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P5GD2-VM

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Summary of Contents for Asus P5GD2-VM

  • Page 1 P5GD2-VM...
  • Page 2 Product warranty or service will not be extended if: (1) the product is repaired, modified or altered, unless such repair, modification of alteration is authorized in writing by ASUS; or (2) the serial number of the product is defaced or missing.
  • Page 3: Table Of Contents

    Contents Notices ....................vi Safety information ................vii P5GD2-VM specifications summary ..........viii Chapter 1: Chapter 1: Hardware information Hardware information Chapter 1: Chapter 1: Chapter 1: Hardware information Hardware information Hardware information Before you proceed .............. 1-2 Motherboard overview ............1-3 1.2.1...
  • Page 4 Creating a bootable floppy disk ......2-2 2.1.2 ASUS EZ Flash utility ..........2-3 2.1.3 AFUDOS utility ............2-4 2.1.4 ASUS CrashFree BIOS 2 utility ........ 2-6 BIOS setup program ............2-10 2.2.1 BIOS menu screen ..........2-11 2.2.2 Menu bar ............... 2-11 2.2.3...
  • Page 5 Contents Power menu ................ 2-27 2.5.1 Suspend Mode ............2-27 2.5.2 Repost Video on S3 Resume ........ 2-27 2.5.3 ACPI 2.0 Support ..........2-27 2.5.4 ACPI APIC Support ..........2-27 2.5.5 APM Configuration ..........2-28 2.5.6 Hardware Monitor ..........2-30 Boot menu ................
  • Page 6: Notices

    Notices Federal Communications Commission Statement Federal Communications Commission Statement Federal Communications Commission Statement Federal Communications Commission Statement Federal Communications Commission Statement This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: • This device may not cause harmful interference, and •...
  • Page 7: Safety Information

    Safety information Electrical safety Electrical safety Electrical safety Electrical safety Electrical safety • To prevent electrical shock hazard, disconnect the power cable from the electrical outlet before relocating the system. • When adding or removing devices to or from the system, ensure that the power cables for the devices are unplugged before the signal cables are connected.
  • Page 8: P5Gd2-Vm Specifications Summary

    P5GD2-VM specifications summary C P U C P U C P U LGA775 socket for Intel ® Pentium ® 4/Celeron processor C P U C P U Compatible with Intel ® PCG 04A and 04B processors Supports Intel ® Hyper-Threading Technology ®...
  • Page 9 P5GD2-VM specifications summary I n t e r n a l I n t e r n a l I n t e r n a l I n t e r n a l I n t e r n a l...
  • Page 10 x x x x x...
  • Page 11 This chapter lists the hardware setup procedures that you have to perform when installing system components. It includes description of the jumpers and connectors on the motherboard. Hardware information...
  • Page 12: Before You Proceed

    SB_PWR1 ® Standby Powered P5GD2-VM Onboard LED Power 1 - 2 1 - 2 C h a p t e r 1 : H a r d w a r e i n f o r m a t i o n...
  • Page 13: Motherboard Overview

    Motherboard overview Before you install the motherboard, study the configuration of your chassis to ensure that the motherboard fits into it. Make sure to unplug the power cord before installing or removing the motherboard. Failure to do so can cause you physical injury and damage motherboard components.
  • Page 14: Motherboard Layout

    1.2.3 1.2.3 Motherboard layout Motherboard layout 1.2.3 1.2.3 1.2.3 Motherboard layout Motherboard layout Motherboard layout CPU_FAN1 PS/2KBMS T: Mouse B: Keyboard FANPWR1 COM1 ATX12V1 LGA775 VGA1 F_USB12 LAN_USB34 Intel Top:Rear Speaker Out 915G Center: Side Speaker Out GMCH Below: Center/Subwoofer Top:Line In Center:Line Out Below:Mic In...
  • Page 15: Central Processing Unit (Cpu)

    Contact your retailer immediately if the PnP cap is missing, or if you see any damage to the PnP cap/socket contacts/motherboard components. ASUS will shoulder the cost of repair only if the damage is shipment/ transit-related. •...
  • Page 16 Press the load lever with your thumb (A), then move it to the left (B) until it is released from the retention tab. R e t e n t i o n t a b R e t e n t i o n t a b R e t e n t i o n t a b R e t e n t i o n t a b R e t e n t i o n t a b...
  • Page 17 Close the load plate (A), then push the load lever (B) until it snaps into the retention tab. The CPU fits in only one correct orientation. DO NOT force the CPU into the socket to prevent bending the connectors on the socket and damaging the CPU! Notes on Intel Notes on Intel...
  • Page 18: Installling The Cpu Heatsink And Fan

