Biostar A770 A2G PLUS - BIOS User manual

A770 A2G+ BIOSManual
i
BIOS Setup.................................................................................................1
1Main Menu...............................................................................................3
2Advanced Menu.......................................................................................7
3PCIPnP Menu........................................................................................17
4Boot Menu..............................................................................................20
5Chipset Menu.........................................................................................22
6Performance Menu...............................................................................33
7Exit Menu...............................................................................................35

A770 A2G+ BIOSManual
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BIOS Setup
Introduction
The purpose of this manual is to describe the settings in the AMI BIOS Setup
program on this motherboard. The Setup program allows users to modify the basic
system configuration and save these settings to CMOS RAM. The power ofCMOS
RAM is supplied by abattery so that it retains theSetup informationwhen the power
is turned off.
Basic Input-Output System (BIOS) determines what a computer can do without
accessing programs from a disk. This system controls most of the input and output
devices such as keyboard, mouse, serial ports and disk drives. BIOS activates at the
first stage ofthe booting process, loading and executing the operating system. Some
additional features, such as virus and password protection or chipset fine-tuning
options are also included in BIOS.
The rest of this manual will to guide you through the options and settings in BIOS
Setup.
Plugand Play Support
ThisAMI BIOS supports thePlug and Play Version 1.0A specification.
EPA Green PC Support
ThisAMI BIOS supports Version 1.03 ofthe EPA Green PC specification.
APM Support
This AMI BIOS supports Version 1.1&1.2 of the Advanced Power Management
(APM) specification. Power management features are implemented via the System
Management Interrupt (SMI). Sleep and Suspend power management modes are
supported. Power to the hard disk drives and video monitors can also be managed by
this AMI BIOS.
ACPI Support
AMI ACPI BIOS support Version 1.0/2.0 of Advanced Configuration and Power
interface specification (ACPI). It provides ASL code for power management and
device configuration capabilities as defined in theACPI specification, developed by
Microsoft, Intel andToshiba.

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PCI Bus Support
This AMI BIOS also supports Version 2.3 of the Intel PCI (Peripheral Component
Interconnect) local bus specification.
DRAM Support
DDR2 SDRAM (Double Data Rate II Synchronous DRAM) is supported.
Supported CPUs
ThisAMI BIOS supports the AMD CPU.
Using Setup
When starting up the computer, press
<Del> during the Power-On Self-Test
(POST) to enter theBIOS setup utility.
In the BIOS setup utility, you will see
General Help description at the top right
corner, and this is providing a brief
description of the selected item.
Navigation Keys for that particular menu
are at the bottom right corner, and you can
use these keys to select item and change
the settings.
Notice
zThe default BIOS settings applyfor mostconditions to ensure optimum performance
of the motherboard. If the system becomes unstable after changing any settings,
please load the default settings to ensure system’s compatibility and stability. Use
Load Setup Default under the Exit Menu.
zFor better system performance, the BIOS firmware is being continuously updated.
The BIOS information described in this manual isfor yourreferenceonly. The actual
BIOS information and settings on board may be slightly different from this manual.
zThe content ofthis manual is subject to be changed without notice. We will not be
responsible for any mistakes found in this user’s manual and any system damage that
may be caused by wrong-settings.
General Help
Navigation Keys

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1 Main Menu
Once you enter AMI BIOS Setup Utility, the Main Menu will appear on the screen
providing an overview of the basic system information.
BIOS SETUP UTILITY
Main Advanced PCIPnP Boot Chipset Performance
vxx.xx (C)Copyright 1985-200x, American Megatre nds, Inc.
Select Screen
Select Item
Change Field
Select Field
General Help
Save and Exit
Exit
+-
Tab
F1
F10
ESC
Use [ENTER], [TA B]
or [SHIFT-TAB] to
select a field.
Use [+] or [-] t o
configure system Time.
System Overview
AMI BIOS
System Memory
[ :00:00]
System Date [Tue 01/01/2008]
Floppy A
> IDE Configuratio n
Version :01.01.01
Build Date:01/01/08
Size :
System Time 00
Exit
AMI BIOS
Shows systeminformation, including BIOS version and built date.
System Memory
Shows systemmemory size.
System Time
Set the systeminternal clock.
System Date
Set the system date. Note that the ‘Day’ automatically changes when you set the
date.

