Current Generation Hardware Speculation with a Technical Spin [post launch 2021] [XBSX, PS5]

Discussion in 'Console Technology' started by pjbliverpool, Feb 9, 2021.

  1. snc

    snc
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  2. mr magoo

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    For comparison i did quick test on my xsx and control with RT during the gameplay draws around 140W ( very early in the game first 10 min, just bought the game).
    With photomode powerdraw jumps to 170-180W (again early in the game). Gears5 hivebuster DLC around 190W (180-190W), ori2 160W+
     
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  3. Globalisateur

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    As you said they need to account the VR headset and it probably depends of the PSU efficieny. In recent consoles Sony have historically used quite low efficiency PSUs.
    I don't think it's a meaningfull number as it's the first time I hear about it. Could it be due to some sudden increase of power consumption misread by your device?
     
  4. senis_kenis

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    Maybe some error margin on device, but in this game only I see such power spike.
     
  5. ToTTenTranz

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    Lower efficiency would affect how much more power the PSU needs to take at the wall for the same DC output, not how much less DC output it can provide compared to its rated values.
    E.g. a (super) low 60% efficiency 300W PSU would need to pull 300/0.6 = 500W at the wall, but it should still be able to provide 300W nonetheless.
    The PS5's PSU has a rated max output of 350W (or 340W on the discless version). Take away 30W for a headset (which is still a ridiculously high power for a VR headset nonetheless) and the PSU should still be able to provide 310W for rest of the console. At the moment it's providing just ~180W max, so there's a lot of headroom left.

    However, this is still the first PS5 model so it's probable that both the PSU and cooling systems were over-engineered while Sony wasn't sure how the SoC would behave.
    Same thing happened with the first-gen fat PS3.


    It's impressive how close he got to the PS5's power consumption and performance with a PC.

    Also, that Navi 22 pulling only 125-130W of power at 2.21GHz shows how far away from its ideal power-performance curve the 6700XT is. It's also a nice indicator on how good the mobile Navi 22 GPUs could be.
     
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  6. iroboto

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    50% more power to get just 200 more Mhz. Power curve is cubic, and I'm pretty sure the trend here is still somewhat fitting.
    If they dropped it 400Mhz to 1800Mhz, they'd lose another 50% to 65W-70W I think.
     
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  7. Proelite

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    This is not a good source.
     
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  8. rabbit

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  9. ToTTenTranz

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    How could those values ever be close to the truth?
    1.2GHz GPU for 3.5GHz CPU? We just watched a guy clocking a 6700XT at 2.21GHz and a 8-core Zen2 CPU at 3.5GHz (+ 128bit DDR4 3600MT/s) to pull just 200W at the wall, which is what the PS5 pulls when playing games.
    How does suggesting the PS5 needs to practically halve the GPU clocks compared to a larger discrete RDNA2 GPU to get the same power consumption mean anything other than pointless FUD?
     
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  10. Globalisateur

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    Whatever the actual clocks of those specific debug modes, those are only used for testing / profiling during development. All retail PS5s are set in automatic mode.
     
  11. rabbit

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    Yes, it works automatically, but it's kind of a swing thing.
    When the GPU is maxed out then the CPU will have to significantly lower the frequencies. And vice versa.
    How multiplatform developers will deal with this remains to be seen.

    Did he test cpu-dependent games with low graphics settings (so that the CPU and GPU are about equally highly loaded)?
    + Navi 22 =/= ps5 GPU architecture
    Just like a retail videocard in one instance =/= ps5 GPU, as you can get both very good and not so good samples.

    And you must have missed my previous post:
     
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  12. Quadbitnomial

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    This paraphrase
    And this statement

    Are not the same. If you keep watching from your timestamp, he says;

    "with this new paradigm we are able to run way over that, in fact we have to cap the GPU frequency at 2.23GHz so that we can guarantee that the on chip logic operates properly"
     
    #292 Quadbitnomial, May 6, 2021
    Last edited: May 6, 2021
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  13. rabbit

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    Frequency mode switching can happen right in the middle of the frame. So conventionally we can say that for each individual frame both CPU and GPU were working with the maximum frequencies. But in fact it happened alternately.

    And in order to get the most out of this "new paradigm" a special approach to engine/game development is needed.
    It will not work effectively on its own.
     
  14. PSman1700

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  15. snc

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    he underclocked it
     
  16. PSman1700

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    And disabled 4 CU's while at it?
     
  17. snc

    snc
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    nope so you have 11tf
     
  18. Proelite

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    Still has an abundance of bandwidth that's not available on consoles.
     
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  19. snc

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    its about power consumption (40cu rdna2 clocked as ps5 gpu) and not performance mostly tough I'm curious how you calculated bandwidth as its only 384 gb/s, yes it has 96mb l3 cache that helps a lot but talking about bandwidth abundance in 6700xt case is overstatement :d
     
  20. Proelite

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    The infinity cache is a 2+x bandwidth multiplier according to AMD, and that holds up considering how well the 6900 does with only 512GB/s.
     
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