Owners Manual
Table Of Contents
- Dell EMC PowerEdge R940xa Installation and Service Manual
- About this document
- PowerEdge R940xa system overview
- Initial system setup and configuration
- Installing and removing system components
- Safety instructions
- Before working inside your system
- After working inside your system
- Recommended tools
- Front bezel
- Drives
- System cover
- Support bar
- Cooling fans
- Cooling fan assembly
- Optional USB 3.0 module
- Optional optical drive
- Control panel
- Air shroud
- NVDIMM-N battery
- Drive backplane
- System memory
- Processors and heat sinks
- Expansion cards and expansion card risers
- Expansion card installation guidelines
- Removing the expansion card riser
- Installing the expansion card riser
- Removing the expansion card from the riser
- Installing the expansion card in the riser
- Removing the expansion card from the system board
- Installing the expansion card on the system board
- GPU card installation guidelines
- Removing the GPU
- Installing the GPU
- M.2 SSD module
- Optional IDSDM or vFlash module
- Network daughter card
- System battery
- Optional internal USB memory key
- Power supply units
- Power interposer board
- Trusted Platform Module
- System board
- Jumpers and connectors
- System diagnostics and indicator codes
- Getting help
- Documentation resources
Table 11. Memory population rules (continued)
Processor Configuration Memory population Memory population information
channels identically with identical DIMMs
for best performance.
NOTE: For best performance, 6 DIMMs or
12 DIMMs per processor is recommended.
Optimizer population order is not traditional for
8 and 16 DIMMs installations for dual processor.
● For 8 DIMMs: A1, A2, A4, A5, B1, B2, B4, B5
● For 16 DIMMs:
A1, A2, A4, A5, A7, A8, A10, A11
B1, B2, B4, B5, B7, B8, B10, B11
Mirroring population
order
A{1, 2, 3, 4, 5, 6},
B{1, 2, 3, 4, 5, 6},
A{7, 8, 9, 10, 11, 12},
B{7, 8, 9, 10, 11, 12}
Mirroring is supported with 6 or 12 DIMMs per
processor.
Single rank sparing
population order
A{1}, B{1},
A{2}, B{2},
A{3}, B{3},
A{4}, B{4},
A{5}, B{5},
A{6}, B{6}
● DIMMs must be populated in the order
specified.
● Requires two ranks or more per channel.
Multi rank sparing
population order
A{1}, B{1},
A{2}, B{2},
A{3}, B{3},
A{4}, B{4},
A{5}, B{5},
A{6}, B{6}
● 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},
A{7, 8, 9, 10, 11, 12},
B{7, 8, 9, 10, 11, 12}
Supported with 6 or 12 DIMMs per processor.
Quad processor
(Starting with
processor 1,
and processor
1, processor 2,
processor 3,
and processor 4
population should
match)
Optimized population
order (Independent
channel)
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}
Odd number of DIMM population per processor
is allowed.
NOTE: Odd number of DIMMs will result in
unbalanced memory configurations, which
in turn will result in performance loss. It
is recommended to populate all memory
channels identically with identical DIMMs
for best performance.
NOTE: For best performance, 6 DIMMs or
12 DIMMs per processor is recommended.
Optimizer population order is not traditional
for 16 and 32 DIMMs installations for dual
processor.
● For 16 DIMMs:
A1, A2, A4, A5, B1, B2, B4, B5,
C1, C2, C4, C5, D1, D2, D4, D5
● For 32 DIMMs:
78 Installing and removing system components