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Floppy A
Select the typeof floppy disk drive installed in your system.
Options: 360K, 5.25in / 1.2M, 5.25 in/ 720K, 3.5 in / 1.44M, 3.5 in /
2.88M, 3.5in / None
IDE Configuration
The BIOS will automatically detect the presence of IDE/SATA devices. There is a
sub-menu for each IDE/SATA device. Select a device and press <Enter> to enter
the sub-menu ofdetailed options.
BIOS SETUP UTILITY
Main
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Go to Sub Screen
General Help
Save and Exit
Exit
Enter
F1
F10
ESC
While entering setup ,
BIOS auto detects th e
presence of IDE
devices. This displa ys
the status of auto
detection of IDE
devices.
IDE Confuguration
> Primary IDE Slave
> SATA 1 Device
Hard Disk Write Protect [Disabled]
IDE Detect Time Out (Sec) [35]
> SATA 2 Device
> SATA 3 Device
> SATA 4 Device
> SATA 5 Device
> SATA 6 Device
> Primary IDE Master

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Primary IDEMaster/Slave ;SATA 1/2/3/4/5/6 Device
BIOS SETUP UTILITY
Main
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Select the type
of device connected
to the system.
Primary IDE Master
LBA/Large Mode [Auto]
Block (Multi-Sector Transfer)[Auto]
PIO Mode [Auto]
DMA Mode [Auto]
S.M.A.R.T [Auto]
32Bit Data Transfer [Enabled]
Device :
Type [Auto]
The BIOS detects the information and values of respective devices, and these
information and values are shown below to the name ofthesub-menu.
Type
Select the typeofthe IDE/SATAdrive.
Options: Auto (Default) / CD/DVD / ARMD / Not Installed
LBA/Large Mode
Enable or disable the LBA mode.
Options: Auto (Default) / Disabled
Block (Multi-Sector Transfer)
Enable or disable multi-sector transfer.
Options: Auto (Default) / Disabled
PIOMode
Select the PIO mode.
Options: Auto (Default) / 0 / 1/ 2 / 3 /4
DMA Mode
Select the DMA mode.
Options: Auto (Default) / SWDMA0 ~ 2 / MWDMA0 ~ 2 / UDMA0 ~ 5
S.M.A.R.T
Set the Smart Monitoring, Analysis, and ReportingTechnology.
Options: Auto (Default) / Disabled / Enabled

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32Bit Data Transfer
Enable or disable 32-bit data transfer.
Options: Enabled (Default) / Disabled
Hard Disk Write Protect
Disable or enable device write protection. This will be effective only if the device
is accessed through BIOS.
Options: Disabled (Default) / Enabled
IDE Detect Time Out (Sec)
Select the time out value for detecting IDE/SATA devices.
Options: 35 (Default)/ 30 / 25/ 20 / 15 / 10 / 5 / 0

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2Advanced Menu
The Advanced Menu allows you to configure thesettings ofCPU, Super I/O, Power
Management, and othersystem devices.
Notice
zBeware of that setting inappropriate values in items of this menu may cause
system tomalfunction.
BIOS SETUP UTILITY
Main Advanced PCIPnP Boot Chipset Performa nce
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Go to Sub Screen
General Help
Save and Exit
Exit
Enter
F1
F10
ESC
Configure CPU.Advanced Settings
WARNING: Setting wrong values in below sections
may cause system to malfunction.
> Hyper Transport Configuration
> SuperIO Configuration
> Smart Fan Configuration
> Hardware Health Configuration
> Power Configuration
> USB Configuration
> CPU Configuration
Exit
CPU Configuration
Thisitem shows theCPU information that theBIOS automatically detects.
BIOS SETUP UTILITY
Advanced
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Enable/Disable
Secure Virtual Machine
Mode (SVM)
CPU Configuration
Module Version:
AGESA Version:
Physical Count:
Logical Count:
AMD CPU
Revision:
Cache L1:
Cache L2:
Cache L3:
Speed : NB Clk:
Able to Change Freq :
uCode Patch Level :
Secure Virtual Machine Mode [Enabled]
PowerNow [Enabled]
ACPI SRAT Table [Enabled]

