Hello Yes, you can fully populate with single rank memory. Quad rank memory is the only rank that has population limits, 1R and 2R will not limit the amount of memory that can be populated. Thanks
  I want to add more ram to my r620 which currently has 32gb of ram (4 x 8gb). 8GB Samsung PC3L-12800R DDR3L 1600 1Rx4 M393B1G70BH0-YK0 Looking at the the ram configuration based on the service tag it does not list 1r ranks beyond 24gb configuration. I have dual cpus. Question: can I just add more of the 1r 8gb dimms or do I have to step up to 2r dimms? I was going order enough of the same memory I currently have to max out my ram compacity.
Dell R620 memory upgrade