Acer AW2000ht-AW170ht F1 Acer AW2000ht w AW170htx F1 Server Service Guide - Page 78

DCA Prefetch Delay: Used with TOE components to prefetch data in order to shorten execution cycles and maximize data processing effi ciency. Prefetching too frequently can saturate the cache directory and delay necessary cache accesses. This feature reduces or increases the frequency the system prefetches data. Intel VT-d: Select Enabled to enable Intel 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 you with greater reliability, security and availability in networking and data-sharing. Active State Power-Management: Uses power management for signal transactions between the PCI Express L0 and L1 Links. Select Enabled to configure PCI Express L0 and L1 Link power states. IOH PCIE Max Payload Size: Some add-on cards perform faster with the coalesce feature, which limits the payload size to 128 MB. Others perform better with a payload size of 256 MB, which inhibits the coalesce feature. Please refer to your add-on card user guide for the desired setting. South Bridge configuration This feature allows you to configure the settings for the Intel ICH South Bridge chipset. USB Functions: This feature allows you to decide how many onboard USB ports to enable. Legacy USB Support: Select Enabled to use Legacy USB devices. If set to Auto, legacy USB support will be automatically enabled if a legacy USB device is installed on the motherboard. NOTE: Only available when USB Functions is set to Enabled. USB 2.0 Controller: Select Enabled to activate the onboard USB 2.0 controller. NOTE: Only available when USB Functions is set to Disabled. Otherwise, this item will be set to Enabled by the BIOS. USB 2.0 Controller Mode: This setting allows you to select the USB 2.0 Controller mode. BIOS EHCI Hand-Off: Enable or disable BIOS Enhanced Host Controller Interface support to provide a workaround solution for an operating system that does not have EHCI Hand-Off support. When enabled, the EHCI Interface will be changed from BIOS-controlled to OS-controlled. IDE/SATA configuration When this submenu is selected, the BIOS automatically detects the presence of the IDE devices and displays the following items: SATA#1 configuration: If Compatible is selected, it sets SATA#1 to legacy compatibility mode, while selecting Enhanced sets SATA#1 to native SATA mode. • Configure SATA#1 as - This feature allows you to select the drive type for SATA#1. The options are IDE, RAID and AHCI. • ICH RAID Code Base - Select Intel or Adaptec to launch the appropriate SATA RAID firmware to configure SATA RAID. SATA#2 configuration: Selecting Enhanced will set SATA#2 to native SATA mode. Primary IDE Master/Slave, Secondary IDE Master/Slave, Third IDE Master, and Fourth IDE Master: These settings allow you to set the parameters of the IDE slots. Press to activate the submenu screen for detailed options of these items. Set the configurations accordingly. Items included in the submenu are: • Type - Select the type of device connected to the system. • LBA/Large Mode - LBA (Logical Block Addressing) is a method of addressing data on a disk drive. In the LBA mode, the maximum drive capacity is 137 GB. For drive capacities over 137 GB, your system must be equipped with a 48-bit LBA mode addressing. If not, contact your manufacturer or install an ATA/133 IDE controller card that supports 48-bit LBA mode. • Block (Multi-Sector Transfer) - Block Mode boosts the IDE drive performance by increasing the amount of data transferred. Only 512 bytes of data can be transferred per interrupt if Block Mode is not used. Block Mode allows transfers of up to 64 KB per interrupt. Select Disabled to allow data to be transferred from and to the device one sector at a time. Select Auto to allow data transfer from and to the device occur multiple sectors at a time if the device supports it. 72 Chapter 9