Why isn't "Resizable Bar"/SAM supported for the RTX 2000 & Super GPUs?

Discussion in 'Videocards - NVIDIA GeForce Drivers Section' started by BlindBison, Apr 6, 2021.

  1. BlindBison

    BlindBison Master Guru

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    I have a 3900X + 2080 Super GPU with a ASRock X570 Board -- I've fully updated the BIOS, CPU chipset drivers, GPU driver, and Windows installation. My motherboard supports the feature and my understanding is that the Ryzen 3000 series CPUs are supported as well so the only thing left is on Nvidia's end if I'm understanding correctly.

    Currently they only have the feature enabled/functioning on their latest 3000 series GPUs, but is there really some hardware reason that it can't be done for the 2000 series GPUs or is Nvidia just being greedy and trying to force users to upgrade or some nonsense? Perhaps I'm misunderstanding something, but SAM simply allows the CPU to access/allocate more than the standard 256 MB of VRAM at a time no? Why would changing this require some "special modern hardware that only the 3000 series cards are capable of" -- at a glance, that seems hard to believe, but perhaps I'm wrong -- it could be my understanding is incorrect there.

    It just seems crappy that if you have a 2000 series or Super GPU then you can't use Resizable Bar/SAM even if the rest of your components all support it after updates. If there's not some hardware limitation on it being doable, I really think Nvidia should enable the feature at least one or two generations back.

    If they can do it and just won't, I find that pretty irritating. Or is their plan to enable the feature down the line? Thus far I've not heard anything about that yet, but here's hoping.
     
    Last edited: Apr 6, 2021
  2. Dan Longman

    Dan Longman Member Guru

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    Technically it would be possible on Turing and older, but it requires a vBIOS update to enable. And the vendors need to implement it - I don't think its a nefarious reason to not support it other than the work required is not logistically simple - Though maybe they will do it down the road.
     
  3. BlindBison

    BlindBison Master Guru

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    Here's hoping -- would be a great "nice to have" seems to me.
     
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  4. SabotageX

    SabotageX Active Member

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    Not gonna happen. Nvidia doesn't update older gen hardware.
     
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  5. BlindBison

    BlindBison Master Guru

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    Well that sucks :(
     
  6. DannyD

    DannyD Ancient Guru

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    Someone could make a pretty penny if they managed to hack the bar enabler (found in the new 30 series bios') to work on older bios'.
    I'd pay a decent amount (30-40 quid) for a bar enabled bios.
     
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  7. Undying

    Undying Ancient Guru

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    Rtx3000 and rx6000 only dont get your hopes up.
     
  8. DannyD

    DannyD Ancient Guru

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    ah 30 series and 60 series only ah.
     
  9. Noisiv

    Noisiv Ancient Guru

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    and in other news today:

    [​IMG]
     
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  10. SaiBork

    SaiBork Master Guru

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    That's software which doesn't require a firmware/bios of hardware to be updated. Also, it was already possible to be done by users themselves, so Nvidia werent able to say that it wouldnt work using older hardware.

    The problem to enable ReBar is that it requires a firmware/bios update of the cards and that's just very unlikely that it will ever happen.
     
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  11. Noisiv

    Noisiv Ancient Guru

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    One is software update, and the other is a software update. Got you :)
     
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  12. skacikpl

    skacikpl Master Guru

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    Highly unlikely given that would put 3000 series as just being plainly stronger than 2000 series without any exclusive features.

    Either way at the moment it doesn't make much difference since supposedly RBAR needs to be also supported on per-game basis.
     
  13. squalles

    squalles Master Guru

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    because nvidia want you buy a new rtx 3000 series
     
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  14. insp1re2600

    insp1re2600 Ancient Guru

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    never know with the resurgence of older cards to fill in the mining gaps.
     
  15. dr_rus

    dr_rus Ancient Guru

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    If it was in Nv's hands they'd do it. But it is in AIBs hands, and that makes things a lot more complex.
     

  16. cucaulay malkin

    cucaulay malkin Ancient Guru

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    Vega got HAGS,Pascal didn't.
     
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  17. IDSG89

    IDSG89 Member Guru

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    Pascal has HAGS since last year, infact was released alongside the RTX 20xx support
     
    Last edited: Apr 7, 2021
  18. The Goose

    The Goose Ancient Guru

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    Your supposed to buy an rtx 3xxx, that way you get the latest tech and keep the scalpers in the lifestyle they are accustomed too.
     
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  19. DanielRX

    DanielRX Active Member

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    Nvidia Pascal = HAGS Support OK
    AMD RX Vega = No Support for HAGS
    Nvidia Pascal = No Support for ResizeBar
    AMD RX Vega = ResizeBar Support OK
    $$$$$$$$$$$$$$$$$$
     
    Last edited: Apr 7, 2021
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  20. cucaulay malkin

    cucaulay malkin Ancient Guru

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    [​IMG]
     
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