The example page doesnt cover every possible configuration. Install all the 32G dimms first in slots A1-A6, then the 16G dimms in A7-A10. #Iwork4Dell  
Hi everyone, I have a PowerEdge Dell R730 server with 64GB RAm (4x16GB 2133) and I'm wanting to go up to 256GB. The server has a single Intel Xeon E5-2630 v3 2.4GHz processor, 2 0M Cache, 8.00GT / s QPI, Turbo, HT, 8C / 16T (85W). Can you configure the memories with 4x16Gb and 6x32GB to reach 256GB?. I have not found a memory configurator tool for DELL. Just the configuration examples. [URL]
Need upgrade Memory RAM Dell R730 64GB to 256GB One Processor