MSI K7t266 Pro2u Manual
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3-9 BIOS Setup Boot To OS/2 This allows you to run the OS/2® operating system with DRAM larger than 64MB. When you choose No, you cannot run the OS/2® operating system with DRAM larger than 64MB. But it is possible if you choose Yes. Internal Cache Cache memory is additional memory that is much faster than conventional DRAM (system memory). When the CPU requests data, the system transfers the requested data from the main DRAM into cache memory, for even faster access by the CPU. The setting controls the internal cache (also known as L1 or level 1 cache). Setting to WriteBack will speed up the system performance. System BIOS Cacheable Selecting Enabled allows caching of the system BIOS ROM at F0000h- FFFFFh, resulting in better system performance. However, if any program writes to this memory area, a system error may result. Setting options: Enabled, Disabled. C000, 32k Shadow This item specifies how the contents of the adapter ROM named in the item are handled. Settings are described below: Option Description Setup The password prompt appears only when end users try to run Setup. Always A password prompt appears every time when the com- puter is powered on or when end users try to run Setup. Option Description Disabled The specified ROM is not copied to RAM. Enabled The contents of specified ROM are copied to RAM for faster system performance. Cached The contents of specified ROM are not only copied to RAM, the contents of the ROM area can be writ- ten to and read from cache memory.
3-10 MS-6593 ATX Mainboard APIC Function This field is used to enable or disable the APIC (Advanced Programmable Interrupt Controller). Due to compliance to PC2001 design guide, the system is able to run in APIC mode. Enabling APIC mode will expand available IRQs resources for the system. Settings: Enabled, Disabled. MPS Table Version This field allows you to select which MPS (Multi-Processor Specification) version to be used for the operating system. You need to select the MPS ver- sion supported by your operating system. To find out which version to use, consult the vendor of your operating system. Settings: 1.4, 1.1.
3-11 BIOS Setup Advanced Chipset Features DRAM Timing Control Press and the following sub-menu appears. Current Host Clock This item shows the current CPU frequency. MSI Reminds You... Change these settings only if you are familiar with the chipset.
3-12 MS-6593 ATX Mainboard Configure SDRAM Timing by Selects whether DRAM timing is controlled by the SPD (Serial Presence Detect) EEPROM on the DRAM module. Setting to SPD enables SDRAM Frequency, SDRAM CAS# Latency, Row Precharge Time, RAS Pulse Width, RAS to CAS Delay and SDRAM Bank Interleave auto- matically to be determined by BIOS based on the configurations on the SPD. Selecting User allows users to configure these fields manually. SDRAM Frequency Use this item to configure the clock frequency of the installed SDRAM. SDRAM CAS# Latency This controls the timing delay (in clock cycles) before SDRAM starts a read command after receiving it. 2 (clocks) increases the system performance the most while 3 (clocks) provides the most stable performance. Row Precharge Time This item controls the number of cycles for Row Address Strobe (RAS) to be allowed to precharge. If insufficient time is allowed for the RAS to accumulate its charge before DRAM refresh, refresh may be in- complete and DRAM may fail to retain data. This item applies only when synchronous DRAM is installed in the system. RAS Pulse Width This setting allows you to select the number of clock cycles allotted for the RAS pulse width, according to DRAM specifications. The less the clock cycles, the faster the DRAM performance. RAS to CAS Delay When DRAM is refreshed, both rows and columns are addressed separately. This setup item allows you to determine the timing of the transition from RAS (row address strobe) to CAS (column address strobe). The less the clock cycles, the faster the DRAM performance. SDRAM Bank Interleave This field selects 2-bank or 4-bank interleave for the installed SDRAM. Disable the function if 16MB SDRAM is installed.
3-13 BIOS Setup SDRAM Burst Length This setting allows you to set the size of Burst-Length for DRAM. Burst- ing feature is a technique that DRAM itself predicts the address of the next memory location to be accessed after the first address is accessed. To use the feature, you need to define the burst length, which is the ac- tual length of burst plus the starting address and allows internal address counter to properly generate the next memory location. The bigger the size, the faster the DRAM performance. SDRAM 1T Command This setting controls the SDRAM command rate. Selecting Enabled al- lows SDRAM signal controller to run at 1T (T=clock cycles) rate. Se- lecting Disabled makes SDRAM signal controller run at 2T rate. 1T is faster than 2T. Fast Command This item controls the internal timing of CPU. Selecting Ultra allows CPU to handle data/instructions at the fastest speed. Fast enables CPU to handle at a faster speed, while Normal let CPU handle them at the slowest rate. AGP Timing Control Press and the following sub-menu appears. AGP Mode The item sets an appropriate mode for the installed AGP card. Setting options: 1x, 2x, 4x, Auto. Select 4x only if your AGP card supports it.
