What programs actually use the memory on a Graphics card?

Discussion in 'iMac' started by zm15, Jul 2, 2015.

  1. zm15 macrumors newbie

    Joined:
    Jul 2, 2015
    #1
    I noticed that the Graphics Card memory is hardly used at all, even during Cinebench 3D testing despite the FPS being high. What programs actually use the graphics card memory?

    Trying to determine if the M295x is worth the money to upgrade in a new iMac. (I do mostly video editing with Premiere Pro and After Effects)

    Currently running an iMac 5k with the M290x card.

    Here's a screenshot running Cinebench 3d test - high FPS, no GPU memory being used...

    [​IMG]
     
  2. WilliamG macrumors G3

    Joined:
    Mar 29, 2008
    Location:
    Seattle
    #2
    Interesting. Here's my i7 M295X after a fresh reboot, just running Mail and iTunes in the background, and a couple of Safari tabs with no video running.
     

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  3. jerwin macrumors 65816

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    Jun 13, 2015
    #3
    I have a m290x as well, and istatMenus doesn't seem to show much, if any VRAM usage. I think it's a bug with iStatMenus. It would be an enormous help if I could rely on this utility to help me configure graphics options, but I think that it's inaccurate for both m290x and m295x cards. The frames per second jumps around a lot, from 3.7 to 37 fps when I'm just running the basic Safari, Mail, Finder configuration.

    On the other hand, I tried running the company of heroes benchmark (at 1024*768; ultra settings, windowed, so that I could pay attention to istat menus, and got 336 max, 161 avg, 68 min), which seemed to correlate with ista's fps indicator, at least somewhat.
     
  4. zm15 thread starter macrumors newbie

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    Jul 2, 2015
    #4
    Thanks for sharing guys. It certainly raises more questions than answers. I wish there was a way other than GPU temp to measure the processor load. I'm not sure I'm convinced the 295x is worth the upgrade for performance, but perhaps resale value.
     
  5. filmak macrumors 6502a

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    Jun 21, 2012
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    between earth and heaven
    #5
    Sorry for the off topic.
    Is it possible to have a screenshot showing istat's temps under similar conditions?
     
  6. zm15 thread starter macrumors newbie

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    Jul 2, 2015
    #6
    +1
     
  7. filmak, Jul 3, 2015
    Last edited: Jul 3, 2015

    filmak macrumors 6502a

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    Jun 21, 2012
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    between earth and heaven
    #7
    Imho the 4 gb of the m295x are alone worth the upgrade especially if you 're using an additional external display.
    iMac alone has a lot of pixels to process and the specs for software are always going higher.

    I also think that these video editing programs are using during processing the video ram and if it's not enough, they crash especially with the current high video resolutions.
     
  8. jerwin macrumors 65816

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    Jun 13, 2015
    #8
    Supposedly you can use the OpenGL Monitor to figure this out. It's an optional bit of XCode.
    the manual states:
    Current Video Memory in Use

    The total number of bytes of VRAM in use. This parameter is vendor specific and not available for all drivers. vramUsedBytes​
     
  9. laurim macrumors 68000

    laurim

    Joined:
    Sep 19, 2003
    Location:
    Minnesota USA
    #9
    I know the performance of Apple Motion is highly dependent on the GPU.
     
  10. hatandsuitcase macrumors newbie

    Joined:
    Jul 3, 2015
    #10
    Bare Feats has a direct comparison. Seems to me that CPU plays a bigger role than GPU on the pro apps.

    http://barefeats.com/imac5k6.html

    I have no expertise in premiere, but in After Effects it has been my observation that the best way to make it faster is to throw RAM at it.
     
  11. jerwin macrumors 65816

    Joined:
    Jun 13, 2015
    #11
    The thing about bare feats is that, they typically compare an i7/m295x with an i5/m290x, so there's no way to break it down.

    And even if they compare video cards, it's typically (D300/4 core, D500/6 core, D700, 8 core), a least for the After Effects benchmarks. Maddening.
     

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