AMD EPYC Naples Memory Population Performance Impact

Discussion in 'STH Main Site Posts' started by Patrick Kennedy, Jul 31, 2018.

  1. #1
    eva2000 likes this.
  2. BackupProphet

    BackupProphet Well-Known Member

    Joined:
    Jul 2, 2014
    Messages:
    741
    Likes Received:
    258
    This is awesome stuff Patrick!
     
    #2
  3. BlackArchon

    BlackArchon Member

    Joined:
    Jun 23, 2016
    Messages:
    65
    Likes Received:
    10
    I really have hoped for a few more benchmarks. Also a configuration like two channels populated on die 1 and 3, and no RAM on dies 2 and 4 would be interesting. :)
     
    #3
  4. Patrick

    Patrick Administrator
    Staff Member

    Joined:
    Dec 21, 2010
    Messages:
    11,281
    Likes Received:
    4,238
    Data got repetitive after awhile and this takes quite a long time to generate since it requires physical access to the box to swap DIMMs.


    On the die 1 and 3 I am not sure why it is hard to extrapolate. Single to dual channel is essentially 4 to 8. Two die populated to four is 2 to 4.

    Perhaps when we publish the 32C results we will do more, but two dies with memory access is dumb.

    Also, there is an architectural reason you would never do this. If you are constantly accessing RAM over IF your PCIe bandwidth chokes die to die. You have more or less PCIe 3.0 x16 between each die with current IF. If you are doing PCIe transfer and RAM transfer on the same IF link, one has to suffer because there is not enough bandwidth.
     
    #4
    Blinky 42 and eva2000 like this.
  5. BlackArchon

    BlackArchon Member

    Joined:
    Jun 23, 2016
    Messages:
    65
    Likes Received:
    10
    I'm asking specifically for this configuration because it is rumored that this would be the memory configuration for Threadripper 2. If this is true (and not one channel per die), I'm interested in the performance impact. :)
     
    #5
  6. Patrick

    Patrick Administrator
    Staff Member

    Joined:
    Dec 21, 2010
    Messages:
    11,281
    Likes Received:
    4,238
    I know why people are asking. ;)
     
    #6
Similar Threads: EPYC Naples
Forum Title Date
STH Main Site Posts AMD EPYC is the New AMD Zen Based Server Brand for Naples May 16, 2017
STH Main Site Posts Gigabyte R271-Z00 2U 1P AMD EPYC Server Launched Monday at 8:53 PM
STH Main Site Posts Introducing the Ultra EPYC AMD Powered Sun Ultra 24 Workstation Sunday at 5:32 PM
STH Main Site Posts Gigabyte Racklution-OP AMD EPYC OCP Nodes Launched Jan 17, 2019
STH Main Site Posts How tariffs hurt Intel Xeon D Atom and AMD EPYC 3000 Dec 30, 2018

Share This Page