Owners Manual

Table 24. Memory operating modes (continued)
Memory Operating Mode Description
With single rank memory sparing enabled, the system
memory available to the operating system is reduced by one
rank per channel.
For example, in a
dual-processor configuration with 24x 16 GB dual-rank memory
modules, the available system memory is: 3/4 (ranks/channel) ×
24 (memory modules) × 16 GB = 288 GB, and not 24 (memory
modules) × 16 GB = 384 GB. For multi rank sparing, the
multiplier changes to 1/2 (ranks/channel).
NOTE: To use memory sparing, this feature must be enabled in the BIOS menu of
System Setup.
NOTE: Memory sparing does not offer protection against a multi-bit uncorrectable
error.
Dell Fault Resilient Mode The Dell Fault Resilient Mode if enabled, the BIOS creates an area of memory that is
fault resilient. This mode can be used by an OS that supports the feature to load critical
applications or enables the OS kernel to maximize system availability.
NOTE: This feature is only supported in Gold and Platinum Intel processors.
NOTE: Memory configuration has to be of same size DIMM, speed, and rank.
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.
● Quad processor: Populate the slots in round robin sequence starting with processor 1.
NOTE: Processor 1, processor 2, processor 3, and processor 4 population should match.
Removing a memory module
The procedure for removing a DIMM module and an NVDIMM-N module is identical.
Prerequisites
1. Follow the safety guidelines listed in Safety instructions.
2. Follow the procedure listed in Before working inside your system.
3. If applicable, remove the air shroud
4. If applicable, remove the mid drive tray.
WARNING:
Allow the memory modules to cool after you power off the system. 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 in configurations with mid drive tray, 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.
NOTE: You must follow the thermal restriction while using DIMM blank. For information about thermal restriction, see the
Thermal restrictions section.
Installing and removing system components 85