Skip to main content

Memory

This menu displays and provides options to change the memory setting.

Note
Options that are marked as N/A are read-only information and cannot be changed.
ItemOperationDescription
System Memory Details Provides status of System Memory.
Total Usable Memory Capacityyyyy GBDisplays the total usable memory capacity.
Memory Speed

  • Maximum

  • xxxxMHz

  • Minimum

Dynamic information.

The memory speed is changed dynamically according to the combination of the installed CPU SKU, DIMM type, number of DIMMs per channel, and system motherboard support.

The system operates at the rated speed of the slowest DIMM in the system when populated with different speed DIMMs. If DIMMs are installed with a rated speed below 2400, this will result in the memory speed getting set to the Minimum value.

Memory Power Down Enable

  • Enable

  • Disable

Enable or disable low-power features for DIMMs.

Enable is the default setting.

NUMA Nodes per Socket

  • NPS0

  • NPS1

  • NPS2

  • NPS4

Specifies the number of desired NUMA nodes per CPU socket(e.g. NPS1 means 1 NUMA per socket). NPS0 will attempt to interleave the 2 CPU sockets together (non-NUMA mode).

DRAM Scrub Time

  • Disable

  • 1 hour

  • 4 hour

  • 8 hour

  • 16 hour

  • 24 hour

  • 48 hour

Sets the period of time between successive DRAM scrub events.
DRAM Post Package Repair

  • Enable

  • Disable

Enable or disable DRAM Post Package Repair.

Enable is the default setting.

SMEE

  • Enable

  • Disable

Control secure memory encryption enable.

Disable is the default setting.

SEV ASID Count

  • 253 ASIDs

  • 509 ASIDs

  • AUTO

This fields specifies the maximum valid ASID, which affects the maximum system physical address space. 16TB of physical address space is available for systems that support 253 ASIDs, while 8TB of physical address space is available for systems that support 509 ASIDs.
SEV-ES ASID Space Limit Control

  • AUTO

  • Manual

Customize SEV-ES ASID space limit.
SEV-ES ASID Space Limit

  • 1

Range: 1 – 510

SEV VMs using ASIDs below the SEV-ES ASID Space Limit must enable the SEV-ES feature. ASIDs from SEV-ES ASID Space Limit to (SEV ASID Count + 1) can only be used with SEV VMs. If this field is set to (SEV ASID Count + 1), all ASIDs are forced to be SEV-ES ASIDs. Hence, the valid values for this field is 1 - (SEV ASID Count + 1).
Note
SEV Control

  • Enable

  • Disable

Disable or enable SEV. To re-enable SEV, a power cycle is needed after selecting the <Enabled> option.

Interleave

  • Auto

  • Disable

Enables or disables memory interleaving. Note that the NUMA nodes per socket value will be honored regardless of this setting.

Auto is the default setting.

SubUrgRefLowerBound[4]

Specifies the stored refresh limit to required enter sub-urgent refresh mode.

Constraint: SubUrgRefLowerBound is less than or equal to UrgRefLimit.

Valid value: 6 ~ 1.

UrgRefLimit[6]

Specifies the stored refresh limit to required enter urgent refresh mode.

Constraint: SubUrgRefLowerBound is less than or equal to UrgRefLimit.

Valid value: 6 ~ 1.

DRAM Refresh Rate

  • 1x

  • 2x

For better performance, a refresh rate of 1x is recommended. To mitigate rowhammer issue, choose refresh rate 2x, note that this may have a performance side effect.

1x is the default setting.

TSME

  • Disable

  • Enable

  • AUTO

TSME refers to Transparent Secure Memory Encryption.

If choose Enable, the following parameters will be displayed:

  • AddrTweakEn = 1

  • ForceEncrEn = 0

  • DataEncrEn = 1

AUTO is the default setting.

RAM Disk Configuration 

Sub menu.

Press [Enter] to add or remove RAM disks.