Owners Manual

NOTE: Advanced ECC with mirroring is not supported.
Memory optimized (independent channel) 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.
Table 26. Memory optimized (independent channel) mode
Processor Configuration Memory population rules Memory population
information
Single CPU
NOTE: Optimized mode permits
unbalanced configurations, eg, 1:1:1:0 DIMM
per channel (DPC) combinations.
Optimized
(independent channel)
1, 2, 3, 4 Populate in this order,
odd amount of DIMMs
per CPU allowed.
Dual CPU
NOTE: Populate round robin starting with
CPU1:
NOTE: Optimized mode permits
unbalanced configurations, eg, 2:1:1:1 DPC
combinations.
Optimized
(independent channel)
C1{1}, C2{1}, C1{2}, C2{2},
C1{3}, C2{3}…
Populate in this order,
odd amount of DIMMs
per CPU allowed.
Memory mirroring
Memory mirroring offers the strongest memory module reliability mode compared to all other modes, providing improved
uncorrectable multi-bit failure protection. In a mirrored configuration, the total available system memory is one half of the total
installed physical memory. Half of the installed memory is used to mirror the active memory modules. In the event of an
uncorrectable error, the system switches over to the mirrored copy. This ensures SDDC and multi-bit protection.
The installation guidelines for memory modules are as follows:
● Memory modules must be identical in size, speed, and technology.
● DIMMs installed in memory sockets with white release tabs must be identical and similar rule applies for sockets with black
release tabs. This ensures that identical DIMMs are installed in matched pairs—for example, A1 with A2, A3 with A4.
NOTE:
Mirroring and Advanced ECC modes require minimum of two DIMMs per CPU and must be populated in pairs of
either two or four DIMMs per CPU.
Table 27. Processor configuration
Processor Configuration Memory population rules Memory population information
Single CPU Memory population order {1,2}, {3,4} See Memory mirroring note
Sample memory configurations
The following tables show sample memory configurations that follow the appropriate memory guidelines stated in this section.
NOTE: 1R, 2R, and 4R in the following tables indicate single rank, dual rank, and quad rank DIMMs respectively.
Table 28. Memory configurations—single processor
System Capacity
(in GB)
DIMM Size (in
GB)
Number of
DIMMs
Organization and
Speed
DIMM Slot Population
4 4 1
1R x8, 2400 MT/s
A1
8 4 2
1R x8, 2400 MT/s
A1, A2
8 8 1
1R x8, 2400 MT/s
A1
58 Installing and removing sled components