Cisco UCS C890 M5, Instruction Manual

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Memory Frequency
Use this feature to set the maximum memory frequency for onboard memory modules. The
options are Auto , 1866, 2000, 2133, 2400, 2666, and 2933. ( Note : 2933 MHz memory is
supported by the Intel® 82xx series only.)
Data Scrambling for DDR4
Select Enable to enable data scrambling for DDR4 memory to enhance system performance
and security. Select Auto for the default setting of the Memory Reference Code (MRC) to
set configure data scrambling for DDR4 setting. The options are Auto , Disable, and Enable.
tCCD_L Relaxation
If this feature is set to Enable, SPD (Serial Presence Detect) will override tCCD_L ("Column to
Column Delay- Long", or “Command to Command Delay - Long” on the column side.) If this
feature is set to Disable, tCCD_L will be enforced based on the memory frequency. The
options are Auto , Enable, and Disable.
tRWSR (Read to Write turnaround time for Same Rank) Relaxation
Select Enable to use the same tRWSR DDR timing setting among all memory channels, and
in which case, the worst-case value among all channels will be used. Select Disable to use
different values for the tRWSR DDR timing settings for different channels as trained. The
options are Auto, Disable , and Enable.
Enable ADR
Select Enable for ADR (Async DIMM Self-Refresh) support to enhance memory performance.
The options are Disable and Enable .
Data Scrambling for NVDIMM
Select Enable to enable data scrambling support for onboard NVDIMM memory to improve
system performance and security. The options are Auto , Disable, and Enable.
Erase-Arm NVDIMMs
If this feature is set to Enable, the function that arms the NVDIMMs for safe operations in
the event of a power loss will be removed. The options are Enable and Disable.
Restore NVDIMMs
Select Enable to restore the functionality and the features of NVDIMMs. The options are
Enable and Disable.