X8DTG-DF User’s Manual
North Bridge Configuration
This feature allows the user to configure the settings for the Intel North Bridge chip.
Crystal Beach/DMA (Direct Memory Access)
This feature works in conjunction with the Intel I/O AT (Acceleration Technology) to accelerate the performance of TOE devices. (Note: A TOE device is a special- ized, dedicated processor that is installed on an add-on card or a network card to handle some or all packet processing of this add-on card.) When this feature is set to Enabled, it will enhance overall system performance by providing direct memory access for data transferring. The options are Enabled and Disabled.
Coarse-Grained Clock Gating
Coarse Grained Clock Gating (CGCG) a power-saving technique used on an Intel IO Hub (IOH). When this feature is set to Disabled, all clocks on the die of the IOH chip will be disabled except for the Intel management engine (Intel ME) subsystem. Any non ME clocks left running will detect events to restore clock to the whole die. When this feature is set to Enabled, all clocks on the die will be enabled to maximize power efficiency. The options are Enabled and Disabled.
Intel VT-d
Select Enabled to enable Intel's Virtualization Technology support for Direct I/O VT-d by reporting the I/O device assignments to VMM through the DMAR ACPI Tables. This feature offers fully-protected I/O resource-sharing across the Intel platforms, providing the user with greater reliability, security and availability in networking and data-sharing. The settings are Enabled and Disabled.
IOH PCIE Port1 Link Select
This feature allows the user to configure the link setting for PCI-Express Port 1 that is connected to the Intel IOH chip. The options are x4x4x4x4, x4x4x8, x8x4x4x, x8x8 and x16.
IOH PCIE Max Payload Size
Some add-on cards perform faster with the coalesce feature, which limits the payload size to 128 MB; while others, with a payload size of 256 MB by disabling coalesce support. Please refer to your add-on card user guide for the desired set- ting. The options are 256 MB and 128MB.
South Bridge Configuration
This feature allows the user to configure Intel ICH South Bridge settings.