Dimm Operating Speeds; Dimm Rank Classification Labels; Inconsistencies Between Dimm Fault Indicators And The Bios Isolation Of Faulty Dimms - Oracle X7-8 Service Manual

Install a Processor
configuration) or CMOD 7 (eight-CMOD configuration). After all CMODs are populated,
go back to CMOD 0 and repeat the sequence adding the next set of eight to each CMOD.
For example: CMOD 0 gets the initial eight DIMMs, followed by CMOD 1 with the next
eight DIMMs, continuing with all CMODs in the configuration. When 32 DIMMs (4-
CMOD) or 64 DIMMs (8-CMOD) have been added across all CMODs in the configuration,
go back to CMOD 0 for the next set of eight and continue this population pattern.
Each CMOD must only contain one size of DIMM. Mixing of different size memory within
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a CMOD is not allowed. Size mixing between CMODs is not allowed.
Mixing of LVDIMM and LRDIMM in the same chassis is not allowed.
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DIMM Operating Speeds

The maximum supported memory speed is 2667 MT/s. However, not all system configurations
will support operation at this speed. The maximum attainable memory speed will be limited
by the maximum speed supported by the specific type of processor and the specific memory
population. All memory installed in the system will operate at the same speed, or frequency.

DIMM Rank Classification Labels

DIMMs come in a variety of ranks: dual or quad. The server supports 64-GB quad-rank (QR)
Load-Reduced DIMMs (LRDIMMs) and 32-GB dual-rank (DR) and 16-GB DR Registered
DIMMs (RDIMMs). Each DIMM is shipped with a label identifying its rank classification. The
following table identifies the label corresponding to each DIMM rank classification:
Quad-rank LRDIMM: 4Rx4
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Dual-rank RDIMM: 2Rx4
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Inconsistencies Between DIMM Fault Indicators
and the BIOS Isolation of Faulty DIMMs
When a single DIMM is marked as failed by Oracle ILOM (for example, fault.memory.
intel.dimm.training-failed is listed in the service processor Event Log), BIOS might
disable the entire memory channel that contains the failed DIMM, up to two DIMMs. As a
result, none of the memory installed in the disabled channel will be available to the operating
188 Oracle Server X7-8 Service Manual • October 2017