BareFeats has posted some eGPU benchmarks

Discussion in 'iMac' started by EugW, Jul 20, 2017.

  1. EugW macrumors 68020

    EugW

    Joined:
    Jun 18, 2017
    #1
    I'm surprised nobody posted this, since it's already two weeks old, but BareFeats has provided us with some benchmarks of the iMac 5K 2017 with eGPUs. Yes, that's plural, since he tested with both a single eGPU and a dual eGPU setup.

    http://barefeats.com/imac17egpu.html

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    GRAPH LEGEND
    eGPUs>1080Ti*2>Built-in - Dual GeForce GTX 1080 Ti (11GB) GPUs one in the Sonnet eFGX Breakaway Box and one in the AKiTiO Node eGFX Box but using only the iMac 5K's built-in display.
    eGPUs>1080Ti*2>Dell - Dual GeForce GTX 1080 Ti (11GB) GPUs one in the Sonnet eFGX Breakaway Box and one in the AKiTiO Node eGFX Box with one GPU connected by dual DisplayPort cables to an external Dell 5K display
    eGPU>1080Ti>Built-in - One GeForce GTX 1080 Ti (11GB) GPU installed in Sonnet eFGX Breakaway Box but using only the iMac 5K's built-in display
    eGPU>1080Ti>Dell - One GeForce GTX 1080 Ti (11GB) GPU installed in Sonnet eFGX Breakaway Box and connected with dual DisplayPort cables to an external Dell 5K display
    eGPUs>RX480+580 - One AMD Radeon RX 580 GPU installed in Sonnet eFGX Breakaway Box and one AMD Radeon RX 480 GPU installed in the AKiTiO Node eGFX Box
    eGPU>RX580 - One AMD Radeon RX 580 GPU installed in Sonnet eFGX Breakaway Box and connected with dual DisplayPort cables to an external Dell 5K display
    Pro580 - '2017' iMac 5K with 4.1GHz Quad-Core i7, 64G of 2400MHz DDR4 memory, Radeon Pro 580 GPU (8GB VRAM), 1TB PCIe based flash storage



    WHAT DID WE LEARN?
    If you are using your iMac 5K to edit video with DaVinci Resolve, you can get a big boost with 1080p playback with Noise Reduction by adding an eGPU with a secondary GPU. However, there is little to be gained with playback or export of RED 4K/5K video since the on-the-fly decoding of RED is CPU intensive.

    Did you notice that Resolve did playback and 'deliver' faster when we only used the iMac 5K's built-in display rather than the external Dell 5K display? On the other hand, you will find that with other apps, you must have the eGPU's graphics card directly connected to an external display before the external GPU(s) will be utilized.

    LuxMark results reveal the potential of apps that can use multiple GPUs to render OpenCL based projects. Ditto for Blender. And the only way to add a second or third GPU on your iMac 5K or MacBook Pro is with an eGPU box.

    The Blender test shows how one NVIDIA GPU rendering with CUDA is twice as fast as three AMD GPUs running OpenCL. And apps like Octane Render won't even function without CUDA capable GPUs.
     
  2. Jack Burton macrumors 6502

    Jack Burton

    Joined:
    Feb 27, 2015
    #2
    Yup, been following this one. Didn't post here since I feel like the eGPU folk like me are a small minority. I'm glad I could run two eGPUs. It may let me stay with the iMac.

    Although some apps will only work with an eGPU if that external box is also driving a monitor.
     
  3. iemcj macrumors 6502

    iemcj

    Joined:
    Oct 31, 2015
    #3
    This is good to know going forward. Would be cause to not need to buy a whole new imac a few years down the line when you can just add on a eGPU. Nice.
     

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