Chapter 6: UEFI BIOS
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Isoc Mode
Select Enable to enable Isochronous support to meet QoS (Quality of Service) require-
ments. This feature is especially important for Virtualization Technology. The options are
Disable, Enable, and
Auto
.
Memory Configuration
Integrated Memory Controller (iMC)
Enforce POR
Select POR to enforce POR restrictions for DDR4 memory frequency and voltage pro-
gramming. The options are
POR
and Disable.
PPR Type
Post Package Repair (PPR) is a new feature available for the 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.
Enhanced PPR
Use this feature to enable or disable DRAM Test and Postpackage Repair function during
POST. The options are
Disable
and Enable.
Operation Mode
Use this feature to set Test Only or Test/Repair from the Enhanced PPR. The options
are
Test and Repair
and Test Only.
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 perfor-
mance 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 ("Col-
umn 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 Disable and
Auto
.
