some serious power at over 22TF's atleast.
     
  8. nAo

    nAo Nutella Nutellae
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    If a 5700XT with 40 CUs and 1.755 GHz game clock has a TDP of 225W (https://www.techpowerup.com/gpu-specs/radeon-rx-5700-xt.c3339), a 72 CUs part with 50% perf/W improvement (at game clock?) would have a 270W TDP. But we’re talking a ~35% higher game clock here.. so perhaps the 255W figure is about the main chip only?
     
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  9. SimBy

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    I'm dying to hear how exactly they solved memory bandwidth issue. I hope we actually get some details on the 28th.
     
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  10. xEx

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    The leak said TGP. So it would be 180W TDP chip.
     
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  11. nAo

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    180W for Navi 10? If you start there you get 215W for the chip alone, without considering the much higher clock (if true) and everything else on the board. I am not say it’s impossible but perhaps the numbers we got so far are a bit off..

    OTOH if 255W is for Navi21 ‘only’ then it start making more sense.
     
    #3751 nAo, Oct 18, 2020
    Last edited: Oct 18, 2020
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  12. SimBy

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    #3752 SimBy, Oct 18, 2020
    Last edited: Oct 18, 2020
  13. Scott_Arm

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    So assuming AMD showed a 72CU benchmark at their presentation, and there's an 80CU unit that'll come out we can extrapolate the following:

    borderlands 3 4k badass 61 -> ~68 fps
    Modern Warfare 4k ultra 88 -> ~99 fps (this game doesn't have a benchmark, so I have no idea how they got this number)
    Gears 5 4k ultra 73 -> ~82 fps

    Seems to line up with the 3090. The original numbers seem to line up with the 3080. As long as they aren't memory starved, they may have a big advantage at 1080p and 1440p, which is honestly where most people will be playing anyway. PC gaming is primarily 1080p high refresh displays with some 1440p high refresh displays. 4k120 monitors may start to become popular but they're expensive.
     
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  14. Rootax

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    Assuming perfect scaling ?
     
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  15. marifire

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    Only 10 days to go...IMO, biggest navi 21 could be AMD only design at least for launch aka RX 6900 XT 80cu 2500Mhz with showed 3 fan design, RX 6900 72cu and RX 6800 64cu or whatever navi 21 at 2200-2400Mhz beeing AIBs. We don´t know if AMD showed perf numbers are from 80 or less cu part. But yes, all points to RX 6000 performance to be better at 1080/1440p than 4K, so if the highest one is close RTX 3090 perf at 4K, its probably better at less res. And navi 22 RX 6700 series could launch a bit latter with 40cu and dual fan design and/or AIBs.
     
  16. Scott_Arm

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    yes, very naive to think everything will scale perfectly, but it’s probably roughly in the ballpark of.

    edit: assuming the sample benchmarks weren’t the 80cu part.
     
  17. Scott_Arm

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    The numbers they showed could be the top 80 cu part or they could be a 72 cu part. Don’t know yet. We also don’t know how it’ll scale to lower resolutions because we don’t know how bandwidth affects the gpu. Is there also a possibility the 72cu part has cut down rops?
     
  18. Scott_Arm

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    5700xt gets about 40 fps in gears 5 at 4K ultra. The number they released was 73 fps. Even if that’s the 72cu part that’s not showing the 2.4x tflops improvement (at game clocks). It’s about 1.8x. Means scaling is limited elsewhere. Bandwidth is an obvious candidate.

    borderlands 3 might be scaling a little better. Haven’t found a badass settings benchmark but ultra is 31fps. So about 2x scaling at a minimum.
     
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  19. marifire

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    Don´t think highest one will exceed 300W TDP, so in case they have more than 2x 5700 XT 225W perf at 4K, perf/w increase is more than 50%, but 5700 XT is the least efficient Navi 10 anyway. RTX 3080 is just 2x 5700 XT at 4K.
    Even if they only reach showed results with the biggest 6900 XT one at 4K, 5% behind 3080 and 17% behind 3090 with 300W TDP, then promised 50% perf/clock just matches, and thats by itselft pretty impresive and could be faster and more efficient than 3080 at lower res and overall. Lets see if they have some other rabbit and was not highest one showed...

    Supposed 72cu part should not cut on ROPs nor bandwidth, we still don´t know it its 128 ROPs anyway. and if this is some kind of smart cache compensating for "low" bandwidth 512Gb/s, as i see it worst case scenario for them would be 4K and higher res.
     
  20. marifire

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    Guess scale will depend also on each game basis. One thing is clear IMO, AMD did not show best case scenario for RX 6000. RTX 3080 doesn´t double RX 5700 XT at gears5 4K either, and 4K was the worst case scenario for 5700 too...
     
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