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Chapter 2 Installation and BIOS Setup
Intel VT for Directed I/O (VT-d)
Select Enable to use Intel Virtualization Technology support for Direct I/O VT-d support by
reporting the I/O device assignments to the VMM (Virtual Machine Monitor) through the
DMAR ACPI Tables. This feature offers fully-protected I/O resource sharing across Intel
platforms, providing greater reliability, security and availability in networking and data-sharing.
The options are Enable and Disable.
Interrupt Remapping
Select Enable for Interrupt Remapping support to enhance system performance. The options are
Enable and Disable.
Coherency Support (Non-Isoch)
Select Enable for the Non-Iscoh VT-d engine to pass through DMA (Direct Memory Access) to
enhance system performance. The options are Enable and Disable.
Coherency Support (Isoch)
Select Enable for the Iscoh VT-d engine to pass through ATS to enhance system performance.
The options are Enable and Disable.
QPI (Quick Path Interconnect) Configuration
QPI Status
The following information will display:
• Number of CPU
• Number of IIO
• Current QPI Link Speed
• Current QPI Link Frequency
• QPI Global MMIO Low Base/Limit
• QPI Global MMIO High Base/Limit
• QPI PCIe Configuration Base/Size
Link Speed Mode
Use this item to select the data transfer speed for QPI Link connections. The options are Fast
and Slow.
Link Frequency Select
Use this item to select the desired frequency for QPI Link connections. The options are 6.4 GB/s,
8.0 GB/s, 9.6 GB/s, Auto, and Auto Limited.
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