I'm trying to install memory into a Dell R610 server, and am honestly at wit's end.

The DIMMS I have are:

  • 4 x 4GB DDR3
  • 2 x 8GB DDR3

I tried putting in the 4 x 4GB sticks in A1, A2, B1, B2 and the 2 x 8GB sticks in A3, B3 - but it complained:

The following DIMMS should match in size and geometry: DIMM A1, A2 & A3

I then tried putting in the 4 x 4GB sticks all on one CPU - A1, A2, A3 and A4. With the 2 x 8GB sticks on B1, B2.

However, it then complained about:

The memory configuration is not optimal.


DIMM configuration on each CPU should match.

I tried to follow the guide at http://www.dell.com/downloads/global/products/pedge/en/server-pedge-installing-upgrading-memory-11g.pdf, but couldn't seem to get it optimal.

Does anybody know what configuration I should be using?

  • AFAIK,there is simply no way to get the system to be happy with 6 sticks. You need 2, 4 or 8. You could probably get rid of a pair 4GB sticks, and have 2x4GB, and 2 8GB. Or the other option is to buy another pair of 8GB sticks. Not adding this as an 'answer', since I don't have the refs/manuals handy, just going of what I vaguely remember. – Zoredache Apr 11 '18 at 19:08

The 610 has got three RAM channels, so A1, A2, A3 should have the same module size & type, and B1, B2, B3 should have the same module size & type.

Single CPU:

With 4 + 2 modules, there's no optimal layout.

The best solution is to replace one of the 4 GB DIMMs with a 8 GB DIMM, so you get two matching triplets.

Dual CPUs:

Plug 8 + 4 + 4 GB into each CPU's sockets, one DIMM per channel.

  • I tried this last night - 8GB sticks in A1, and B1, and then the 4GB sticks in A2, A3, B2, B3. Unfortunately, it still gave me an error about non-optimal configuration. i.imgur.com/eQZO6RG.jpg – victorhooi Apr 22 '18 at 22:17
  • Reread the answer - A/B is the DIMM number while 1/2/3 is the channel. Without buying another 8 GB stick, put 8GB in A1/A2 and the 4GB in B1/B2/B3. The last 4GB is spare. If you buy another (matching) 8GB stick put it in A3. – Zac67 Apr 23 '18 at 17:05

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