Should I force "Rebar" in games that aren't on Nvidia's approved list?

Discussion in 'Videocards - NVIDIA GeForce Drivers Section' started by BlindBison, Jul 4, 2022.

  1. BlindBison

    BlindBison Ancient Guru

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    Apparently Nvidia doesn't have very many games that they "officially" enable Rebar for even if your card supports it. As far as I know, AMD's solution on the other hand works globally.

    You can force Rebar using Nvidia Profile Inspector, but I've not really seen much comprehensive testing for unsupported titles, but it does seem to clearly help in some at least. Anyone test this out at all?
     
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  2. BlindBison

    BlindBison Ancient Guru

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  3. aufkrawall2

    aufkrawall2 Ancient Guru

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    I think it generally works without bad side effects if your system can handle rBAR well in general. Though it seems to increase total physical VRAM usage with some titles, and if they have a somewhat fixed threshold for when they clear data, it can affect performance when that threshold is exceeded more often/quickly. This seems to be the case in Watch Dogs Legion, it seems to throw out less data while driving without rBAR with less stutter accordingly.
     
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  4. Cave Waverider

    Cave Waverider Ancient Guru

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    The problem with AMDs solution is that you can't disable it for games that don't work well with it.

    Yes, we've been doing it since resizable BAR was first enabled in Nvidia's drivers and there have been threads on it on this forum as well. :)

    For some games it can give large boosts, I've noticed it really helping to boost and stabilize FPS in many games at high resolutions, especially demanding VR games. But there are some games where it has can have a negative effect, too (even some games where it's enabled by Nvidia/AMD by default where they run better when it's disabled).
     
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  5. BlindBison

    BlindBison Ancient Guru

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    Thanks a lot, that's helpful! I wish Nvidia would simply add a global/per profile toggle for Rebar in the control panel. Having to do the whole "3 flags in inspector" part is sort of annoying. Ideally there'd just be a global option with ('recommended/let the app decide' versus ON versus OFF) that they'd let you set in their official app seems to me.

    If I'm ranting on great options Nvidia excludes from their default control panel, I also find it super unfortunate that true half refresh v-sync is buried in inspector (the default control panel only has adaptive half refresh which doesn't play nice with the low lag v-sync blur buster's trick and all), but that's an issue for another time lol.
     
  6. BlindBison

    BlindBison Ancient Guru

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    upload_2022-7-4_20-8-12.png
    Just a direct picture for anybody that wants to tinker with this.
     
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  7. Mufflore

    Mufflore Ancient Guru

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    Using rebar would be an upheaval for my OS installs to execute and I havent seen a reason to bother yet such that its been off my radar.
    My games all run fine without any change.

    Maybe I'm missing something?
     
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  8. BlindBison

    BlindBison Ancient Guru

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    Going off some of the tests I've seen on YT from HW Unboxed for some example (it's been awhile, but assuming I'm remembering right), some games benefit a lot in terms of their 1% lows when Rebar is active. Now, by a lot I mean like 8% in some cases, but that's quite meaningful seems to me. Other games see no difference or even a very slight regression from what I gather (this is probably why nvidia has their list approach I imagine).
     
  9. dr_rus

    dr_rus Ancient Guru

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    No. It's blocked in the majority of titles because enabling it would lower performance and/or introduce stutters.
    Thus far I haven't seen any games in which enabling it via driver bits would improve anything to any noticeable degree.
     
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  10. aufkrawall2

    aufkrawall2 Ancient Guru

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    No difference to "whitelisted" games.
     
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  11. SyntaX

    SyntaX Master Guru

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    Looks lik a DOA Feature @ Nvidia.
     
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  12. Mufflore

    Mufflore Ancient Guru

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    Its not an NVidia feature.
     
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  13. Undying

    Undying Ancient Guru

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    Radeon gpus showing such a big increase in some games and not so big in others it can get ugly if amd improve up on it with rdna3 and zen4. Meanwhile nvidia have those inicial whitelisted 15 games a year ago lol
     
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  14. aufkrawall2

    aufkrawall2 Ancient Guru

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    It's 20. ;)
    But yes, a blacklist would make more sense. Even if it's often just ~3%, no idea why they waste this.
     
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  15. BlindBison

    BlindBison Ancient Guru

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    Yeah, I noticed this as well when "trying" to force the 3 flags. It seemed to make no difference whatsoever in the titles I tested so I wondered if it was even enabled at all to begin with.
     

  16. Astyanax

    Astyanax Ancient Guru

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    Rebar will have more impact when Directstorage is available and transactions above 256MB are desirable.
     
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  17. SyntaX

    SyntaX Master Guru

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    "Nvidia" added this "Feature" to the Driver/BIOS, so this Feature looks now like DOA. Added just for Marketing after AMD has used it so successfully. Satisfied now :rolleyes:
     
  18. mbk1969

    mbk1969 Ancient Guru

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    How much "successfully"? Twice more FPS?

    AMD added this feature for marketing too. Feature is as old as PCI Express bus.
     
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  19. Mufflore

    Mufflore Ancient Guru

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    https://www.pcworld.com/article/394...e-rates-for-free-resizable-bar-explained.html
    The "Feature" doesnt belong to NVidia, AMD etc, its part of the PCIE spec.
    Nvidia, AMD and Intel added support for it.
    It isn't an NVidia feature.
     
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  20. SyntaX

    SyntaX Master Guru

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    Why so Smartass like?, they added support to the Driver, never said they invented it.

    It feels so "half developed" that it is currently only released for 20 games. The user officially has no control over on or off in Control Panel. The list does not grow.

    I'd rather not say more. It feels here some seem to be immediately offended if you say something positive about AMD.
     
    Last edited: Jul 6, 2022

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