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Secure VirtualMachine Mode
Virtualization Technology can virtually separate your system resource into several
parts, thus enhance the performance when running virtual machines or multi
interface systems.
Options: Enabled (Default) / Disabled
PowerNow
Thisitem allows you to enable or disablethePowerNow power saving technology.
Options: Enabled (Default) / Disabled
ACPI SRAT Table
The operating system scans the ACPI SRAT at boot time and uses the information to
better allocate memory and schedule software threads for maximum performance.
This item controls whether the SRAT is made available to the operating system at
boot up, or not.
Options: Enabled (Default) / Disabled
Hyper Transport Configuration
BIOS SETUP UTILITY
Advanced
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
The HyperTransport
link will run at this
speed if it is slower
than or equal to the
system clock and the
board is capable.
Hyper Transport Configuration
NODE0:PCI-X2 HT Link
HT Link Width : [Auto]
HT Link Speed : [Auto]
HT Link Speed
Thisitem allows you to determine the speed ofHyper Transport.
Options: Auto (Default) / 200 MHz / 400 MHz / 600 MHz / 800MHz/ 1 GHz /
1.2 GHz / 1.4 GHz /1.6 GHz / 1.8 GHz

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HT Link Width
Thisitem allows you to determine the data width of Hyper Transport.
Options: Auto (Default) / 4 Bit / 8 Bit / 16Bit
SuperIO Conf iguration
BIOS SETUP UTILITY
Advan ced
vxx .xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Allows BIOS to Enable
or Disable Floppy
Controller
Configure ITE8 718 Super IO Chipset
Onboard Floppy Controller [Ena bled]
Serial Port1 Address [3F8 /IRQ4]
Parallel Port Address [378 ]
Parallel Port Mode [Normal]
Parallel Port IRQ [IRQ7]
Keyboard Power On [Dis abled]
Mouse PowerOn [Dis abled]
Restore on AC Power Loss [Power Off]
Onboard Floppy Controller
Select enabled if your system has a floppy disk controller (FDC) installed on the
system board and you wish to use it. Ifyou installed another FDC or the system uses
no floppy drive, select disabled in this field.
Options: Enabled (Default) / Disabled
Serial Port1Address
Select an address and corresponding interrupt for the first and second serial ports.
Options: 3F8/IRQ4 (Default) / 2F8/IRQ3 / 3E8/IRQ4 / 2E8/IRQ3/ Disabled
ParallelPort Address
Thisitem allows you to determine access onboard parallel port controller with which
I/O Address.
Options: 378 (Default) / 278 / 3BC / Disabled

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ParallelPortMode
Thisitem allows you to determine how the parallel port should function.
Options: Normal (Default) Using Parallel port as Standard Printer Port.
EPP Using Parallel Port as Enhanced Parallel Port.
ECP Using Parallel port as Extended Capabilities Port.
ECP+EPP Using Parallel port as ECP& EPP mode.
ECP Mode DMA Channel
Thisitem allows you to select parallel port ECP DMA.
Options: DMA3 (Default) / DMA0 / DMA1
Parallel Port IRQ
Thisitem allows you to select the IRQ for the onboard parallel port.
Options: IRQ7 (Default) / IRQ5
Keyboard PowerOn
Thisitem allows you to control thekeyboard power on function.
Options: Disabled (Default) /Specific Key / Stroke Key
Specific KeyEnter
Thisitem will show only when Keyboard PowerOn is set “Specific Key.”
Stroke KeysSelected
Thisitem will show only when Keyboard PowerOn is set “Stroke Key.”
Options: Ctrl+F1 (Default) / Wake Key / PowerKey / Ctrl+F2 / Ctrl+F3 /
Ctrl +F4 / Ctrl+F5/Ctrl+F6
MousePowerOn
Thisitem allows you to control themouse poweron function.
Options: Disabled (Default) / Enabled

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Restore on AC Power Loss
Thissetting specifies how yoursystem should behave after a power fail or interrupts
occurs. By choosing Disabled will leave the computer in the power off state.
Choosing Enabled will restore the system to the status before power failure or
interrupt occurs.
Options: Power Off(Default)/ Power ON / LastState
Smart Fan Configuration
BIOS SETUP UTILITY
Advanced
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
When you choice [Auto]
,[3Pin] or [4Pin],
please run the
calibration to define
the Fan parameters for
Smart Fan control
Smart Fan Configuration
CPU Smart Fan [Disabled]
Smart Fan Calibration
Control Mode
Fan Ctrl OFF( C)
o
Fan Ctrl On(C)
Fan Ctrl Start value
Fan Ctrl Sensitive
o
CPU Smart Fan
Thisitem allows you to control theCPUSmart Fan function.
Options: Disabled (default) / Auto / 4-pin / 3-pin
Smart Fan Calibration
Choose this item and then the BIOS will auto test and detect the CPU/System fan
functions and show CPU/Systemfan speed.
Control Mode
Thisitem provides several operation modes ofthefan.
Options: Quiet / Performance/ Manual

