User`s manual

4-8
X8DTU/X8DTU-F User’s Manual
C3 Auto Demotion
When this item is set to Enabled, the CPU will conditionally demote C6 or C7 re-
quests to C3 based on un-core auto-demote information. The options are Disabled
and Enabled.
ACPI T State
Select Enabled to report processor throttling in the ACPI. The options are Disabled
and Enabled.
Advanced Chipset Control
The items included in the Advanced Settings submenu are listed below:
CPU Bridge Confi guration
CPU Revision• : This item displays the CPU revision number.
Current QPI Frequency:
• This item displays current QPI frequency.
Current CPU 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 Links Speed
This feature selects QPI's data transfer speed. The options are Slow-mode, and
Full Speed.