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
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   
Adding memory to an R630