Supermicro X11DDW-L/NT User Manual page 92

Super X11DDW-L/NT User's Manual
PPR Type
Post Package Repair (PPR) is a new feature available for DDR4 Technology. PPR provides
additional spare capacity within a DDR4 DRAM module that is used to replace faulty cell
areas detected during system boot. PPR offers two types of memory repairs. Soft Post
Package Repair (sPPR) provides a quick, temporary fix on a raw element in a bank group
of a DDR4 DRAM device, while hard Post Package Repair (hPPR) will take a longer time
to provide a permanent repair on a raw element. The options are Auto, Hard PPR, Soft
PPR, and PPR Disabled.
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: Support for 2933 MHz
memory is dependent on the CPU SKU.)
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 and Disable.
2X Refresh
Select Enable for memory 2X refresh support to enhance memory performance. The options
are Enable and Auto.
Page Policy
Use this feature to set the page policy for onboard memory support. The options are Closed,
Adaptive, and Auto.
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.
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