Chapter 6: BIOS
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Degrade Precedence
Topology Precedence to degrade Features. Select Feature Precedence to degrade
Topology. The options are Topology Precedence and Feature Precedence.
Link L0p Enable
Select Enable for Link L0p support. The options are Enable and Disable.
Link L1 Enable
Select Enable for Link L1 support. The options are Enable and Disable.
IO Directory Cache (IODC)
IO Directory Cache is an 8-entry cache that stores the directory state of remote IIO writes
and memory lookups, and saves directory updates. Use this feature to lower cache to cache
(C2C) transfer latencies. The options are Disable, Auto, Enable for Remote InvItoM Hybrid
Push, InvItoM AllocFlow, Enable for Remote InvItoM Hybrid AllocNonAlloc, and Enable for
Remote InvItoM and Remote WViLF.
Isoc Mode
Select Enabled for Isochronous support to meet QoS (Quality of Service) requirements.
This feature is especially important for Virtualization Technology. The options are Enable
and Disable.
Memory Conguration
Enforce POR
Select Enable to enforce POR restrictions on DDR4 frequency and voltage programming.
The options are Enabled and Disable.
Memory Frequency
Use this feature to set the maximum memory frequency for onboard memory modules.
The options are Auto, 1333, 1400, 1600, 1800, 1867, 2000, 2133, 2200, and 2400.
Data Scrambling for NVDIMM
Use this festure to enable or disable data scrambling for non-volatile DIMM (NVDIMM)
memory. The options are Auto, Disable, and Enable.
Data Scrambling for DDR4
Use this feature to enable or disable data scrambling for DDR4 memory. 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 ("Col-
umn to Column Delay-Long", or “Command to Command Delay-Long” on the column
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