  Yes, that sounds correct. You would need to swap out all memory with 32GB modules to increase the total memory since you are losing access to 4 slots due to quad rank memory. Thanks
Hi, I've R720 fully populated with 24x16 GB dual-rank RDIMMs = they have 384 GB total. I'd like to upgrade them to 512 GB, but apparently if quad-rank DIMM is installed, the last bank in channel has to remain empty. Is that correct?If yes, is it possible to have one channel per CPU populated with 2x32 GB DIMMs and all remaining channels populated with 16 GB ones?Or all 4 channel need to have exactly the same DIMM layout?
R720 - mixed memory configuration