Sample Memory Configurations - Dell PowerEdge M630 Owner's Manual

• Memory modules must be identical in size, speed, and technology.
• DIMMs installed in memorysockets with white release levers must be identical and the same rule applies for sockets with black
release levers. This ensures that identical DIMMs are installed in matched pair —for example, A1 with A2, A3 with A4, A5 with A6,
and so on.
Memory optimized (independent channel) mode
This mode supports Single Device Data Correction (SDDC) only for memory modules that usex4 device width. It does not impose
any specific slot population requirements.
Memory sparing
NOTE: Touse memory sparing, this feature must be enabled in System Setup.
In this mode, onerank per channel is reserved as aspare. If persistent correctable errors are detected onarank, the data from this
rank iscopied to the spare rank, and the failed rank is disabled.
With memory sparing enabled, the system memory available to the operating system is reduced byonerank per channel. For
example, in a dual-processor configuration with sixteen 4 GB single-rank memory modules, the available system memory is: 3/4
(ranks/channel) × 16 (memory modules) × 4 GB = 48 GB, and not 16 (memory modules) × 4 GB = 64 GB.
NOTE: Memory sparing does not offer protection against a multi-bit uncorrectable error.
NOTE: Both Advanced ECC/Lockstepand Optimizermodessupportmemorysparing.
Memory mirroring
Memory mirroring offers the strongest memory module reliability mode compared to all other modes, providing improved
uncorrectable multi-bit failure protection. In amirrored 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.
• Memorymodulesinstalledinmemorymodulesockets with whitereleaseleversmustbeidenticalandthesameruleappliesfor
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 23. Processor configuration
Processor
Configuration
Single CPU Memory population order

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-, dual-, and quad-rank DIMMs respectively.
NOTE: When using an 86 mm wide heat sink for single processor, the memory module sockets A10 and A12 are not
available for population.
Table 24. Memory configurations – single processor
System Capacity (in DIMM Size (in
GB) GB)
16 4
Memory population rules
{1,2}, {3,4}
Number of Organization and
DIMMs Speed
1R x8, 2133 MT/s
4
1R x8, 2400 MT/s
Memory population information
See Memory mirroring note
DIMM Slot Population
A1, A2, A3, A4
65