Configuring and using DDR3 memory with HP ProLiant Gen8 Servers

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Rules for DIMM types
• Do not mix UDIMMs, RDIMMs, or LRDIMMs.
• Quad rank RDIMMs are not supported in ProLiant Gen8 servers.
• LRDIMMs are capable of up to three DIMMs per channel.
• RDIMMs operating at either 1.35V or 1.5V may be mixed in any order, but the system will operate at the higher
voltage.
• DIMMs of different speeds may be mixed in any order. The server will select the lowest common speed.
General rules
• The maximum memory speed is a function of the memory type, memory configuration, processor model, and settings
in ROM BIOS.
• The maximum memory capacity is a function of the memory type and number of installed processors.
• To realize the performance memory capabilities listed in this document, HP SmartMemory is required.
DIMM Population Order
Figure 4 shows the memory slot configuration for 24-slot 2P ProLiant DL380p Gen8 server. In this drawing, the first
memory slots for each channel on each processor are the white memory slots (A, B, C, and D).
Figure 4. DIMM slots and population order for 24 slot 2P ProLiant Gen8 servers.
In general, memory population order follows the same logic for all ProLiant servers - although the processors may not
be located with a different physical arrangement relative to each other in some servers. To populate the server memory
in the correct order, you should use the following rules:
• When a single processor is installed in the system, install DIMMs in sequential alphabetical order – A, B, C, D… and so
on.
• When 2 processors are installed in the server, install DIMMs in sequential alphabetical order – P1-A, P2-A, P1-B, P2-
B… and so on.
• Within a given channel, you should populate DIMMs from the heaviest electrical load (dual-rank) to the lightest load
(single-rank).