Hardware Owner's Manual

Installing Blade Components 173
General Memory Module Installation Guidelines – PowerEdge M915
To ensure optimal performance of your system, observe the following
guidelines when configuring your system memory:
CAUTION: Memory module blanks must be installed in unoccupied memory
sockets to maintain proper cooling airflow.
•Memory modules m ust be installed in pairs , beginning with the first two
sockets in each set of memory modules. These sockets are marked by white
retention levers.
• The memory configuration for each processor must be identical.
• Memory modules must be identical in size, speed, and technology in
lock
– step pair (same colored levers).
• If quad-rank memory modules are mixed with single- or dual-rank
modules, the quad-rank modules must be installed in the sockets with the
white release levers.
• If pairs of memory modules of different sizes are installed, the larger
capacity memory modules must be installed in the lower numbered slots.
• Memory sparing is supported in a four-processor system only if 32 memory
modules are installed.
• Memory sparing is supported in a two-processor system only if 16 memory
modules are installed.
Table 3-1. Examples of PowerEdge M915 Memory Configurations
NOTE: DIMMs A1-A8 are assigned to processor 1, DIMMs B1-B8 are assigned to
processor 2, and so on.
Total
Physical
Memory
Number of
Processors
Memory Modules –
Number and Type
Memory
Sparing
Support
Memory Module Locations
8 GB Two Eight 1 GB N A1, A2, A3, A4, B1, B2, B3, B4
16 GB Two Eight 2 GB N A1, A2, A3, A4, B1, B2, B3, B4
16 GB Four Sixteen 1 GB N A1, A2, A3, A4, B1, B2, B3,
B4, C1, C2, C3, C4, D1, D2,
D3, D4