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Fan Ctrl OFF(℃ )
IftheCPU/System Temperatureis lowerthan theset value, FAN will turn off.
Options: 0~127 (℃)
Fan Ctrl On(℃ )
CPU/System fan starts to work under smart fan function when arrivethis set value.
Options: 0~127 (℃)
Fan Ctrl Start Value
When CPU/System temperature arrives to the set value, the CPU/System fan will
work under Smart Fan Functionmode.
Options: 0~127 (℃)
Fan Ctrl Sensitive
Increasing the value will raise the speed of CPU/System fan.
Options: 1~127
Hardware HealthConfiguration
Thisitem shows the system temperature, fan speed, and voltage information.
Advanced
Hardware Health Configuration
H/W Health Function [Enabled]
Shutdown Temperature [Disabled]
SYS
CPU Temperature
CPU FAN Speed(JCFAN1)
CHIP FAN Speed(JNFAN1)
SYS FAN Speed(JSFAN1)
CPU VCore
NB Voltage
+3.30V
+5.00V
+12.0V
DDR Voltage
HT Voltage
5VSB
Temperature
BIOS SETUP UTILITY
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Enables Hardware
Health Monitoring
Device.

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H/W Health Function
If you computer contains a monitoring system, it will show PC health status during
POST stage.
Options: Enabled (Default) / Disabled
Shutdown Temperature
This item allows you to set up the CPU shutdown Temperature. This item is only
effective under Windows 98 ACPImode.
Options: Disabled (Default) / 60℃/140℉/ 65℃/149℉/ 70℃/158℉/ 75℃/167℉
/ 80℃/176℉/ 85℃/185℉/ 90℃/194℉
Power Configuration
BIOS SETUP UTILITY
Advanced
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Select the ACPI
state used for
System Suspend.
ACPI Settings
Suspend mode [S1 (POS)]
ACPI Version Features [ACPI v1.0]
ACPI APIC support [Enabled]
AMI OEMB table [Enabled]
Headless mode [Disabled]
RTC Resume [Disabled]
RTC Alarm Date(Days)
System Time
USB Wakeup From S3/S4 [Disabled]
Power On by LAN [Disabled]
Wake on Ring [Disabled]
Suspend mode
The item allows you to select the suspend type under the ACPIoperating system.
Options: S1 (POS) (Default) Power on Suspend
S3(STR) Suspend toRAM
Auto POS+STR
Repost Video on S3 Resume
The item allows you to determine whether to invoke VGA BIOS post on S3/STR
resume.
Options: No (Default) / Yes

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ACPI Version Features
The item allows you to select the version of ACPI.
Options: ACPI v1.0 (Default) / ACPI v2.0 / ACPI v3.0
ACPI APIC support
This item is used to enable or disable the motherboard's APIC (Advanced
Programmable Interrupt Controller). The APIC provides multiprocessor support,
moreIRQs and faster interrupt handling.
Options: Enabled (Default) / Disabled
AMI OEMB table
Set this valueto allowthe ACPIBIOS toadd a pointer to an OEMBtable in theRoot
System Description Table (RSDT) table.
Options: Enabled (Default) / Disabled
Headless mode
This is a server-specific feature. A headless server is one that operates without a
keyboard, monitor or mouse. To run in headless mode, both BIOS and operating
system (e.g. WindowsServer 2003) must supportheadless operation.
Options: Disabled (Default) / Enabled
RTC Resume
When “Enabled”, you can set the date and time at which the RTC (real-time clock)
alarm awakens the system from Suspend mode.
Options: Disabled (Default) / Enabled
RTC Alarm Date (Days)
You can choose which date the system will boot up.
RTC Alarm Time (HH:MM:SS)
You can choose the system boot up time, input hour, minute and second to specify.

