Hardware options installation 46
• In automatic mode, the BIOS enables Hemisphere mode if the system memory configuration is
compatible with Hemisphere mode.
• Hemisphere mode should produce the best overall performance for a variety of applications.
However, Hemisphere mode can be disabled if it produces lower performance for a particular
application.
• To enable each processor to enter Hemisphere mode, both memory cartridges must be installed and
populated with equal memory capacities based on the DIMM installation guidelines (on page 42).
• Greater performance is obtained when all cartridges are populated with either four or eight dual- or
quad-rank DIMMs.
• Mirrored Memory mode is not supported when Hemisphere mode is enabled.
The following illustration shows examples of Hemisphere mode and non-Hemisphere mode populations.
The two non-Hemisphere examples show the following:
• Each memory controller must have a cartridge installed.
• The DIMM configurations of each cartridge connected to controller 1 and 2 of a processor must be
identical.
Example 4 is a Hemisphere mode configuration as the two cartridges connected to each processor are
configured identically, even though cartridges 1 and 2 are not identical to cartridges 3 and 4.
Memory performance optimization
The HP ProLiant DL580 G7 Server supports 64 DIMMs across four multi-core processors. While there are
many DIMM population configurations that can support any total memory size, optimal performance is
achieved when populated DIMMs can take advantage of the Intel® Xeon™ 7500-series processor
architecture.
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