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SLI and Iray

ScarletX1969ScarletX1969 Posts: 587
edited December 1969 in The Commons

Are there any benefits to using two of the same video cards (NVIDIA GT 740s) in SLI for a boost in rendering time using Iray in Daz Studio? Anybody test ti or is there a thread talking about it?

Comments

  • Male-M3diaMale-M3dia Posts: 3,584
    edited December 1969

    Using SLI isn't recommended for Iray.

  • ScarletX1969ScarletX1969 Posts: 587
    edited December 1969

    Male-M3dia said:
    Using SLI isn't recommended for Iray.

    Just because it's not recommended doesn't mean it hasn't been done. :) So, I'm sure someone on this forum has done it or seen it. When has something not being recommended stopped us innovators? LOL!

    I did read somewhere that you just have to run two cards side by side without SLI and the render has to be able to fit on the VRAM of both cards. Has anyone tried this?

  • SorelSorel Posts: 1,412
    edited December 1969

    dsexton72 said:
    Male-M3dia said:
    Using SLI isn't recommended for Iray.

    Just because it's not recommended doesn't mean it hasn't been done. :) So, I'm sure someone on this forum has done it or seen it. When has something not being recommended stopped us innovators? LOL!

    I did read somewhere that you just have to run two cards side by side without SLI and the render has to be able to fit on the VRAM of both cards. Has anyone tried this?

    It's not recommended because it doesn't do anything. Like Octane Render, it will utilize however many cards you have if allowed. From my understanding, textures and geometry will only fit onto the main card, while the other cards just help make rendering faster.

  • fixmypcmikefixmypcmike Posts: 19,682
    edited December 1969

    You should not use SLI, it causes conflicts. If you have multiple cards and tell Iray to use all of them it will use all the cores, but each card's memory is distinct, so you're still limited by the memory on each card.

  • mjc1016mjc1016 Posts: 15,001
    edited April 2015

    Benefits to using two cards, yes.

    Iray should detect both cards and use them.

    "Doctor, my arm hurts when I bend it like this."

    Well, don't bend it like that..."

    That kind of 'not recommended'. Using SLI + Iray isn't just a 'we haven't tried it, so can't say', but rather 'we've tried it and it doesn't do nice things' recommendation.

    Post edited by mjc1016 on
  • ScarletX1969ScarletX1969 Posts: 587
    edited December 1969

    I hear what you all are saying....

    Then I ran up on this...

    http://www.daz3d.com/forums/discussion/54056/

  • mjc1016mjc1016 Posts: 15,001
    edited April 2015

    And?

    You can use as many cards as you can fit into the slots on your motherboard...but that doesn't mean that they need to be in SLI. SLI does not mean running more than one card...it is one way to run multiple cards, but not the only one.

    Post edited by mjc1016 on
  • ScarletX1969ScarletX1969 Posts: 587
    edited December 1969

    mjc1016 said:
    And?

    You can use as many cards as you can fit into the slots on your motherboard...but that doesn't mean that they need to be in SLI. SLI does not mean running more than one card...it is one way to run multiple cards, but not the only one.

    Okay, I know what Scalable Link Interface is. Two, you could've kept the "And?" sarcasm. Wasn't asking for that. Now, honestly, I think my question has been answered. So, no to SLI but I can run two cards side by side and even better if they are identical. I did read in that post I reference that the scene has to fit on the VRAM, so it's something I can test later on.

    Thanks everyone for answering, if there was some snarky sarcasm in there for flavor. :)

  • kitakoredazkitakoredaz Posts: 3,526
    edited September 2015

    Hi .I finally order new  PC with  two GTX 980 Ti set (which can work as SLI )

    , and clever CPU than my old Dell PC . cheeky

    Then I want  to know best setting for iray with daz studio. 

    I read user recommend not use SLI for iray (daz studio),crying

    it will conflict?

    But that maens, you recommend not use two same navida card as SLI mode,

    but I can get benefit of two video card?

    then I only need to set SLI mode OFF for video card by controll panel etc

    (I do not know ge-force controle pane name. but it should be ,,)

    when I render by ds iray, after all  I can get benefit of two video cards?

    Post edited by kitakoredaz on
  • fixmypcmikefixmypcmike Posts: 19,682

    You will get the benefit of using multiple cards with Iray, but do not use SLI.

  • Liquid RockLiquid Rock Posts: 9

    iRay uses only CUDA Cores for rendering within a iRay compatible App such as DAZ Studio! That means, anyway you've got an SLI Config or not, iRay detect automatically all installed CUDA Adaptors and will use them if activated!

  • DAZ_SpookyDAZ_Spooky Posts: 3,100

    SLI is not recommended by NVIDIA because disabling SLI makes the render using the cards, that would be nominally be used is faster. Further not disabling SLI can cause crashes.

    That does not mean don't use two cards, that means, specifically, disable SLI. (The same with ECC Memory on the high end Quadro cards, disable it.) It is a simple switch in the NVIDIA Control panel to turn on or off SLI. 

     

    Yes, I have personally seen the down side to all of these. 

  • mjc1016mjc1016 Posts: 15,001
    DAZ_Spooky said:

    SLI is not recommended by NVIDIA because disabling SLI makes the render using the cards, that would be nominally be used is faster. Further not disabling SLI can cause crashes.

    That does not mean don't use two cards, that means, specifically, disable SLI. (The same with ECC Memory on the high end Quadro cards, disable it.) It is a simple switch in the NVIDIA Control panel to turn on or off SLI. 

     

    Yes, I have personally seen the down side to all of these. 

    On the other hand, if you don't need SLI for gaming...don't bother enabling it when you install the cards....then there is no need to turn anything off.

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