Chapter 4: UEFI BIOS
81
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
, Soft
PPR, Hard 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 2933MHz
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 Auto, SPD (Serial Presence Detect) will automatically override
tCCD_L ("Column to Column Delay-Long", or “Command to Command Delay-Long” on the
column side) based on memory frequency. If this feature is set to Disable, tCCD_L will be
enforced based on the memory frequency. The options are
Auto
, 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
Disable
, and Enable.
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
.
IMC Interleaving
Use this feature to configure interleaving settings for the IMC (Integrated Memory
Controller), which will improve memory performance. The options are 1-way Interleave,
2-way Interleave, and
Auto
.
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