    1.3.2 1.3.2 Installling the CPU heatsink and fan Installling the CPU heatsink and fan 1.3.2 1.3.2 1.3.2 Installling the CPU heatsink and fan Installling the CPU heatsink and fan Installling the CPU heatsink and fan The Intel ® Pentium ® 4 LGA775 processor requires a specially designed heatsink and fan assembly to ensure optimum thermal condition and performance.
  • Page 19 CPU_FAN1. CPU_FAN1 ® P5GD2-VM CPU fan connector Do not forget to connect the CPU fan connector! Hardware monitoring errors can occur if you fail to plug this connector. A S U S P 5 G D 2 - V M...
  • Page 20: Uninstalling The Cpu Heatsink And Fan

    1.3.3 1.3.3 1.3.3 Uninstalling the CPU heatsink and fan Uninstalling the CPU heatsink and fan Uninstalling the CPU heatsink and fan 1.3.3 1.3.3 Uninstalling the CPU heatsink and fan Uninstalling the CPU heatsink and fan To uninstall the CPU heatsink and fan: Disconnect the CPU fan cable from the connector on the motherboard.
  • Page 21 Carefully remove the heatsink and fan assembly from the motherboard. Rotate each fastener clockwise to ensure correct orientation when reinstalling. N a r r o w e n d o f t h e g r o o v e N a r r o w e n d o f t h e g r o o v e N a r r o w e n d o f t h e g r o o v e N a r r o w e n d o f t h e g r o o v e...
  • Page 22: System Memory

    The motherboard comes with four 240-pin Double Data Rate (DDR2) Dual Inline Memory Modules (DIMM) sockets. DDR2 DIMMS are notched differently to prevent installation on a DDR DIMM socket. The following figure illustrates the location of the sockets: ® P5GD2-VM 240-pin DDR2 DIMM sockets 1.4.2 1.4.2 Memory Configurations Memory Configurations 1.4.2...
  • Page 23 DDR2 (400 MHz) Qualified Vendors List DDR2 (400 MHz) Qualified Vendors List DDR2 (400 MHz) Qualified Vendors List DDR2 (400 MHz) Qualified Vendors List DDR2 (400 MHz) Qualified Vendors List D I M M s u p p o r t D I M M s u p p o r t D I M M s u p p o r t D I M M s u p p o r t...
  • Page 24 DDR2 (533MHz) Qualified Vendors List DDR2 (533MHz) Qualified Vendors List DDR2 (533MHz) Qualified Vendors List DDR2 (533MHz) Qualified Vendors List DDR2 (533MHz) Qualified Vendors List D I M M s u p p o r t D I M M s u p p o r t D I M M s u p p o r t D I M M s u p p o r t D I M M s u p p o r t...
  • Page 25 D I M M s u p p o r t : D I M M s u p p o r t : D I M M s u p p o r t : D I M M s u p p o r t : D I M M s u p p o r t : A A A A A - supports one module inserted into either slot, in a Single-channel memory configuration.
  • Page 26: Installing A Ddr2 Dimm

    1.4.3 1.4.3 Installing a DDR2 DIMM Installing a DDR2 DIMM 1.4.3 1.4.3 1.4.3 Installing a DDR2 DIMM Installing a DDR2 DIMM Installing a DDR2 DIMM Unplug the power supply before adding or removing DIMMs or other system components. Failure to do so can cause severe damage to both the motherboard and the components.
  • Page 27: Expansion Slots

    Expansion slots In the future, you may need to install expansion cards. The following sub-sections describe the slots and the expansion cards that they support. Make sure to unplug the power cord before adding or removing expansion cards. Failure to do so may cause you physical injury and damage motherboard components.
  • Page 28: Pci Slots

