I just wanted to sanity check this against my understanding of memory DIMM configuration for my Dell r710.
I have currently got installed 8 x 16GB DIMMs (Hynix HMT42GR7BMR4C-G7).
I purchased an additional 8 x 16GB DIMMs (Hynix HMT42GR7BMR4A-G7).
I was hoping to make use of all 16 DIMMs to achieve a total of 256GB usable memory (this is for a nested vSphere environment). However, after several attempts to find a working configuration/placement of DIMMs I have come to believe that I am unable to make use of the 3rd slot in each channel due to the first 2 DIMMs (one from each model mentioned above) being quad rank.
Each channel can only support 8 ranks.
Am I correct in thinking that due to this limitation I can only populate 2 of the 3 DIMM slots in each channel? Thus 32GB per channel, 3 channels per CPU (total of 96GB), giving a total usable value of 192GB?
Is it possible to find DIMMs with lower ranks? ie 16GB DIMMs with only dual rank or something like that so I could make 256GB from 16GB DIMMs?