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What impact number of lines pci-e on performance in Iray

huntsman60huntsman60 Posts: 3
in Technical Help (nuts n bolts)

Hello!
On my motherboard has two PCI-E slots. One 3.0 x16 and second 2.0 x16 physical (really it works on 2.0 x4 speed). Now I use the GTX 1070 as the main and GTX 760 as slave. I want to put a second GTX 1070. How the tire performance will affect the rendering time in Iray? Does that make sense?
Sorry for my bad English.
Sincerely.​Thank you.

Comments

  • SzarkSzark Posts: 10,634

    I asked this myself not so long ago. No pluging a 3.0 into a 2.0 will not impact much. However as far as I know Iray would be better with you using the 760 as you main card and use the 2X 1070 for rendering. 

  • huntsman60huntsman60 Posts: 3

    Usually I use the built-in graphics as a video adapter that is connected to the display.

  • SzarkSzark Posts: 10,634

    which is normally an Intel Graphics Chip, not always but more often. Ok for just viewing but what about Daz Studio UI...it will use the onboard Graphics. Yes I know you select which cards are used for Iray Interactive mode but man you are mising out by not using your 760 as a main display card and just use the 1070s for rendering. What size Vram has the 1070 got?

  • prixatprixat Posts: 1,590

    In this post from the nVidia forums:

    https://forum.nvidia-arc.com/showthread.php?14672-PCIE-lanes-affect-on-IRAY-Performance

    He ran a 980 in an extender that was connected via a 1x slot and reports no difference in render performance.
    (That was a single PCIe 3.0 slot which is half the amount of your PCIe 2.0 x4.)

  • huntsman60huntsman60 Posts: 3
    edited February 2017
    Szark said:

    which is normally an Intel Graphics Chip, not always but more often. Ok for just viewing but what about Daz Studio UI...it will use the onboard Graphics. Yes I know you select which cards are used for Iray Interactive mode but man you are mising out by not using your 760 as a main display card and just use the 1070s for rendering. What size Vram has the 1070 got?

    I have only 2 slots. After I install 2nd GTX 1070, I would like to use them only for render. 1070 GTX has 8GB of memory.
    When using the Intel HD Graphics 4000 interface Daz3D works without any problems and freezing :-)

    prixat said:

    In this post from the nVidia forums:

    https://forum.nvidia-arc.com/showthread.php?14672-PCIE-lanes-affect-on-IRAY-Performance

    He ran a 980 in an extender that was connected via a 1x slot and reports no difference in render performance.
    (That was a single PCIe 3.0 slot which is half the amount of your PCIe 2.0 x4.)

    Thank you!

    Post edited by huntsman60 on
  • SzarkSzark Posts: 10,634

    I was gutted to find out I only had one slot and that my MB was so small I had to opt for a 730 single slot thick 4 GB Vram and only a punny 96 cuda cores. But hey it has made a big improvement overall so I am happy. With prixat's help (and others) I am now saving up for a new MB. I have the PSU to handle things in the future. Man two 1070's 8GB...I am envious. ;)

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