    Standard interrupt assignments Standard interrupt assignments Standard interrupt assignments Standard interrupt assignments Standard interrupt assignments I R Q I R Q P r i o r i t y P r i o r i t y S t a n d a r d F u n c t i o n S t a n d a r d F u n c t i o n I R Q I R Q...
  • Page 29 1.5.3 1.5.3 PCI slots PCI slots 1.5.3 1.5.3 1.5.3 PCI slots PCI slots PCI slots The PCI slots support cards such as a LAN card, SCSI card, USB card, and other cards that comply with PCI specifications. The figure shows a LAN card installed on a PCI slot.
  • Page 30: Jumpers

    CLRTC1 ® Normal Clear CMOS P5GD2-VM Clear RTC RAM (Default) You do not need to clear the RTC when the system hangs due to overclocking. For system failure due to overclocking, use the C.P.R. (CPU Parameter Recall) feature. Shut down and reboot the system so the BIOS can automatically reset parameter settings to default values.
  • Page 31 DC mode (Default) ® P5GD2-VM FAN power setting We recommend the use of a 4-pin CPU fan. A S U S P 5 G D 2 - V M A S U S P 5 G D 2 - V M...
  • Page 32: Connectors

    Connectors 1.7.1 1.7.1 1.7.1 1.7.1 1.7.1 Rear panel connectors Rear panel connectors Rear panel connectors Rear panel connectors Rear panel connectors 1 . 1 . P S / 2 m o u s e p o r t ( g r e e n ) . P S / 2 m o u s e p o r t ( g r e e n ) .
  • Page 33 8 . 8 . M i c r o p h o n e p o r t ( p i n k ) . M i c r o p h o n e p o r t ( p i n k ) . M i c r o p h o n e p o r t ( p i n k ) .
  • Page 34: Internal Connectors

    ® PIN 1 P5GD2-VM Floppy disk drive connector 2 . 2 . P o w e r L E D c o n n e c t o r ( 3 - 1 p i n P L E D 1 )
  • Page 35 (usually zigzag) on the IDE ribbon cable to PIN 1. ® PIN 1 P5GD2-VM IDE connector A S U S P 5 G D 2 - V M A S U S P 5 G D 2 - V M 1 - 2 5...
  • Page 36: Hard Disk Drives

    SATA1 SATA2 P5GD2-VM SATA connectors I m p o r t a n t n o t e s o n S e r i a l A T A I m p o r t a n t n o t e s o n S e r i a l A T A...
  • Page 37 CPU_FAN1 CHA_FAN1 ® Rotation +12V P5GD2-VM Fan connectors A S U S P 5 G D 2 - V M A S U S P 5 G D 2 - V M 1 - 2 7 1 - 2 7...
  • Page 38 ® USB56 USB78 P5GD2-VM USB 2.0 connectors Never connect a 1 3 9 4 c a b l e 1 3 9 4 c a b l e 1 3 9 4 c a b l e 1 3 9 4 c a b l e 1 3 9 4 c a b l e to the USB connectors.
  • Page 39 Ground Ground +12V DC +3 Volts -12 Volts P5GD2-VM ATX power connectors +3 Volts +3 Volts A S U S P 5 G D 2 - V M A S U S P 5 G D 2 - V M...
  • Page 40 ® P5GD2-VM CD audio connector 9 . 9 . C h a s s i s i n t r u s i o n c o n n e c t o r ( 4 - 1 p i n C H A S S I S 1 )
  • Page 41 Legacy AC’97 compliant definition compliant definition ® P5GD2-VM Analog front panel connector We recommend that you connect a high-definition front panel audio module to this connector to avail of the motherboard’s high-definition audio capability. A S U S P 5 G D 2 - V M...
  • Page 42: System Panel Connector

    PLED PWRSW F_PANEL1 ® IDE LED RESET P5GD2-VM System panel connector The sytem panel connector is color-coded for easy connection. Refer to the connector description below for details. • S y s t e m p o w e r L E D ( G r e e n 2 - p i n P L E D )
  • Page 43 This chapter tells how to change the system settings through the BIOS Setup menus. Detailed descriptions of the BIOS parameters are also provided. BIOS setup...
  • Page 44: Managing And Updating Your Bios

    Refer to the corresponding sections for details on these utilities. Save a copy of the original motherboard BIOS file to a bootable floppy disk in case you need to restore the BIOS in the future. Copy the original motherboard BIOS using the ASUS Update or AFUDOS utilities. 2.1.1 2.1.1 2.1.1...
  • Page 45: Asus Ez Flash Utility

