DR4300 Owners Manual
Removing memory modules
81
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
This table describes the memory population and its 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 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
This section describes the memory configurations for a two processors.
System
capacity
(in GB)
DIMM
size (in
GB)
Number
of DIMMs
DIMM rank, organization, and
frequency
DIMM slot population
32
4
8
1R, x8, 2400 MT/s
1R, x8, 2133 MT/s
A1, A2, A3, A4, B1, B2, B3, B4
Removing memory modules
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.
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