User`s manual

Chapter 4: AMI BIOS
4-9
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.
QPI Frequency
This selects the desired QPI frequency. The options are Auto, 4.800GT, 5.866GT,
6.400GT.
QPI L0s and L1
Select Enabled to lower QPI power state to reduce power consumption. L0s
and L1 are automatically selected by the motherboard. The options are Enabled
and Disabled.
Memory Frequency
This feature forces a DDR3 memory module to run at a specifi c frequency. The
available options are Auto, Force DDR-800, Force DDR-1066, Force DDR-1333,
and Force SPD.
Memory Mode
If this item is set to Independent, all DIMMs are available to the operating system.
If this item is set to Channel Mirroring, the motherboard maintains two identical
copies of all data in memory for redundancy. If this item is set to Lockstep, the
motherboard uses two areas of memory to run the same set of operations in
parallel. Select Sparing to use memory sparing and create data redundancy in
memory modules for data security. (Sparing is supported by the 5600 processor.)
The options are Independent, Channel Mirroring, Sparing, and Lockstep.