MSI CR400 User Manual - Page 76
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BIOS Setup 4-6 Advanced Menu Intel SpeedStep tech. This item allows you to enable or disable Intel® SpeedStepTM technology. When set to Disabled, the system always operates in a conserve power mode (the processor works at FSB400-600MHz or FSB533-800MHz). If you want optimize the processor, set this item to Enabled, so that the processor's speed will be controlled by the use of your operating system and applications. Setting options: Enabled, and Disabled. AHCI This item allows you to select AHCI or SATA mode. For users who want to install Windows XP by themselves, please select SATA mode beforehand. Legacy USB Support Selecting Enabled allows users to use USB devices, such as mouse, keyboard, or portable disk, in DOS system; or allows users to boot system by USB device. Setting options: Auto, Enabled and Disabled. PCI Latency Timer This item controls how long each PCI device can hold the bus before another takes over. When set to higher values, every PCI device can conduct transactions for a longer time and thus improve the effective PCI bandwidth. For better PCI performance, you should set the item to higher values.