Sample Memory Configurations; Removing Memory Modules - Dell E31S Series Owner's Manual

NOTE: Both Advanced ECC/Lockstep and Optimizer modes support memory sparing.
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.
• Memory modules installed in memory module sockets with white release levers must be identical and the same rule applies for sockets
with black and green release tabs. This ensures that identical memory modules are installed in matched pairs—for example, A1 with A2,
A3 with A4, A5 with A6, and so on.
Table 31. Processor configuration
Processor Configuration
Single CPU Memory population order

Sample memory configurations

The following table shows sample memory configurations for two processor configuration that follows the appropriate memory guidelines.
NOTE: 1R and 2R in the following table indicates single and dual ranks DIMMs respectively.
Table 32. Sample Memory configurations
System DIMM size
capacity (in (in GB)
GB)
128 8
16

Removing memory modules

Prerequisites
CAUTION: Many repairs may only be done by a certified service technician. You should only perform troubleshooting and
simple repairs as authorized in your product documentation, or as directed by the online or telephone service and
support team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. Read and follow
the safety instructions that are shipped with your product.
1. Follow the safety guidelines listed in the Safety instructions section.
2. Follow the procedure listed in the Before working inside your system section.
3. Remove the cooling shroud.
4. If installed, remove the cooling fan assembly. For more information, see the Removing the cooling fan assembly section.
NOTE: The memory modules are hot to touch for some time after the system has been powered down. Allow the
memory modules to cool before handling them. Handle the memory modules by the card edges and avoid touching the
components or metallic contacts on the memory module.
CAUTION: To ensure proper system 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.
Number of DIMM rank, organization, and
DIMMs frequency
16
1R, x8, 2400 MT/s
1R, x8, 2133 MT/s
8
2R, x8, 2400 MT/s
2R, x8, 2133 MT/s
Memory population rules
{1,2}, {3,4}
Installing and removing system components
Memory population information
See Memory mirroring note
DIMM slot population
A1, A2, A3, A4, A5, A6, A7, A8, B1, B2, B3,
B4, B5, B6, B7, B8
A1, A2, A3, A4, B1, B2, B3, B4
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