Amfeltec PCI Express Splitter

Discussion in 'Mac Pro' started by nbritton, Jan 16, 2017.

  1. nbritton macrumors regular

    Joined:
    May 22, 2008
    #1
  2. William_si macrumors regular

    William_si

    Joined:
    Apr 4, 2016
    Location:
    Croatia
    #2
    I have this one:

    http://amfeltec.com/products/flexible-x4-pci-express-4-way-splitter-gpu-oriented/

    Which should be the same PLX chip.

    It works fine in slot 3/4 on my 4,1/5,1 (see usage here, external GPUs), the ones expanding 1 lane to 3 lanes (eg. this one - i had a POC visible here which did not work in a Mac Pro but fine in another system) are very hit or miss, especially the PCIe 1.0/1.1 based ones.

    If you want to inquiry pricing with Amfeltec.... not cheap. 250$+ for mine.


    If you can get mini PCIe actual PCIe (so not mSATA which is the same slot and not compatible) SSDs with any reasonable speed (x1 2.0 effectively cuts at 450MB/s anyway, but this tech is old sooooo... either rare and not cheap or slow) or can convert them to m.2 (exists, but you connect an x4 SSD to x1 one then and pay that premium) your plan works and is faster than the SATA2 based bays.

    Keep in mind you share the x4 in slot 3 with slot 4 by another PLX chip and that RAID volumes booted from cannot be Filevault encrypted.
     
  3. cmabolt macrumors newbie

    Joined:
    Jan 11, 2018
    #3
    Hi William, We are specking a systems for a 2012 5.1 mac using it's 2 x16 PCIe slots. We're hoping to use 4 GPU's on each slot with amfeltec's cluster solutions. I'm reading that the mac will only work with 4 gpu's period? Any thought on how to configure this.

    Thanks Chris
     
  4. AidenShaw macrumors P6

    AidenShaw

    Joined:
    Feb 8, 2003
    Location:
    The Peninsula
    #4
    Investigate companies like OneStopSystems (https://www.onestopsystems.com/3u-compute-accelerator-nvidia-tesla-gpus) which specialize in making external PCIe expansion chassis - up to 16 GPU.

    3u_tesla[1].png

    These come with PCIe x16 cards that have a connector to the chassis. For many applications, splitting an x16 slot to eight x16 GPUs is reasonable.

    Amfeltec is kind of an amateur in this market.
     

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