3-14 MS-6593 ATX Mainboard AGP Comp. Driving This field is used to adjust the AGP driving force. Selecting Manual allows you to select an AGP driving force in Manual AGP Comp. Driving. It is strongly recommended to select Auto to avoid causing any system error. Manual AGP Comp. Driving This item specifies an AGP driving force. AGP Fast Write This field enables or disables the AGP Fast Write feature. The Fast Write technology allows the CPU to write directly to the graphics card without passing anything through the system memory and improves the AGP 4X speed. Select Enabled only when the installed AGP card supports the function. AGP Aperture Size This setting controls just how much system RAM can be allocated to AGP for video purposes. The aperture is a portion of the PCI memory address range dedicated to graphics memory address space. Host cycles that hit the aperture range are forwarded to the AGP without any translation. AGP Master 1 W/S Write The field allows users to insert one wait state into the AGP write cycle. AGP Master 1 W/S Read The field allows users to insert one wait state into the AGP read cycle. AGP Read Synchronization The field allows you to enable or disable the AGP Read Synchronization feature. PCI Delay Transaction The chipset has an embedded 32-bit posted write buffer to support delayed transactions cycles so that transactions to and from the ISA bus are buffered and PCI bus can perform other transactions while the ISA transaction is underway. Select Enabled to support compliance with PCI specification ver- sion 2.1. Setting options: Enabled, Disabled.
3-15 BIOS Setup Power Management Features IPCA Function This item is to activate the ACPI (Advanced Configuration and Power Man- agement Interface) function. If your operating system is ACPI-aware, such as Windows 98SE/2000/ME, select Yes. ACPI Standby State This item specifies the power saving modes for ACPI function. If your oper- ating system supports ACPI, such as Windows 98SE, Windows ME and Win- dows 2000, you can choose to enter the Standby mode in S1(POS) or S3 (STR) fashion through the setting of this field. Call VGA at S3 Resuming Selecting Enabled allows BIOS to call VGA BIOS to initialize the VGA card when system wakes up (resumes) from S3 sleep state. The system resume time is shortened when you disable the function, but system will need an AGP driver to initialize the VGA card. Therefore, if the AGP driver of the card does not support the initialization feature, the display may work abnormally or not function after resuming from S3. MSI Reminds You... S3-related functions described in this section are available only when your BIOS supports S3 sleep mode.
3-16 MS-6593 ATX Mainboard USB Wakeup From S3 This item allows the activity of the USB device to wake up the system from S3 (Suspend to RAM) sleep state. Power Management/APM Setting to Enabled will activate an Advanced Power Management (APM) device to enhance Max Saving mode and stop CPU internal clock. Power/Sleep LED This item configures how the system uses power LED on the case to indicate the sleep/suspend state. Available options are: Single LEDThe power LED turns off to indicate the sleep/suspend state. Dual LEDThe power LED changes its color to indicate the sleep/ suspend state. Suspend Time Out (Minute) After the selected period of system inactivity, all devices except the CPU shut off. Display Activity These items specify if the BIOS will monitor the activity of the specified hardware peripheral or component. If set to Monitor, any activity detected on the specified hardware peripheral or component will wake up the system or prevent the system from entering the power saving modes. CPU Critical Temperature If the CPU temperature reaches the upper limit preset in this setting, the warn- ing mechanism will be activated. This helps you to prevent the CPU overheat- ing problem. Power Button Function This feature sets the function of the power button. Settings are: On/OffThe power button functions as normal power off button. SuspendWhen you press the power button, the computer enters the suspend/sleep mode, but if the button is pressed for more than four seconds, the computer is turned off. After AC Power Loss This setting specifies whether your system will reboot after a power failure or
3-17 BIOS Setup interrupt occurs. Setting to Last State will restore the system to the previous status before power failure or interrupt occurred. Set WakeUp Events Press and the following sub-menu appears. Wake Up On PME, Resume On KBC (with “Wake-Up Key” and “Wake-Up Password”), Resume On PS/2 Mouse These fields specify whether the system will be awakened from power saving modes when activity or input signal of the specified hardware peripheral or component is detected. Resume By Alarm This is used to enable or disable the feature of booting up the system on a scheduled time/date from the soft off (S5) state. Alarm Date/Hour/Minute/Second If Resume By Alarm is set to Enabled, the system will automatically re- sume (boot up) on a specific date/hour/minute/second specified here. MSI Reminds You... 1. For “Wake-Up Key” function, the option “Specific Key” refers to the password you specify in the “Wake-Up Password” field. Once you set up a password, it will disable “Resume on PS/2 Mouse”. 2. For “Resume On PS/2 Mouse” function, you need to left-click the mouse to power on the system if the function is enabled.
3-18 MS-6593 ATX Mainboard PNP/PCI Configurations Plug and Play Aware O/S When set to Yes, BIOS will only initialize the PnP cards used for booting. The rest of the cards will be initialized by the PnP operating system like Win- dows ® 98, 2000 or ME. When set to No, BIOS will initialize all the PnP cards. Clear NVRAM The ESCD (Extended System Configuration Data) NVRAM (Non-volatile Random Access Memory) is where the BIOS stores resource information for both PNP and non-PNP devices in a bit string format. When the item is set to Yes, the system will reset ESCD NVRAM right after the system is booted up and then set the setting of the item back to No automatically. 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 transac- tions for a longer time and thus improve the effective PCI bandwidth. PCI IDE BusMaster Set this option to Enabled to specify that the IDE controller on the PCI local bus has bus mastering capability. Primary Graphics Adaptor This setting specifies which VGA card is your primary graphics adapter. PCI Slot1 IRQ, PCI Slot2/5 IRQ, PCI Slot3/6 IRQ, PCI Slot4 IRQ These items specify the IRQ line for each PCI slot.