    ASUS EZ Flash utility ASUS EZ Flash utility The ASUS EZ Flash feature allows you to update the BIOS without having to go through the long process of booting from a floppy disk and using a DOS-based utility. The EZ Flash utility is built into the BIOS chip so it is accessible by pressing <Alt>...
  • Page 46: Afudos Utility

    2.1.3 2.1.3 AFUDOS utility AFUDOS utility 2.1.3 2.1.3 2.1.3 AFUDOS utility AFUDOS utility AFUDOS utility The AFUDOS utility allows you to update the BIOS file in DOS environment using a bootable floppy disk with the updated BIOS file. This utility also allows you to copy the current BIOS file that you can use as backup when the BIOS fails or gets corrupted during the updating process.
  • Page 47 A:\>afudos /iP5GD2VMM.ROM The utility verifies the file and starts updating the BIOS. A:\>afudos /iP5GD2VMM.ROM AMI Firmware Update Utility - Version 1.19(ASUS V2.07(03.11.24BB)) Copyright (C) 2003 American Megatrends, Inc. All rights reserved. WARNING!! Do not turn off power during flash BIOS Reading file ..
  • Page 48: Asus Crashfree Bios 2 Utility

    ASUS CrashFree BIOS 2 utility ASUS CrashFree BIOS 2 utility The ASUS CrashFree BIOS 2 is an auto recovery tool that allows you to restore the BIOS file when it fails or gets corrupted during the updating process. You can update a corrupted BIOS file using the motherboard support CD or the floppy disk that contains the updated BIOS file.
  • Page 49 The utility displays the following message and automatically checks the floppy disk for the original or updated BIOS file. Bad BIOS checksum. Starting BIOS recovery... Checking for floppy... When found, the utility reads the BIOS file and starts flashing the corrupted BIOS file.
  • Page 50 When no floppy disk is found, the utility automatically checks the optical drive for the original or updated BIOS file. The utility then updates the corrupted BIOS file. Bad BIOS checksum. Starting BIOS recovery... Checking for floppy... Floppy not found! Checking for CD-ROM...
  • Page 51 A S U S U p d a t e A S U S U p d a t e A S U S U p d a t e. The ASUS Update main window appears. A S U S U p d a t e...
  • Page 52: Bios Setup Program

    BIOS setup program This motherboard supports a programmable firmware chip that you can update using the provided utility described in section “ 2.1 Managing and updating your BIOS.” Use the BIOS Setup program when you are installing a motherboard, reconfiguring your system, or prompted to “Run Setup.” This section explains how to configure your system using this utility.
  • Page 53: Bios Menu Screen

    Legacy Diskette A [1.44M, 3.5 in] Primary IDE Master : [ST320410A] Use [+] or [-] to Primary IDE Slave : [ASUS CD-S520/A] configure the System Third IDE Master : [Not Detected] Time. Third IDE Slave : [Not Detected]...
  • Page 54: Menu Items

    [1.44M, 3.5 in] bar displays the specific items for Primary IDE Master : [ST320410A] Use [+] or [-] to Primary IDE Slave : [ASUS CD-S520/A] configure the System that menu. For example, selecting Third IDE Master : [Not Detected] Time.
  • Page 55: Main Menu

    Legacy Diskette A [1.44M, 3.5 in] Primary IDE Master : [ST320410A] Use [+] or [-] to Primary IDE Slave : [ASUS CD-S520/A] configure the System Third IDE Master : [Not Detected] time. Third IDE Slave : [Not Detected]...
  • Page 56: Primary, Third, And Fourth Ide Master/Slave

    2.3.4 2.3.4 2.3.4 2.3.4 2.3.4 Primary, Third, and Fourth IDE Master/Slave Primary, Third, and Fourth IDE Master/Slave Primary, Third, and Fourth IDE Master/Slave Primary, Third, and Fourth IDE Master/Slave Primary, Third, and Fourth IDE Master/Slave While entering Setup, the BIOS automatically detects the presence of IDE devices.
  • Page 57: Ide Configuration

