Dell PowerEdge T640 EMC PowerEdge T640 Installation and Service Manual - Page 113

Optimizer Mode, Table 39. Memory operating modes continued, Table 40. Memory population rules

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Table 39. Memory operating modes (continued) Memory Operating Mode Dell Fault Resilient Mode Description 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. 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. Table 40. Memory population rules Processor Configuration Single processor Optimizer (Independent channel) population order Mirror population order Single rank sparing population order Multi rank sparing population order Memory population Memory population information 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, • 12 • • DIMMs must be populated in the order specified. Odd number of DIMM population is allowed NOTE: Odd number of DIMMs will result in unbalanced memory configurations, which in turn will result in performance loss. It is recommended to populate all memory channels identically with identical DIMMs for best performance. Optimizer population order is not traditional for 4 and 8 DIMM installations of single processor. ○ For 4 DIMMs: A1, A2, A4, A5 ○ For 8 DIMMs: A1, A2, A4, A5, A7, A8, A10, A11 {1, 2, 3, 4, 5, 6} {7, 8, 9, 10, Mirroring is supported with 6 or 12 DIMMs per 11, 12} processor. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, • 12 • DIMMs must be populated in the order specified. Requires two ranks or more per channel. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, • DIMMs must be populated in the order 12 specified. Installing and removing system components 113

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Table 39. Memory operating modes (continued)
Memory Operating Mode
Description
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.
Table 40. Memory population rules
Processor
Configuration
Memory population
Memory population information
Single processor
Optimizer (Independent
channel) population order
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12
•
DIMMs must be populated in the order
specified.
•
Odd number of DIMM population is allowed
NOTE:
Odd number of DIMMs will
result in unbalanced memory
configurations, which in turn will result
in performance loss. It is recommended
to populate all memory channels
identically with identical DIMMs for
best performance.
•
Optimizer population order is not traditional for
4 and 8 DIMM installations of single processor.
○
For 4 DIMMs: A1, A2, A4, A5
○
For 8 DIMMs: A1, A2, A4, A5, A7, A8, A10,
A11
Mirror population order
{1, 2, 3, 4, 5, 6} {7, 8, 9, 10,
11, 12}
Mirroring is supported with 6 or 12 DIMMs per
processor.
Single rank sparing
population order
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12
•
DIMMs must be populated in the order
specified.
•
Requires two ranks or more per channel.
Multi rank sparing
population order
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12
•
DIMMs must be populated in the order
specified.
Installing and removing system components
113