HP ProLiant BL680c G7 Server-Blade - Manual (Page 53)

Hardware options installation 53
The following illustration shows examples of Hemisphere mode and non-Hemisphere mode populations.
The two non-Hemisphere examples show the following:
• Each memory controller within a processor must have memory installed.
• The DIMM configurations of each memory controller of a processor must be identical.
Memory performance optimization
The HP ProLiant BL680c G7 Server Blade supports up to 64 DIMMs installed on four multi-core processors.
Optimal performance is achieved when the DIMMs are populated to make best use of the Intel® Xeon® E7
family and 7500 series processor architectures.
To achieve the best performance for a given memory processor configuration, observe the following
guidelines:
• The largest contributor to maximum memory bandwidth performance is to use both memory controllers
that are integrated in each processor. To achieve maximum memory bandwidth performance, populate
both memory controllers for each installed processor.
• The second largest contributor to performance is to populate each DDR3 channel for each installed
processor. To achieve this, the minimum recommended DIMM count is eight DIMMs installed in DIMM
pair locations A, B, C, and D on each installed processor.
• The third largest contributor to memory subsystem performance is the number of ranks per DIMM.
Dual-rank DIMMs perform well, but quad-rank DIMMs offer a further performance boost.