    PIO Mode [Auto] PIO Mode [Auto] PIO Mode [Auto] PIO Mode [Auto] PIO Mode [Auto] Selects the PIO mode. Configuration options: [Auto] [0] [1] [2] [3] [4] DMA Mode [Auto] DMA Mode [Auto] DMA Mode [Auto] DMA Mode [Auto] DMA Mode [Auto] Selects the DMA mode.
  • Page 58 Enhanced Mode Support On [SATA mode] The default setting SATA allows you to use native OS on Serial ATA and Parallel ATA ports. We recommend that you do not change the default setting for better OS compatibility. In this setting, you may o n l y i f o n l y i f use legacy OS on the Parallel ATA ports o n l y i f...
  • Page 59: System Information

    2.3.6 2.3.6 2.3.6 System Information System Information System Information 2.3.6 2.3.6 System Information System Information This menu gives you an overview of the general system specifications. The BIOS automatically detects the items in this menu. AMIBIOS System Time : [10:55:25] System Date : [Thu 09/30/04] Processor...
  • Page 60: Advanced Menu

    Advanced menu The Advanced menu items allow you to change the settings for the CPU and other system devices. Take caution when changing the settings of the Advanced menu items. Incorrect field values can cause the system to malfunction. Adjust system USB Configuration frequency/voltage CPU Configuration...
  • Page 61: Usb Configuration

    2.4.1 2.4.1 2.4.1 USB Configuration USB Configuration USB Configuration 2.4.1 2.4.1 USB Configuration USB Configuration The items in this menu allow you to change the USB-related features. Select an item then press <Enter> to display the configuration options. Enables USB host USB Configuration controllers.
  • Page 62: Cpu Configuration

    2.4.2 2.4.2 2.4.2 CPU Configuration CPU Configuration CPU Configuration 2.4.2 2.4.2 CPU Configuration CPU Configuration The items in this menu show the CPU-related information that the BIOS automatically detects. Configure advanced CPU Settings Sets the ratio between CPU Core Clock and the Manufacturer : Intel FSB Frequency.
  • Page 63: Chipset

    Enhanced C1 Control [Auto] Enhanced C1 Control [Auto] Enhanced C1 Control [Auto] Enhanced C1 Control [Auto] Enhanced C1 Control [Auto] When set to [Auto], the BIOS will automatically check the CPU’s capability to enable the C1E support. In C1E mode, the CPU power consumption is lower when idle.
  • Page 64 D R A M R A S # P r e c h a r g e [ 4 C l o c k s ] D R A M R A S # P r e c h a r g e [ 4 C l o c k s ] D R A M R A S # P r e c h a r g e [ 4 C l o c k s ] D R A M R A S # P r e c h a r g e [ 4 C l o c k s ] D R A M R A S # P r e c h a r g e [ 4 C l o c k s ]...
  • Page 65: Onboard Devices Configuration

    2.4.4 2.4.4 Onboard Devices Configuration Onboard Devices Configuration 2.4.4 2.4.4 2.4.4 Onboard Devices Configuration Onboard Devices Configuration Onboard Devices Configuration Configure Win627EHF Super IO Chipset Enable or disable the High Definition Audio Azalia Controller [Enabled] controller. Onboard LAN [Enabled] Onboard LAN Boot ROM [Disabled] Serial Port1 Address [3F8/IRQ4]...
  • Page 66 Parallel Port Mode [ECP] Parallel Port Mode [ECP] Parallel Port Mode [ECP] Parallel Port Mode [ECP] Parallel Port Mode [ECP] Allows you to select the Parallel Port mode. Configuration options: [Normal] [Bi-directional] [EPP] [ECP] E C P M o d e D M A C h a n n e l [ D M A 3 ] E C P M o d e D M A C h a n n e l [ D M A 3 ] E C P M o d e D M A C h a n n e l [ D M A 3 ] E C P M o d e D M A C h a n n e l [ D M A 3 ]...
  • Page 67: Pci Pnp

    2.4.5 2.4.5 2.4.5 PCI PnP PCI PnP PCI PnP 2.4.5 2.4.5 PCI PnP PCI PnP The PCI PnP menu items allow you to change the advanced settings for PCI/PnP devices. The menu includes setting IRQ and DMA channel resources for either PCI/PnP or legacy ISA devices, and setting the memory size block for legacy ISA devices.
  • Page 68 PCI IDE BusMaster [Enabled] PCI IDE BusMaster [Enabled] PCI IDE BusMaster [Enabled] PCI IDE BusMaster [Enabled] PCI IDE BusMaster [Enabled] Allows the BIOS to use PCI bus mastering when reading/writing to IDE devices. Configuration options: [Disabled] [Enabled] OffBoard PCI/ISA IDE Card [Auto] OffBoard PCI/ISA IDE Card [Auto] OffBoard PCI/ISA IDE Card [Auto] OffBoard PCI/ISA IDE Card [Auto]...
  • Page 69: Power Menu

