Serious Sam VR mGPU NVIDIA GTX Pascal Follow Up @ [H]

Discussion in 'VR & Head-Mounted Displays' started by Kyle_Bennett, Nov 30, 2016.

  1. Kyle_Bennett

    Kyle_Bennett HardOCP MasterChef Editor Staff Member

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    Serious Sam VR mGPU NVIDIA GTX Pascal Follow Up - Serious Sam VR was the first commercial enthusiast gaming title to include multi-GPU support with AMD's RX 480 GPU. Now the folks at Croteam have added mGPU support for NVIDIA cards as well. We take a look at how well NVIDIA's VRSLI technology fares in this VR shooter title.
     
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  2. Quartz-1

    Quartz-1 2[H]4U

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    Your conclusion seems unduly negative about the performance improvement. In particular, you don't mention that reprojection was almost eliminated on the 1080 SLI and 1070 SLI in Ultra mode. As you said, all these cards are really good enough on their own, so I'd really like to see you take a look at the performance of previous generation cards. How do the GTX 970, 980, 980 Ti, and Titan XM fare in SLI? (I, of course, have a particular interest in the last. :))
     
  3. Kyle_Bennett

    Kyle_Bennett HardOCP MasterChef Editor Staff Member

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    I was expecting much better scaling.

    If you think I did not mention that, you did not read the article.
     
  4. ecmaster76

    ecmaster76 Gawd

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    That's a shame about the 1060. Maybe they will relent at some point.
     
  5. JosiahBradley

    JosiahBradley [H]ard|Gawd

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    I had a Vive in my shopping cart on Monday.... I would love to test this out on my 290x(s) to see if better AMD hardware sees similar or worse scaling. Looking at how well croteam's engine scales on my current setup with SS3 and The Talos Principle (170 fps+ at 1440p max settings) I'm hoping for good results.
     
  6. Kyle_Bennett

    Kyle_Bennett HardOCP MasterChef Editor Staff Member

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    I would too, but I am not buying another Fury X, one was enough.
     
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  7. Stoly

    Stoly [H]ardness Supreme

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    That says a lot
     
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  8. pj-

    pj- Limp Gawd

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    valve already set expectations for VR SLI scaling 18 months ago

    [​IMG]

    (that's from gdc 2016 but his 2015 talk says the same thing)


    Single pass stereo rendering on solo GPUs will make VR mGPU even less appealing. Not sure if Serious Sam is already using that
     
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  9. Kyle_Bennett

    Kyle_Bennett HardOCP MasterChef Editor Staff Member

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    SPS should give a significant increase as well on top of mGPU as it is cutting the triangles it has to draw in half. Not sure what your statement is actually saying... To my knowledge, VR SLI and LiquidVR Affinity are the only features being used by SSVR currently.
     
  10. pj-

    pj- Limp Gawd

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    Single pass stereo necessarily only works on one gpu.

    How can you render the triangles once for both eyes if each eye is being rendered on a separate physical device?

    Each GPU needs basically all of the rendered geometry, since the eye views mostly overlap. This is the reason SPS gives a big performance boost. You can't split up the SPS work between the GPUs so either they both have to render their own geometry (current method) or one GPU has to do SPS and then send the results to the other gpu, which would add latency and mean that one of the GPUs is idling for a lot of the time.
     
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  11. Kyle_Bennett

    Kyle_Bennett HardOCP MasterChef Editor Staff Member

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    Never thought about it that way. Interesting. Going to ask the question and see what answer I get, but I do certainly get the logic you have laid out here.
     
  12. Stoly

    Stoly [H]ardness Supreme

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    Well technically speaking SPS should be SLI capable but instead of paralel rendering it would be sequential like AFR.

    I'm really intrigued by nvidia's simultaneous multi projection. Not only can it be used in VR and multimonitor setups but apparently it could also be used to increase performance in high resolutions like 4K
     
  13. Kyle_Bennett

    Kyle_Bennett HardOCP MasterChef Editor Staff Member

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    You are dead on correctomundo!

    Single Pass Stereo is for single GPU. The idea is that geometry can be created on the GPU once and then 2 different projections can be run (left and right eye) saving geometry setup and processing work.

    In VR SLI each GPU renders a single eyes view. That means the geometry processioning can’t be shared since the processing is physically separated.
     
