Albatron Technology PX845PEV-800 manual Formulas, Watch Dog Timer

Page 13

Albatron Anniversary Special Edition PX845PEV-800

Formulas

CPU Speed = CPU Clock Ratio * CPU Host Frequency

DDR Speed = DDR: CPU Ratio * CPU Host Frequency

(The CPU Clock Ratio is usually locked by the CPU manufacturer which means it will not be displayed. You can only adjust the CPU Host Frequency to change the CPU speed. For more details, please refer to the Frequency / Voltage Control section in Chapter 2.)

If you do not adjust the option, then the CPU Host Frequency will be equal of default CPU Host Frequency. Or you can adjust the “CPU Host Frequency” and “DDR: CPU Ratio” in the BIOS Setup Utility for overclocking the CPU and DDR RAM, but we do not guarantee that damage will or will not occur.

Overclocking example (to FSB 800): have an Intel® Pentium4 Host Frequency 1.7 GHz CPU (133MHz, 13 Ratio) and a DDR 400 RAM module plugged on Albatron PX845PEV-800 mainboard. Adjust the “CPU Host Frequency” to 200 and the “DDR: CPU Ratio” to 2.00 (default) in the BIOS Utility. Then the result: the CPU Speed will be 2.6 GHz, and DDR Speed will be DDR 400. (Suggestion: if you adjust your CPU Host Frequency over 166, disable the “Fixed AGP/PCI Output Freq” item.)

Note: The AGP and PCI frequencies are both calculated from the Default CPU Host frequency according to the table below. To determine your frequencies, first locate the row that corresponds to the “Default CPU Host frequency”. Then, calculate the AGP and PCI frequencies according to the formulas in the adjacent cells.

Default CPU Host frequency

PCI frequency

AGP frequency

100 MHz

CPU Host frequency ÷ 3

CPU Host frequency * (2/3)

133 MHz

CPU Host frequency ÷ 4

CPU Host frequency * (2/4)

200 MHz

CPU Host frequency ÷ 5

CPU Host frequency * (2/5)

E.g.: If your “Default CPU Host frequency” is 133, then the AGP frequency will be 66 MHz and the PCI frequency will be 33 MHz.

Watch Dog Timer

This mainboard comes with a special feature called “Watch Dog Timer” which is used to detect when the system is unable to boot using the manual over-clocking configurations. After you power on the system, BIOS will check the last system POST status. If it was successful, BIOS will enable the “Watch Dog Timer” feature and set the CPU frequency values to the user configured values stored in the BIOS. If unsuccessful the “Watch Dog Timer” will reboot the system.

On most systems you would need to remove the cover of your system and re-jumper the clear CMOS switches on the mainboard when your system encounters over-clocking problems. With the “Watch Dog Timer”, overclocking settings will be automatically cleared and reset.

Before Overclocking

Please make sure your system components are capable of overclocking.

If you are not familiar with the overclocking, we strongly recommend that you to set the clock to the default settings.

10

Image 13
Contents Albatron PX845PEV-800 Copyright Contents Introduction Getting StartedCPU SpecificationsLAN Bios Function Content Location Quick Content TableConfiguration Subject Hardware InstallationCPU Socket 478 Configuration Steps CPU Processor InstallationFAN Headers Frequency / Voltage ControlFormulas Watch Dog TimerRAM Module Installation Memory InstallationDIMM1 DIMM2 DIMM3 Memory installation notePS/2 Mouse & PS/2 Keyboard Connectors KB/MS Back Panel ConfigurationUSB & LAN Connectors USB/LAN Serial Interface COM1/ COM2 Serial and Parallel Interface PortsParallel Interface Port PRT Front Panel Indicator SW/LED Connector ConfigurationIrDA Infrared Connector Speaker Speaker ConnectorHard Disk Connectors IDE1/ IDE2 Floppy Disk Connector FDCIDE1 Primary IDE Connector IDE2 Secondary IDE ConnectorHeaders & Jumpers Case Open Warning connector Case OpenFront USB Headers USB2 / USB3 USB Bracket 2 Ports or 4 PortsJP1 Clear Cmos Jumper JP1AGP Accelerated Graphics Port Slot SlotsPCI Peripheral Component Interconnect Slots ATX Power Connector ATX12V & Atxpwr Power Supply AttachmentsBios Setup Key Function Supported CPUsMain Menu Main Menu Setup Configuration Options First /Second/Third/ Boot Device Advanced Bios FeaturesBoot Other Device Boot Up Floppy SeekBoot Up NumLock Status Quick Power On Self TestTypematic Rate Setting Typematic Delay MsecAdvanced Chipset Features PnP/PCI Configurations Frequency/Voltage Control Intel OnChip IDE Device Integrated PeripheralsOn-Chip Primary/Secondary PCI IDE IDE Primary/Secondary/Master/Slave PIOIntel OnChip PCI Device Onboard I/O Chip SetupInit Display First IR Transmission Delay Uart Mode SelectUR2 Duplex Mode Use IR PinsRun Vgabios if S3 Resume Power ManagementPower Management Acpi Suspend TypeHDD Power Down Suspend ModeVideo Off Method Video Off In SuspendTime hh mm ss Alarm Date of Month AlarmReload Global Timer Events USB KB Wake-up From S3Case Open Warning Hardware MonitorLoad System Default Settings Load DefaultsLoad System Turbo Settings Load Cmos From BiosExit Menu Save & Exit SetupExit Without Saving Software Installation Software SetupSoftware List Problem TroubleshootingProblem Problem Hardward installation SpecificationSoftware Installation Appendix I:Appendix II: Albatron USA Inc Appendix III: