DIMM Insertion

• GS

  Gonzalo Samper

  5/8/23, 3:53 AM

  Hi,

  I am getting one AADK 80 core. If I only have one DIMM, which slot in the below photo should I insert?

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  Ruler of COM Staff member

  5/11/23, 7:51 AM

  Important question

  First of all every DIMM socket has its own unique controller. In case of a single DIMM you can use it in any of the 6 slots, but for 2 or more its is not that straightforward.
  
  on this page we show how it works out for every possible combination : https://www.ipi.wiki/pages/comhpc-docs?page=HowToUseDimms.html

  Regarding what DIMMs to use, there is a public AVL (approved vendor list) for the Ampere Altra SOC.
  Altough we (ADLINK / I-Pi) did not test every one of them we see no issue to follow this list for the memory part.
  
  ONE WARNING :  we only support DIMMs smaller or equal to 64 GB, this has to do to a power input limitation of the COM HPC module we use in this design. 

  You can read about COM HPC here : https://www.picmg.org/openstandards/com-hpc/

  For the Ampere Altra AVL, find the document here :  https://amperecomputing.com/customer-connect/products/altra-family-device-documentation

   

   

   

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• 

  Rebecca Cran

  5/21/23, 5:15 PM

  @Ruler of COM I see there's also a Memory Support AVL at https://www.ipi.wiki/pages/aadk-docs?page=MemorySupportAVL.html which is substantially smaller than the one on the amperecomputing.com site.

  Is that one list specifically for industrial/embedded uses? I noticed they're generally designed to withstand a higher temperature range: for example the Transcend TS4GHR72V2EL is listed as a:

  "Registered DIMMs with Wide Temperature (-40°~95ºC) functionality to withstand harsh environmental conditions."

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• 

  Ruler of COM Staff member

  5/22/23, 6:07 AM

  Rebecca, the list on the ipi.wiki site reflects all the memory that ADLINK tested so far. That is way less than what is on the AVL list of Ampere of course. Memory support is kind of straight forward, it does not really depend on BIOS / edk2 or OS level support. So we are confident to say what Ampere has on its AVL list will also work on our AADKs and AADPs.
  
  Concerning our own list  https://www.ipi.wiki/pages/aadk-docs?page=MemorySupportAVL.html
  I will asks to add for what temperatures these DIMMs are qualified to avoid everyone has to look it up

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  Rebecca Cran

  5/22/23, 1:30 PM

  @Ruler of COM Thanks! Could you provide a link from the wiki page to Ampere's AVL please?

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