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Chapter 4: UEFI BIOS
(-snoop All) state indicates that the data may exist in another socket in an exclusive or
modified state. The S state (-Shared) indicates that the data is clean and may be shared
in the caches across one or more sockets. When the system is performing "read" on the
memory and if the directory line is in A state, we must snoop all other sockets because
another socket may have the line in a modified state. If this is the case, a "snoop" will
return the modified data. However, it may be the case that a line "reads" in an A state,
and all the snoops come back with a "miss". This can happen if another socket reads the
line earlier and then has silently dropped it from its cache without modifying it. If "Stale
AtoS" is enabled, a line will transition to the S state when the line in the A state returns
only snoop misses. That way, subsequent reads to the line will encounter it in the S state
and will not have to snoop, saving the latency and snoop bandwidth. Stale "AtoS" may
be beneficial in a workload where there are many cross-socket reads. The options are
Disable, Enable, and Auto.
LLC Dead Line Alloc
Select Enable to opportunistically fill the dead lines in the LLC. The options are Disable,
Enable, and Auto.
UPI3 (Available when your motherboard supports dual processors)
Use this feature to enable/disable the 4th Intel Ultra Path Interconnect (UPI) link. The
default setting is Enable if your motherboard supports UPI3. The options are Disable and
Enable. This feature depends on your system configuration.
Memory Configuration
This feature allows you to configure the Integrated Memory Controller (iMC) settings.
Enforce DDR Memory Frequency POR
Select POR to enforce Plan of Record (POR) restrictions for DDR memory frequency
and voltage programming. The options are POR and Disable.
Memory Frequency
Use this feature to set the maximum memory frequency for onboard memory modules.
The options are Auto, 3200, 3600, 4000, 4400, 4800, 5200, and 5600. Please note that
the available options are CPU dependent.
Data Scrambling for PMem (Available when any PMem device is detected by the
BIOS)
Select Enable to enable data scrambling for PMem modules to enhance memory data
security. Select Auto to use the Memory Reference Code (MRC) defaulting setting for
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