Hardware options installation 53
• For the server to support Mirrored Memory, all processors must have a valid mirroring configuration.
• The minimum allowable configuration is two memory cartridges per processor.
• Both memory cartridges for each processor must be populated with identical DIMM configurations.
• Both memory risers inside the memory cartridge must be populated identically. Following general
DIMM slot population guidelines accomplishes this if DIMMs are installed in pairs in each cartridge.
Achieving optimum memory performance
The server includes 96 DIMM slots across four multi-core processors. While there are multiple DIMM
population configurations that might provide an ideal memory size, you can only achieve optimal
performance when populating DIMMs that can take advantage of the Intel Xeon Processor E7 series
architecture.
For optimum performance, Hewlett Packard Enterprise recommends the following practices (listed in
order of significance for memory performance):
• Use both memory controllers inside the processor and populate two memory cartridges for each
installed processor.
• Populate each DDR4 channel in each memory cartridge. To achieve this, the minimum DIMM count
per cartridge is four DIMMs installed.
• Populate DIMMs in cartridges identically across all processors.
• RDIMMs have lower latency, LRDIMMs have higher capacity.
Installing a DIMM
To determine the ideal Memory RAS features for your setup, see "DIMM population guidelines for
memory modes."
WARNING: Use caution when installing or removing the processor memory drawer. The
processor memory drawer is very heavy when fully populated.
To install the component:
1. Power down the server (on page 24).
2. Remove all power:
a. Disconnect each power cord from the power source.
b. Disconnect each power cord from the server.
3. Remove the processor memory drawer shipping screws, if installed. Retain the screws for future use
("Processor memory drawer shipping screw locations" on page 30).
4. Remove the processor memory drawer (on page 31).
5. Remove the processor memory drawer cover (on page 32).
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