SUPER MICRO Computer X8DTU-6TF+-LR manual Request Transaction ID, QPI L0s and L1, Memory Frequency

Chapter 5: AMI BIOS

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Current Memory Frequency: This item displays the current CPU memory frequency.

Memory Reference Code: This item displays the memory reference code for the motherboard.

QPI Reference Code: This item displays the QPI reference code for the moth- erboard.

Request Transaction ID

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

QuickPath Interconnect (QPI) is the connection between the CPU and the motherboard's I/O hub. Use this feature to set data transfer speed for QPI Link connections. The options are Slow-Mode, and Full Speed.

QPI Frequency (Available if the item - QPI Link Speed is set to Full Speed)

This feature allows the user to select the desired QPI frequency. The options are Auto, 4.800 GT, 5.866GT, 6.400 GT.

QPI L0s and L1

This feature allows the user to set the QPI power state to a low setting. L0s and L1 are automatically selected by the motherboard. The options are Disabled and Enabled.

Memory Frequency

This feature forces a DDR3 module to run at a frequency other than what the sys- tem has detected. Select Force SPD (Serial Presence Detect) to force the module to run at a frequency specified on the SPD table. The available options are Auto, Force DDR-800, Force DDR-1066, Force DDR-1333 and Force SPD.

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