Owners Manual

Table 11. Memory population rules (continued)
Processor Configuration Memory population Memory population information
A1, A2, A4, A5, A7, A8, A10, A11,
B1, B2, B4, B5, B7, B8, B10, B11
C1, C2, C4, C5, C7, C8, C10, C11
D1, D2, D4, D5, D7, D8, D10, D11
Mirroring population
order
A{1, 2, 3, 4, 5, 6},
B{1, 2, 3, 4, 5, 6},
C{1, 2, 3, 4, 5, 6},
D{1, 2, 3, 4, 5, 6}
A{7, 8, 9, 10, 11, 12},
B{7, 8, 9, 10, 11, 12},
C{7, 8, 9, 10, 11, 12},
D{7, 8, 9, 10, 11, 12}
Mirroring is supported with 6 or 12 DIMM slots
per processor.
Single rank sparing
population order
A{1}, B{1}, C{1}, D{1},
A{2}, B{2}, C{2}, D{2},
A{3}, B{3}, C{3}, D{3},
A{4}, B{4}, C{4}, D{4}
● DIMMs must be populated in the order
specified.
● Requires two ranks or more per channel.
Multi rank spare
population order
A{1}, B{1}, C{1}, D{1},
A{2}, B{2}, C{2}, D{2},
A{3}, B{3}, C{3}, D{3},
A{4}, B{4}, C{4}, D{4}
● DIMMs must be populated in the order
specified.
● Requires three ranks or more per channel.
Fault resilient population
order
A{1, 2, 3, 4, 5, 6},
B{1, 2, 3, 4, 5, 6},
C{1, 2, 3, 4, 5, 6},
D{1, 2, 3, 4, 5, 6}
A{7, 8, 9, 10, 11, 12},
B{7, 8, 9, 10, 11, 12},
C{7, 8, 9, 10, 11, 12},
D{7, 8, 9, 10, 11, 12}
Supported with 6 or 12 DIMM slots per
processor.
Removing a memory module
Prerequisites
1. Follow the safety guidelines listed in the Safety instructions section.
2. Follow the procedure listed in the Before working inside your sled section.
3. For removing the memory module on the PEM, remove the air shroud from the PEM.
4. For removing the memory module on the system board,
a. Remove the PEM.
b. Remove the air shroud on the system board.
WARNING:
Allow the memory modules to cool after you power off the sled. Handle the memory modules by the
card edges and avoid touching the components or metallic contacts on the memory module.
CAUTION: To ensure proper sled cooling, memory module blanks must be installed in any memory socket that is
not occupied. Remove memory module blanks only if you intend to install memory modules in those sockets.
NOTE: You must follow the thermal restriction while using DIMM blank. For information about thermal restriction, see the
PowerEdge MX840c Technical Specs at www.dell.com/poweredgemanuals
Steps
1. Locate the appropriate memory module socket.
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Installing and removing sled components