Chapter 4: AMI BIOS
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C3 Auto Demotion
When this feature is enabled, the CPU will conditionally demote C6 or C7 requests
to C3 based on un-core auto-demote information. The options are Enabled and
Disabled.
ACPI T State
Select Enabled to report CPU throttling state in ACPI. The options are Enabled
and Disabled.
Advanced Chipset Control
CPU Bridge Confi guration
This feature allows the user to confi gure CPU Bridge settings.
CPU Revision
• : This item displays the CPU revision number.
Current QPI Frequency:
• This item displays current QPI frequency.
Current CPU1/CPU2 Memory Frequency:
• This item displays current CPU
memory frequency.
Memory Reference Code:
• This item displays the memory reference code.
QPI Reference Code:
• This item displays the QPI reference code for the moth-
erboard.
Request Transaction ID (Available for the Intel Xeon 5600 platform only)
QuickPath Interconnect (QPI) is the connection between the CPUs and the I/O
hub (IOH). For a transaction to be processed in the QPI, a "Transaction ID" is
required, and it is assigned by an agent (CPU1, CPU2 or the IOH). Each agent
is allocated a number of Transaction IDs based on the QPI IO Bandwidth and the
Request Transaction ID (RTID) setting (32-24-32 or 32-16-40). Once Transaction
IDs are allocated to an agent, it will assign a Transaction ID to an event so that
it can be processed in the QPI. Select Balanced to allocate transaction IDs to
an agent based on the setting 32-24-32. Select IO Bias to allocate RTIDs based
on the setting 32-16-40. The options are Balanced and IO Bias.
QPI (Quick Path Interconnect) Links Speed
This feature is used to set data transfer speed for QPI Link connections. The
options are Slow-Mode and Full-Speed.
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