    Power menu The Power menu items allow you to change the settings for the ACPI and Advanced Power Management (APM). Select an item then press <Enter> to display the configuration options. Select the ACPI state Suspend Mode [Auto] used for System Repost Video on S3 Resume [No] Suspend.
  • Page 70: Apm Configuration

    2.5.5 2.5.5 2.5.5 2.5.5 2.5.5 APM Configuration APM Configuration APM Configuration APM Configuration APM Configuration APM Configuration Go into On/Off or Suspend when Power Restore on AC Power Loss [Power Off] button is pressed. Power On By RTC Alarm [Disabled] Power On By External Modems [Disabled] Power On By PCI Devices...
  • Page 71 Power On By PS/2 Keyboard [Disabled] Power On By PS/2 Keyboard [Disabled] Power On By PS/2 Keyboard [Disabled] Power On By PS/2 Keyboard [Disabled] Power On By PS/2 Keyboard [Disabled] Allows you to use specific keys on the keyboard to turn on the system. This feature requires an ATX power supply that provides at least 1A on the +5VSB lead.
  • Page 72: Hardware Monitor

    CPU Q-Fan Control [Disabled] CPU Q-Fan Control [Disabled] CPU Q-Fan Control [Disabled] Allows you to enable or disable the ASUS Q-Fan feature that smartly adjusts the fan speeds for more efficient system operation. Configuration options: [Disabled] [Enabled] 2 - 3 0...
  • Page 73 CPU Fan Ratio [Auto] CPU Fan Ratio [Auto] CPU Fan Ratio [Auto] CPU Fan Ratio [Auto] CPU Fan Ratio [Auto] Allows you to select the appropriate CPU fan speed ratio for the system. The default [Auto] automatically selects the fan speed ratio when operating a low CPU temperature.
  • Page 74: Boot Menu

    2nd Boot Device [PM-ST3200410A] 3rd Boot Device [PS-ASUS CD-S520/A] 1st ~ xxth Boot Device [1st Floppy Drive] 1st ~ xxth Boot Device [1st Floppy Drive] 1st ~ xxth Boot Device [1st Floppy Drive] 1st ~ xxth Boot Device [1st Floppy Drive]...
  • Page 75: Boot Settings Configuration

    This allows you to enable or disable the full screen logo display feature. Configuration options: [Disabled] [Enabled] Set this item to [Enabled] to use the ASUS MyLogo™ feature. AddOn ROM Display Mode [Force BIOS] AddOn ROM Display Mode [Force BIOS]...
  • Page 76: Security

    Hit ‘DEL’ Message Display [Enabled] Hit ‘DEL’ Message Display [Enabled] Hit ‘DEL’ Message Display [Enabled] Hit ‘DEL’ Message Display [Enabled] Hit ‘DEL’ Message Display [Enabled] When set to Enabled, the system displays the message “Press DEL to run Setup” during POST. Configuration options: [Disabled] [Enabled] Interrupt 19 Capture [Disabled] Interrupt 19 Capture [Disabled] Interrupt 19 Capture [Disabled]...
  • Page 77 If you forget your BIOS password, you can clear clear it by erasing the CMOS Real Time Clock (RTC) RAM. See section “1.6 Jumpers” for information on how to erase the RTC RAM. After you have set a supervisor password, the other items appear to allow you to change other security settings.
  • Page 78: Exit Menu

    The message “Password Installed” appears after you set your password successfully. To change the user password, follow the same steps as in setting a user password. Clear User Password Clear User Password Clear User Password Clear User Password Clear User Password Select this item to clear the user password.
  • Page 79 Exit & Save Changes Exit & Save Changes Exit & Save Changes Exit & Save Changes Exit & Save Changes Once you are finished making your selections, choose this option from the Exit menu to ensure the values you selected are saved to the CMOS RAM. An onboard backup battery sustains the CMOS RAM so it stays on even when the PC is turned off.

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