Threadripper, PCI Express, and multiple GPUs

Discussion in 'AMD MoBos' started by Quartz-1, Aug 13, 2017.

  1. Quartz-1

    Quartz-1 [H]ardness Supreme

    Messages:
    4,237
    Joined:
    May 20, 2011
    One of the plus points of Threadripper - and Epyc - is the number of PCI Express lanes. I would like to see [H] test the effect of this with multiple GPUs, both Radeon and Geforce, in 2, 3, and 4 card configurations. I suspect that there will be a modest difference but I'd like actual numbers.
     
  2. Kyle_Bennett

    Kyle_Bennett El Chingón Staff Member

    Messages:
    45,899
    Joined:
    May 18, 1997
    I doubt we will be spending resources on that. Assuming you are talking about gaming?
     
  3. Quartz-1

    Quartz-1 [H]ardness Supreme

    Messages:
    4,237
    Joined:
    May 20, 2011
  4. Quartz-1

    Quartz-1 [H]ardness Supreme

    Messages:
    4,237
    Joined:
    May 20, 2011
    Oh well, perhaps something to keep on file for such time as you do have the resources.
     
  5. Master_shake_

    Master_shake_ 2[H]4U

    Messages:
    2,434
    Joined:
    Apr 9, 2012
    Sli and crossfire have really bad returns with anything over 2 cards and in some situations more than one.
     
  6. Quartz-1

    Quartz-1 [H]ardness Supreme

    Messages:
    4,237
    Joined:
    May 20, 2011
    And I wonder how much that is to do with the paucity of PCI Express lanes. Threadripper should be able to grant a full 16 lanes to each of three GPUs and Epyc 16 lanes to all four.
     
  7. Living Weapon

    Living Weapon Limp Gawd

    Messages:
    434
    Joined:
    Dec 21, 2007
    Old games run fine on a single 1070

    Current games are not produced to take advantage of SLI

    If you need all the GPUs for mining, genomics, AI, whatever R&D - a PCIe switch backplane + cheap host CPU w/IPMI is a better option (or Cloud if the utilization/economics make sense)

    64 lanes are great future-proofing for a platform architecture that will last 5+ years, but in a server purchased today they are a solution looking for a problem
     
  8. tangoseal

    tangoseal [H]ardness Supreme

    Messages:
    5,044
    Joined:
    Dec 18, 2010
    All current x399 boards are 16 8 16 8
     
    Quartz-1 likes this.
  9. Quartz-1

    Quartz-1 [H]ardness Supreme

    Messages:
    4,237
    Joined:
    May 20, 2011
    That's disappointing.
     
  10. rgMekanic

    rgMekanic [H]ard|News Staff Member

    Messages:
    2,599
    Joined:
    May 13, 2013
  11. KazeoHin

    KazeoHin [H]ardness Supreme

    Messages:
    6,415
    Joined:
    Sep 7, 2011
    This would only be for convenience of features. Take for instance, seing PCI-E slots dissabled due to another slot or an M2 slot in use, or lack of second or third M.2 slots, lack of sata ports.. etc..

    You can't really benchmark that. Its a feature advantage, not a performance advantage