Amfeltec PCI Express Splitter

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

  1. nbritton macrumors regular

    May 22, 2008
  2. William_si macrumors regular


    Apr 4, 2016
    I have this one:

    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

    Jan 11, 2018
    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


    Feb 8, 2003
    The Peninsula
    Investigate companies like OneStopSystems ( which specialize in making external PCIe expansion chassis - up to 16 GPU.


    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.

Share This Page