Adding memory to an R630

Question

We have a dual CPU R630 which was supplied with a total of 16 x 16 GB RDIMMs (2133 MT/s, dual rank, x4 data rate) factory-fitted for a total installed memory of 256 GB. These RDIMMs are in slots A1-8 and B1-8.

While it's possible to add another 8 x 16 GB memory modules of exactly the same spec in the 8 remaining green slots to give a total of 384 GB, is it possible to fit 8 x 32 GB RDIMMs instead of 16 GB RDIMMs, moving existing 16 GB modules from white slots A1-4 and B1-4 over to green slots A9-12 and B9-12 and fitting the 32 GB modules in the white slots? This ought to provide 52 GB of total memory.

Thanks in advance if this can be confirmed,

Andy

Daniel My · Accepted Answer

Hello Yes, you should be able to use 32GB RDIMMs with the 16GB RDIMMs. The best population would be: 1-4 32GB5-12 16GB Thanks

andyt22imp · Answer

Thank you very much for confirming this so promptly. We'll go this route and order the 32 GB RDIMMs. Thanks for your help (yet again!), Andy

jalopeno · Answer

I thought I read in the docs that if you mix different size RAM, the system will only run based on the size of the smallest unit? I.e. if you have 4x 16GB cards for 64GB then add 2 32GB cards, you will essentially be running 6x16GB RAM for 96GB instead of 128GB is that not correct? Or is it dependent on which slots they are in and that limitation is per cpu?

DELL-Charles R · Answer

Hello,

The general rule is if you mix Capacity; you need to put the largest size first in the memory channel and smaller after that.

When talking about speed for example: 1866 MT/s, 2133 MT/s or 2400 MT/s and you mix then the memory runs as the slowest DIMM speed in the system

R630 General memory module installation guidelines page 159

https://dell.to/3veFFzG

PowerEdge Hardware General

Adding memory to an R630

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