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. dr_rus

    dr_rus Ancient Guru

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    Nah it's 100% s/w feature beyond the basis PCIE implementation. There's nothing to "design the h/w" for here outside of simply making the bus and RAM faster.
     
  2. Nekrosleezer

    Nekrosleezer Member Guru

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    yeah just like that, once you put a pcie slot (gen 3 or 4) onto the motherboard it will support all its features, you just need to do some changes on the firmwares
     
  3. DannyD

    DannyD Ancient Guru

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    Nvidia scared to enable it on 20 series cause it would boost hash rates no doubt and nvidia dont boost hash rates for free.
     
  4. JonasBeckman

    JonasBeckman Ancient Guru

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    Once it's tested all that would be needed is additional UEFI bios updates for the 1000 and 2000 series of GPU's no? That's the only restriction here so it could probably be done and it'd be nice if both NVIDIA and AMD allowed additional cards to support it.
    Going forward the number of games that can benefit from it should increase and if there's no limits then the coding and usage practices could also see further gains over the prior limit. :)

    Just depends on whether the GPU vendors will actually provide said bios updates or not, not sure what AMD thinks of the Navi10 cards even less so for the GCN range of hardware but similar to NVIDIA there has to be quite a number of Pascal and Turing GPU users and if there's no additional complications those should benefit too just as long as compatible bios updates are provided for drawing upon this functionality.

    EDIT: Well that or a ReBAR sticker on GPU boxes going forward for selling Ampere and newer and Navi20 and newer.
    That's about what I expect but it'd be nice to be surprised and see older but still widely used and still popular cards get supported if nothing else is hindering said support.
     

  5. Chrysalis

    Chrysalis Master Guru

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    All for marketing and selling newer GPUs.

    Note how they attempted to prevent most games been used for Rebar, and we now know why, it seems very few games on Nvidia platform benefit from it, and we cant let reviewers showcase that hence locked driver, sadly for them some of the reviewers did research, they found out how to use it on non whitelisted games and even discovered some whitelisted games dont quite work so well as Nvidia have stated.

    Nvidia probably should have took their time and released something in a better state, I expect in a year's time Rebar will work much better than it does now. But it was rushed because, that marketing.
     
  6. Mineria

    Mineria Ancient Guru

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    Same as adding 12GB on the RTX 3060, all just for marketing.

    As for support for 20 series, it should at least work properly with all them whitelisted games on the 30 series, else it will end up giving more pain than gain.
    If Nvidia would have been smart about it, they wouldn't have release a whitelist to begin with and maybe even developed it a bit more before letting it out in the wild.
     
  7. magic09

    magic09 Member

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    Yes I have an RTX 20 series card purchased less than an year ago and the bar for customer support QA is set so low it seems by people sometimes. Buying a 700 dollar piece of equipment I expect and hope a company would support such a product within that timeframe. Nvidia make your board "partners" atleast update bios for 20 series cards just no excuse. Logistics be damned it is not that hard and the price of these products warrant such support. The whole business model is bizarre to me anyways on a side note. I hate monopolies and tech sector is fulle of them(de facto duopolies oligopolies) but why do these "board partners" even exist? Nvidia just do it themselves now if they didnt already make their own complete products like an Intel thats one thing but they do so why?
     
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  8. Reddoguk

    Reddoguk Ancient Guru

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    I think all RTX cards should get Rebar support but for all i know it won't work well on none 3000 series cards and may just cause nVidia more headaches than it's worth.

    Until it's proven to work flawlessly on 2000 series cards then i wouldn't want to risk it.
     
  9. Aegis

    Aegis Member Guru

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    ReBar doesn't boost hash rates.
     
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  10. bobblunderton

    bobblunderton Master Guru

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    Y'all want support for it on GPU's that were designed before it was desired by users, that often don't have enough spare VRAM for it to really be effective without taking often-needed VRAM from the game's texture/model pools.
    The reason it's not supported on 6gb/8gb 2000-series GPU's is because with 6~8gb of VRAM you will find you use most of (if not outright all of) that when running almost any recent 3D game. You really should only think about ReBar / SAM on a GPU with at-least 12gb of VRAM, because at the current time, a few of the new games (and a select few modded older games or ones with high-def texture packs) are already wanting just over 8gb of VRAM.

    The 12GB is *NOT* for marketing, it's because Nvidia was seeing the 12gb / 16gb cards from AMD as a threat, and because people are sick of the same 6gb~8gb cards they've had since 2014 - you know - SEVEN years ago!
    Games are FINALLY (and I admit it was wanting < 8gb for quite a while) now wanting more than 6~8gb of VRAM. It will be used.
    Buying a 6~8gb card right now is a fools errand unless it's a budget / mainstream card that you replace every 2 years or so. Try to get something with 12~16gb if possible so it actually lasts a while and you don't have a FAST MUD card in two years (with MUD textures due to lack of VRAM).

    My old RX 480 8gb card served well outside of driver crashes with my modeling software. I bought it in fall of 2014, but it was still fast enough when replaced in 2019.
    In DEC 2019 I got a 2070 Super 8gb due to driver crashes, paid a bit much, but it was 'what is available' the first week of December that could ship within the week. Long story short, I knew it wasn't going to be enough - and I'd have been better off with a Radeon VII 16gb which I could have gotten - but the driver crashes on the red-team in 2019 pushed me away.
    That's okay though, I should have gotten the Radeon VII anyways as the driver crashes happen almost as much on the green team just at different times in different places - even on the Studio-Ready drivers.
    It's OK though, they're slowly fixing them & not quite as common now. 8GB is not enough VRAM though and I don't fancy the lag from running out of it doing game-dev stuff here.

    The only reason Nvidia kept cards at 6~10gb for as long as they have, is because they want the cards to be obsolete sooner, as soon as possible actually, so you will buy another one.
     
    Last edited: Apr 28, 2021

  11. Aegis

    Aegis Member Guru

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    The irony is, that in all the tests I've seen (on both nvidia *and* AMD), ReBar/SAM seems to benefit CPU-bound scenarios at 1080p the most - 1440p gains significantly less performance than FHD and 4k even more so - I'm curious to see whether this changes in future titles/driver updates or whether this is going to be the norm.
     
  12. The Goose

    The Goose Ancient Guru

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    Your not missing a great deal atm, by the time its worth the trouble you`ll be on 3k anyway.
     
  13. Mineria

    Mineria Ancient Guru

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    Correction: Adding 12GB on the RTX 3060 is just for marketing to counter AMD's amount of memory on their cards.

    Not arguing about that more than 8GB is the future. but you do understand that it's rather unrealistic to run 4K in a way that uses all the memory without making it an low fps stutter hell on the 3060?
    Memory bandwidth needs to accommodate the amount of memory, just look a bit back at the cards with more memory than reference released by AIB partners or AMD's cards for that matter.
    Adding a crap load of memory isn't enough if the rest of the card can't keep up.
     
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