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Thread: Rendering Time - CPU faster than GPU?

  1. #1

    Default Rendering Time - CPU faster than GPU?

    Hello all,

    I've recently been performing render time test for an animations sequence i'm working on and the results are strange.

    I have 2x Quadro P6000 Graphics Cards and 2x Xeon Gold 6136 (48 CPUs)

    I'm testing 5 frames with 1x GPU, 2x GPU, CPU Only and 2x GPU + CPU.

    Testing on 1x Quadro P6000 a 4K Image at 8 Iterations With AI De-noiser on I got:

    Frame 1 : 35 Seconds
    Frame 2 : 27
    Frame 3 : 30
    Frame 4 : 27
    Frame 5 : 30

    Testing on 2x Quadro P6000 - Same

    Frame 1 : 35 Seconds
    Frame 2 : 29
    Frame 3 : 29
    Frame 4 : 29
    Frame 5 : 29

    Testing on 2x Quadro P6000 - Same + Use CPUs turned on

    Frame 1 : 37 Seconds
    Frame 2 : 33
    Frame 3 : 33
    Frame 4 : 33
    Frame 5 : 33

    Testing on CPUs only - Same

    Frame 1 : 33 Seconds
    Frame 2 : 21
    Frame 3 : 21
    Frame 4 : 22
    Frame 5 : 21

    It seems that rendering with just the CPU is actually quicker then both the GPU on or off.

    Ive run 'dxdiag' and it says i have driver version 23.21.13.9158 not sure what that is to the Nvidia version number?

    I am currently using version 1.8.13 or Iray+

    does anybody have any surgestions on whats wrong?

  2. #2

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    I am also using 3ds max 2018 - 20.0 - 20.3.0.3149 with is update 3 i think

  3. #3

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    Also I found the driver version its - 391.58

  4. #4
    Join Date
    Dec 2017
    Posts
    287

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    Hi Michael

    From your result I think in all your tests Iray+ used CPU's only.
    You need to check with additional software if your GPU's are using during the render.

    Did you check in Render Message window for any issues with GPU's?
    There you can see if you have a problem with GPU's and are they used or ignored on rendering.

    I assume, you turned On GPU's in Hardware section in Iray+ Render dialog?

    May be more info will help us to identify what is the problem and if there is a problem at all.

    You should definitely see difference in result when using 1 or 2 GPU's in render.

    Try to update to latest GPU drivers. It is important to use latest drivers as possible.

    Best!
    Nik

  5. #5

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    Hi Nik thanks for you response (:

    I checked Dells usage manager and also the Nvidia usage manager and they both go from 0 - 90+ when the renders start and then back to 0 when it stops.

    Yeah the GPU and CPU were ticked on and off for each test depending on the test I was doing.

    When I render with just the GPUs the CPUs stay at 0 so they are definitely not being used when they are turned off.

    Ill update to the most recent drivers and update when I can.

  6. #6

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    Quote Originally Posted by NikNastev View Post
    Hi Michael

    From your result I think in all your tests Iray+ used CPU's only.
    You need to check with additional software if your GPU's are using during the render.

    Did you check in Render Message window for any issues with GPU's?
    There you can see if you have a problem with GPU's and are they used or ignored on rendering.

    I assume, you turned On GPU's in Hardware section in Iray+ Render dialog?

    May be more info will help us to identify what is the problem and if there is a problem at all.

    You should definitely see difference in result when using 1 or 2 GPU's in render.

    Try to update to latest GPU drivers. It is important to use latest drivers as possible.

    Best!
    Nik
    Hi Nik,

    I've updated the drivers to the most recent one (911.95) and performed the test again (i've attached an image of the results).

    Click image for larger version. 

Name:	Render Results.jpg 
Views:	17 
Size:	220.4 KB 
ID:	10630

    When rendering, Converting the geometry takes less then a second then it buffers at 0% with a black screen for arround 80% of the time then the render starts.

    Regards,

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