Review: PCIe Resizable BAR Performance AMD Radeon 6000 and NVIDIA RTX 3000 series benchmarks

Discussion in 'Frontpage news' started by Hilbert Hagedoorn, Apr 30, 2021.

  1. Hilbert Hagedoorn

    Hilbert Hagedoorn Don Vito Corleone Staff Member

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  2. cucaulay malkin

    cucaulay malkin Ancient Guru

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    what a strange case 6800 is.I mean overall,not just in sam performance.
    18% slower than 6800xt in legion,4% in cp2077
     
  3. Undying

    Undying Ancient Guru

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    Beside vallhalla its not bringing a world of difference and in some cases games even run better with rbar off.
    It will be interesting if the trend continues with new gpus/cpus so every game sees benefit not only few.
     
    JonasBeckman and Maddness like this.
  4. Kool64

    Kool64 Maha Guru

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    once again Valhalla makes AMD look amazing. Those gains are quite impressive. Too bad no other game really benefit either manufacturer.
     

  5. bobnewels

    bobnewels Master Guru

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    Thanks for the test, a lot of work and good job .I will leave rebar on my PC on.
     
  6. ViperAnaf

    ViperAnaf Master Guru

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    now lets try it again without the biased AMD cpu...try it with 11900k
     
  7. Hilbert Hagedoorn

    Hilbert Hagedoorn Don Vito Corleone Staff Member

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    You're welcome to drop by and perform the 500 tests yourself ;)
     
  8. Kaarme

    Kaarme Ancient Guru

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    Maybe there's something about the new console generation, based on the Zen architecture, that encouraged AMD to start experimenting with resizable bar on the PC side. Consoles have a unified memory for the APU, after all.
     
  9. kapu

    kapu Ancient Guru

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    You are on to something.
     
  10. psychic717

    psychic717 Member

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    As expected, Watch Dogs Legion has stuttering associated with ReBar. It has been reported repeatedly since ReBar was released and it is again confirmed here.
    Even though Nvidia white-listed it, it should be turned off for Watch Dogs Legion.
     

  11. Hilbert Hagedoorn

    Hilbert Hagedoorn Don Vito Corleone Staff Member

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    Ah yes, that would definitely confirm what we're seeing in the frametime plots.
     
  12. Rich_Guy

    Rich_Guy Ancient Guru

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  13. Cplifj

    Cplifj Member Guru

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    Good Grievans, it only works from 4th gen intel cpu on ....
    Jeebus, i guess i'm lucky that amd's HBCC wants to work on a 3e Gen i7 it seems; when the technologies aren't all that different.
    But yea we know, sales overpower the need for stuff , whether it still works perfectly or not, you should buy buy buy,
    Evermore features that can't even be called features because they make little to no difference. On the other hand , a nice path for hacking is created again.
    Good show for all those GPU miners.
     
  14. kapu

    kapu Ancient Guru

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    And please enlighten us how this CPU is biased ?
     
  15. IceVip

    IceVip Master Guru

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    He probably doesn't like the fact that it has twice the cores and uses less power. It's quite unrealistic in the world of intel, therefore - use something realistic.
     
    Neo Cyrus likes this.

  16. Darwinius

    Darwinius New Member

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    I think it's quite obvious why that is so.. Nvidia is innovating some heavy duty features like DLSS and Ray Tracing, so what is small fish AMD to do when lacking those big features? They must refrain from even mentioning them, since they're unable to compete.. But the have to offer something! So what do they offer? Any suggestions?

    They have to offer SOMETHING to at least give an appearance that they are in "leadership position", and to throw a bone to their fanboys... That's why they're going with these somewhat trivial semi-nonsensical features like SAM, sharpening tools, anti-lag, etc.. It gives them plenty of marketing materials... Which then also forces Nvidia to offer those same features.

    But in the end one can say that both companies are innovating goodies for us, AMD is just offering different ones. As for the real features, JUST WAIT. :)
     
    Last edited: Apr 30, 2021
  17. Reddoguk

    Reddoguk Ancient Guru

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    The 1080p results look promising for nVidia but soon as you up it to 1440p or 4K then the results are within testing variances.

    It's seems nVidia are better at 1080p but AMD get better results at 1440p/4K.

    Like people have already said, this method isn't anything new but still there could be future updates/patches that help make Re-bar work much better.
     
  18. Mufflore

    Mufflore Ancient Guru

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    Yeah, I'm not going there for some time.
    My current experience is great at slightly lower res than UHD (with 3090 + 10700K) and its gonna be a right pita getting my hard drives/SSDs off CSM, plus all the updates required for REBAR.

    I'll wait until I encounter a problem it will fix.
     
    Airbud likes this.
  19. kanenas

    kanenas Master Guru

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  20. tty8k

    tty8k Master Guru

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    Thanks for the great review which confirms my personal tests too.
    On a 9900k and 3070 using 2k resolution I gained literally nothing in my games.

    Sad story, as people thought this might be a decent performance upgrade for free (5-10%).
    Well, it's not.

    I also lost about 1-2% cpu performance converting to UEFI boot.

    Software development wise looks like nvidia is swimming backwards lately, including the miriad of issues with the drivers.
     

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