Release Notes

11 Balanced Memory with 2
nd
Generation AMD EPYC
TM
Processors for PowerEdge Servers
5. Balanced Configurations (Recommended)
Balanced configurations satisfy NPS 0/1 conditions by requiring each memory channel
to be populated with one or two identical DIMMs. By doing this, one interleave set can
optimally distribute memory access requests across all the available DIMM slots;
therefore, maximizing performance. Memory controller logic was designed around fully
populated memory channels, so it should come as no surprise that eight or sixteen
populated DIMMs are recommended. Having eight DIMMs will reap the highest
memory bandwidth while having sixteen DIMMs will yield the highest memory capacity.
Figure 8: Eight DIMMs are populated in a balanced configuration, producing the highest memory
bandwidth while at a lower capacity than sixteen
Figure 9: Sixteen DIMMs are populated in a balanced configuration, producing the highest memory
capacity while at a lower bandwidth than eight