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On page 48 in this user guide, it is explained in which order memory modules should be installed for an HP DL385 server with AMD Opteron CPUs.

There are 12 banks per CPU, and I have 6 x 4GB + 2 x 2GB modules for each CPU.

How should the chart be read for this complex case?


  • The 2GB modules are RDIMM and dual rank.
  • The 4GB modules are RDIMM and single rank.
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Which CPU sockets are filled? Is the memory SR, DR or QR? Which ones are UDIMMs and which ones are RDIMMs? – mailq Sep 6 '11 at 16:18
@mailq : I have now updated the post with the ram module specs. Does that change the ram socket order? – Sandra Sep 7 '11 at 10:19
up vote 1 down vote accepted


  • 4 GB in A (1)
  • 4 GB in B (7)
  • 4 GB in C (4)
  • 2 GB in D (10)
  • 4 GB in E (3)
  • 4 GB in F (9)
  • 4 GB in G (6)
  • 2 GB in H (12)

repeat with CPU 2

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Sorry but I'd put the 2GB modules in G and H myself, actually I'd leave them out altogether but that's beside the point. @Sandra, always look at the quickspecs, they have really clear loadout instructions towards the bottom. – Chopper3 Sep 6 '11 at 16:46
@Chopper3 G and H are not on the same memory channel. This is why I edited the answer. My first answer was equal to your comment. – mailq Sep 6 '11 at 17:05
I know, but that's the point, to balance them across channels, that's the most efficient way of doing it (sorry, I'm a HP tin geek :) ) – Chopper3 Sep 6 '11 at 17:25
Good to know where I can address my next HP questions... I keep my answer this way to not confuse with the comments. – mailq Sep 7 '11 at 7:23
Not really, it's the quad rank ones where things get interesting. – Chopper3 Sep 7 '11 at 10:53

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