AMD: RDNA 3 Speculation, Rumours and Discussion

Discussion in 'Architecture and Products' started by Jawed, Oct 28, 2020.

  1. Bondrewd

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    Yeah but GPUs are super-easy to yield relative to CPUs so that's OK.
    Don't worry they have nuclear solutions for both of those.
    Dice have been cast, and let the best IHV house win!
    Mobile first parts (enumerated Navix3/Navix4 like N23/24) can go there but not much else.
    N33 isn't Samsung despite IP living and kicking on SS nodes so that's it for now.
    Eh, meems.
    SS like to throw BS around, let's see how it actually goes.
    Cuz 7LPE died, 7LPP sucked ass and 5LPE is only marginally less suck and ass over 7LPP; barely a parity with N7(p).
     
    #141 Bondrewd, Feb 10, 2021
    Last edited: Feb 10, 2021
  2. Megadrive1988

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    Agreed.
     
  3. Frenetic Pony

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    Seems like Samsung's 5nm is rooooughly(?) nigh on par with TSMC 7nm. And Samsung's 3nm numbers look quite good in comparison to Samsung's 5nm, so... it'd be like switching from TSMC's 5nm to the same thing but with better supply maybe? Considering Intel might(?) be trying for a good amount of business with TSMC, and Apple can just afford to buy whatever, all of Taiwan probably, going for a better supply route seems reasonable. Especially as TSMC's finfet 3nm isn't even worth the initial engineering cost for a lot of things (you need to switch to GAAFET anyway so why are you doing it?).
     
    #143 Frenetic Pony, Feb 10, 2021
    Last edited: Feb 10, 2021
  4. Kaotik

    Kaotik Drunk Member
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    Hm? At least according to wikichip Samsungs 7nm is supposed to be pretty similar to TSMCs 7nm, granted I'm not sure if the TSMC numbers are for N7, N7P or N7+, but still.
    https://en.wikichip.org/wiki/7_nm_lithography_process
     
  5. Bondrewd

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    Yeah with lower yield and 2 years later.
    On paper yeah but it's a new device which means PAIN for everyone involved, especially for the entire EDA ecosystem.
    Stuff can and will go wrong!
    Depends.
    AMD is very much considering outsourcing/dual-sourcing some parts from SS now a-la Polaris30 back 2 years ago.
    TSMC is projecting 3nm as the Next Big Node for them so idk.
    BS, we have real silicon available and 7LPP missed N7 by 20% on power iso freq.
    7LPP wasn't even better than 8LPP on power, and that was a 10nm foundry class nodelet.
    N7+ died along the way so that leaves N7p now which very much ties 5LPE.
     
  6. Dangerman

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    I think the RDNA 3 SKU that is rumored to be 2.5x the performance of the 6900XT perhaps consists of two 80CU chiplets at 255-300mm2 with a HBM I/O Die. May keep it all under 400 watts overall and be sold perhaps as a '7900XTX'? Basically 7900 series is the double chiplets w/ HBM & 7800 is w/ cheaper GDDR memory. However I'm not sure if GDDR7 and HBM3 will be avaliable, reminder that GDDR5 came shortly after DDR3 and DDR5 which GDDR7 is almost certainly be based upon seems to be at a mature stage since DDR5 8400 kits are being launched this year and GDDR6X is well... power hungry.
     
  7. trinibwoy

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    Maybe higher yields with smaller chiplets will allow them to dial back the clocks. Slow and wide should be more power efficient.
     
  8. manux

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    I bet it's for frontier, not for gamers. Chiplet makes more sense in hpc/ai loads than in gaming loads. Of course once the design exists there is nothing preventing selling some of the units in consumer form faction as well. Could be nice thing for people who use gpu's for work.

    https://www.ornl.gov/news/us-depart...er-record-setting-frontier-supercomputer-ornl
     
  9. Bondrewd

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    Oh no, no.
    Their things are made for fast.
    It's explicitly for hard G gaming (anything RDNA is, once and forever).
    It makes sense everywhere because the shrinks are just outright dying, with real world logic scaling being shite even for dense phone SoCs.
    And talking about SRAM/analog scaling is basically doing warcrimes.
    Those people use nVidia.
     
  10. DegustatoR

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    It makes sense from a production point of view but this isn't what's limiting mGPU in gaming.
    The scaling of a typical graphics workload on a mGPU design - which is what a chiplet design is really - isn't at all a solved problem.
    And because of this it's not a clear cut just yet that "shrinks are just outright dying" simply because it is hard to tell how big of a logic overhead you will need to have in your chiplet GPU design to be even with a traditional single chip solution.
     
  11. Bondrewd

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    This isn't an mGPU.
    NO.
    Ffs you haven't even seen just how S H I N Y HBX is.
    Please stop talking shit because your dog canned their client chiplet designs.
     
  12. manux

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    Do you want to bet? I bet chiplet is designed for frontier and could trickle down from there to pro/consumer like cards? Looser stops posting speculations and will in future back up all claims with good links to reliable sources. Leaks are not reliable source. Either way this bet goes it would improve forum by having less noise and more signal.
     
  13. Bondrewd

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    Why.
    Dawg CDNA parts have no relation to client graphics anymore; they're not even under David Wang.
    The actual adv pkg R&D isn't even under either of those.
     
  14. DegustatoR

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    For all intents and purposes when viewed from a graphics side it is. It doesn't matter much who does the balancing, the issues are still there.

    Okay. How's that RDNA2 beating Ampere in perf/watt and just perf going for you btw?

    Right back at you.
     
  15. Bondrewd

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    It's not; GCD is no independent tile.
    The thing's built off the same brain-juice as Genoa.
    AMD loves their IP uniform and reusable.
    Pretty fucking well actually.
    Mobile massacre incoming (too bad about N7 supply).
    I almost sharted myself looking at mobile Ampere numbers especially for mQ parts.
    Funniest thing of January.
    lol.
    Happy 500mm^2+ on N5 day to you too, fella.
     
  16. manux

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    To create accountability on what you/I claim. If you happen to be wrong the forum would have a lot less noise. And if I happen to loose, it's same effect. Based on your posts you should be 100% sure of winning so isn't this bet an instant win for you? Or are you perhaps not as sure of this as you claim? I also like game of chicken, so there is that.
     
  17. BRiT

    BRiT (>• •)>⌐■-■ (⌐■-■)
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    Can everyone take a deep breathe and relax some before their next post?
     
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  18. Bondrewd

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    Nothing like that exists on the internet.
    Yeah but that's boring.
     
  19. DegustatoR

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    Again, it doesn't matter much who does the balancing, the scheme is the same, the issues are the same. You will loose efficiency on a chiplet design, this is inevitable. The question is - how much silicon will you have to burn to get over that loss? And how much power will you loose to that.

    As in not at all?

    Oh, so it's still incoming.

    We'll see how it will go obviously. I'm just saying that you're singing praises to something absent again while the previous part didn't exactly turned out the way you were saying it will.
     
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  20. Bondrewd

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    Yeah but question is how much.
    Plus that shit is baked into their PPA targets anyway; why do you even mention that at this point?
    HBX is cheap (as are other solutions involving fancy packaging like AIB/AIB 2.0 or that TSMC thing).
    The sorta-expensive and kinda wonky part is the actual packaging routine.
    Very much so, even the housefire SKUs top the perf/W charts.
    Yeah, even Milan GA was pushed down a Q.
    It'll work very very nice.
    But first, RDNA Exynos.
    Oh but they mostly did.
    Sorry on missing on 60SM@256b mobile part, that's a binned N21.
     
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