  14. twzTechman

    twzTechman Limp Gawd

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    Agree - the scaling would likely be closer to what was seen on the AMD480.
     
  15. shad0w4life

    shad0w4life Limp Gawd

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    Not really, everyone can have bad good experiences with anything.

    Eg, after this 1070 purchase I highly recommend friends don't buy it and get something cheaper since it's pretty much "meh", sucks at ARMA 3 and struggles to run my older steam library games such as F.E.A.R:Extraction point over 60FPS. $900 price tag I expect more(Mobile Platform and CAD Pricing). Along with Drivers that work for the GPU and Gsync, but I'm asking too much there judging by past few releases.

    However if I was a VR junkie with a full setup and compared this to AMD card I have I'd be blown away.
     
    Last edited: Nov 30, 2016
  16. pj-

    pj- Limp Gawd

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    I'm guessing AFR isn't done with VR for latency reasons
     
  17. Trepidati0n

    Trepidati0n [H]ardForum Junkie

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    Hate to say this..but my biggest take away from the review so the coop announcement. As a sword art online fan...this is just one step closer to that reality; even though it will probably not happen in my lifetime.
     
  18. Swolern

    Swolern Limp Gawd

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    Good stuff as alway Kyle. Was hoping for some better scaling also. I really wanted to crank up Supersampling in SSVR. But hey it's a start.
     
  19. InquisitorDavid

    InquisitorDavid n00bie

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    As with a lot of things AMD has had in the past, starting from a low point makes gains easy.

    I'm inclined to think there was a significant bottleneck with the RX480, likely geometry. Splitting the geometry workload evenly between 2 GPUs will result in a significant uplift in performance if that was one of the primary limiting factors previously. Meanwhile, NV has historically never had that issue, thus the performance increase is much less.

    We'll have to see if there will be any further development or at least a response from Croteam. I'm interested in what they have to say on the matter.
     
  20. Kyle_Bennett

    Kyle_Bennett HardOCP MasterChef Editor Staff Member

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    This may be true on the AMD side of things, but surely I think we should have seen better scaling with VR SLI. Certainly though, this is all still early on. Croteam has not gotten back to me on my questions yet.
     
  21. InquisitorDavid

    InquisitorDavid n00bie

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    The gains are possibly mitigated by multiGPU latency. Where the RX480 had the aforementioned bottlenecks eliminated (creating a big perf boost), though there is some gains on the NV side to be had, it's slightly offset by the synchronization latency.

    Hope they respond soon so we have a definitive answer, though.
     
  22. noko

    noko 2[H]4U

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    OMG! Looks the First Encounter is now available - Full Game - Early access with different options or combination of options for motion in the game. Good for Vive and Rift.



    I am going to kick myself for not getting the Vive with the $100 off or the Amazon.com Rift with the $100 gift card. I wonder if this supports SLI/CFX like Serious Sam VR?

    If you already own First Encounter HD you get another 10% off.
     
    Last edited: Dec 21, 2016
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  23. heatlesssun

    heatlesssun Pick your own.....you deserve it.

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    Thanks for the info! It's showing up for $23.99, 40% off, I have First Encounter HD so maybe that's it. Runs until next Tuesday. Yeah, the Vive was on sale for $699 at the Microsoft Store plus a $100 coupon at the Microsoft Store Black Friday store so picked it up then. Haven't opened it yet. Got a lot of stuff to setup, the Vive, a Samsung 4k TV and I'm replacing my current 3D monitors with ones that have a display port connector as using adapters just borks 3D.
     
  24. noko

    noko 2[H]4U

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  25. noko

    noko 2[H]4U

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    Currently Microsoft has a $100 gift card with the Vive or Rift. Was thinking about the Rift and use the $100 for the Touch controllers but none are available :(.

    Man you gotta get that setup going, this is looking better as time goes on.
     
  26. noko

    noko 2[H]4U

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    SSVR Last Hope is very fun to play! Great game. SLI working on two 1070's.

    First Encounter SLI also works, I just don't have the motion down yet to play it effectively.
     
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  27. heatlesssun

    heatlesssun Pick your own.....you deserve it.

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    How do you determine that SLI is active? Thanks!
     
  28. noko

    noko 2[H]4U

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    Using GigaByte Etreme Gaming software it shows 2nd card speed and usage. Usage was around 80%.
     
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