Removing A Memory Module - Dell EMC PowerEdge XE7420 Installation And Service Manual

Table 8. Memory operating modes (continued)
Memory Operating Mode
Optimizer Mode
This mode supports Single Device Data Correction (SDDC) only for memory modules that use x4 device width. It does not
impose any specific slot population requirements.
● Dual processor: Populate the slots in round robin sequence starting with processor 1.
NOTE: Processor 1 and processor 2 population should match.
Table 9. Memory population rules
Processor Configuration
Single processor Optimizer (Independent
channel) population order
Mirror population order
Single rank sparing population
order
Multi rank sparing population
order
Fault resilient population order
Dual processor (Start Optimized (Independent
with processor1. channel) population order
processor1 and
Mirroring population order
processor 2
population should
match)
Single rank sparing population
order
Multi rank spare population
order
Fault resilient population order

Removing a memory module

Prerequisites
1. Follow the safety guidelines listed in the
2. Follow the procedure listed in the
3. Remove the sled.
4. Remove the air shroud.
WARNING: The memory modules are hot to touch for some time after the system has been powered off. Allow
the memory modules to cool before handling them.
80 Installing and removing system components
Memory population
1, 2, 4, 5
{1, 2, 3, 4, 5, 6}
1, 2, 3, 4, 5, 6, 7, 8
1, 2, 3, 4, 5, 6, 7, 8
{1, 2, 3, 4, 5, 6}
A{1}, B{1}, A{2}, B{2}, A{4},
B{4}, A{5}, B{5}
A{1,2,3,4,5,6},
B{1,2,3,4,5,6}
A{1}, B{1}, A{2}, B{2}, A{3},
B{3}...
A{1}, B{1}, A{2}, B{2}, A{3},
B{3}...
A{1,2,3,4,5,6},
B{1,2,3,4,5,6}
Safety instructions.
Before working inside your
Description
NOTE: Memory configuration has to be of same size
DIMM, speed, and rank.
system.
Memory population information
Odd amount of DIMMs per
processor allowed.
Mirroring is supported with 6
DIMMs per processor
Populate in this order, odd amount
per processor allowed. Requires
two ranks or more per channel.
Populate in this order, odd amount
per processor allowed. Requires
three ranks or more per channel.
Supported with 6 DIMMs per
processor.
Odd amount of DIMMs per
processor allowed.
Mirroring is supported with 6
DIMMs per processor.
Populate in this order, odd amount
per processor allowed. Requires
two ranks or more per channel.
Populate in this order, odd amount
per processor allowed. Requires
three ranks or more per channel.
Supported with 6 DIMMs per
processor.