Dell PowerEdge M620 Owner's Manual page 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 must 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 Number of
Physical Processors
Memory
8 GB Two
16 GB Two
16 GB Four
Memory Modules –
Number and Type
Eight 1 GB
Eight 2 GB
Sixteen 1 GB
Memory Memory Module Locations
Sparing
Support
N A1, A2, A3, A4, B1, B2, B3, B4
N A1, A2, A3, A4, B1, B2, B3, B4
N A1, A2, A3, A4, B1, B2, B3,
B4, C1, C2, C3, C4, D1, D2,
D3, D4
Installing Blade Components
173