HP rx5670 Hardware Installation Manual page 28

Installing Additional Components
Installing Processors and Memory
Installing Memory
Memory Load Order
DIMMs are installed on Memory Extender Boards located in the Top Service Bay. A minimum of one Memory
Extender Board is required. A maximum of two Memory Extender Boards may be installed per system. Each
Memory Extender Board can hold up to 24 DIMMs.
Memory must be installed in groups of four identical DIMMs. For a minimally loaded system, DIMMs will be
loaded in slots 0A, 0B, 0C and 0D. This collection of slots is referred to as Rank 0. The next set of DIMMs
loaded are installed into slots 1A, 1B 1C and 1D. The process of loading additional DIMMs continues in a
similar manner through the last set of DIMMs, which is installed in slots 5A, 5B, 5C, and 5D.
Memory Performance Considerations
For best memory performance, install a second Memory Extender Board and distribute DIMM installation
between them. Memory performance increases as the difference in memory installed between Memory Board
Extenders is decreased. Optimal memory performance is obtained when the differential is 0. Memory
performance will also be increased by loading the highest capacity DIMMs in the lower ranks.
Removing a Memory Extender Board
To remove a Memory Extender Board, perform the following steps:
1. Press the latch on the extraction levers located on each side of the Memory Extender Board.
2. Pull up on the extraction levers to free the Memory Extender Board from the socket located on the System
Baseboard.
Figure 2-8 Memory Extender Board
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Chapter 2