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USBWakeup from S3/S4
Thisitem allows you to enable or disabled the USB resumefrom S3/S4 function.
Options: Disabled (Default) / Enabled
Power On by LAN
Thisitem allows you control thewake on LAN (WOL) function.
Options: Disabled (Default) / Enabled
Wake On Ring
Thisitem allows you control thewake on ring function.
Options: Disabled (Default) / Enabled
USB Configuration
Thisitem shows the USB controller and using USB deviceinformation.
BIOS SETUP UTILITY
Advanced
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Enables support for
legacy USB. AUTO
option disables
legacy support if
no USB devices are
connected.
USB Configuration
USB Devices Enabled:
Module Version - 2.24.3-13.4
Legacy USB Support [Enabled]
USB 2.0 Controller Mode [HiSpeed]
BIOS EHCI Hand-Off [Enabled]
> USB Mass Storage Device Configuration
Legacy USB Support
This item determines if the BIOS should provide legacy support for USB devices
like the keyboard, mouse, and USB drive. This is a useful feature when using such
USB devices with operating systems that do not natively support USB (e.g.
Microsoft DOS or Windows NT).
Options: Enabled (Default) / Disabled / Auto

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USB2.0 ControllerMode
Thisitem allows you to select the operation modeofthe USB 2.0 controller.
Options: HiSpeed (Default) USB 2.0-480Mbps
FullSpeed USB 1.1-12Mbps
BIOS EHCI Hand-Off
This item allows you to enable support for operating systems without an EHCI
hand-off feature.
Options: Enabled (Default) / Disabled
USBMass Storage Device Configuration
BIOS SETUP UTILITY
Advanced
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Number of seconds
POST waits for the
USB mass storage
device after start
unit command.
USB Mass Storage Device Configuration
USB Mass Storage Reset Delay [20 Sec]
Emulation Type [Auto]
Device #
USB Mass Storage Reset Delay
Thisitem allows you to set the reset delay for USB mass storage device.
Options: 20 Sec (Default) / 10 Sec / 30Sec / 40Sec
Emulation Type
Thisitem allows you to select the emulation type ofthe USB mass storage device.
Options: Auto (Default) / Floppy / Forced FDD/ Hard Disk / CDROM

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3 PCIPnP Menu
This section describes configuring the PCI bus system. PCI, or Personal Computer
Interconnect, is a system which allows I/O devices to operate at speeds nearing the
speed ofthe CPU itselfuses when communicating with itsown special components.
Notice
zBeware of that setting inappropriate values in items of this menu may cause
system tomalfunction.
BIOS SETUP UTILITY
Main Advanced PCIPnP Boot Chipset Performa nce
vxx.xx (C)Copyright 1985-200x, American Megatre nds, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Clear NVRAM during
System Boot.
Advanced PCI/PnP Settings
WARNING: Setting wrong values in below sections
may cause system to malfunction.
Plug & Play O/S [No]
PCI Latency Timer [64]
Allocate IRQ to PCI VGA [Yes]
Palette Snooping [Disabled]
PCI IDE BusMaster [Enabled]
> PCI Resource
> PCI Express Conf iguration
Clear NVRAM [No]
Exit
Clear NVRAM
Thisitem allows you to clear thedata in the NVRAM (CMOS) by selecting “Yes”.
Options: No (Default) / Yes
Plug & Play OS
When set to YES, BIOS will only initialize the PnP cards used for the boot sequence
(VGA, IDE, SCSI). The rest of the cards will be initialized by the PnP operating
system like Window™ 95. When set to NO, BIOS will initialize all the PnP cards.
For non-PnP operating systems (DOS, Netware™), this option must set to NO.
Options: No (Default) / Yes

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PCI Latency Timer
Thisitem controls howlong a PCI device can hold the PCI bus before another takes
over. The longer the latency, the longer the PCI device can retain control ofthe bus
before handing it overto another PCI device.
Options: 64 (Default)/ 32 / 96/ 128 / 160 / 192/ 224 / 248
Allocate IRQ to PCI VGA
Thisitem allows BIOSto choose an IRQto assignfor the PCI VGAcard.
Options: Yes (Default) / No
Palette Snooping
Someold graphic controllers need to “snoop” on the VGA palette and then map it to
theirdisplay as a way to provide boot information and VGA compatibility. This item
allows such snooping to take place.
Options: Disabled (Default) / Enabled
PCI IDE BusMaster
Thisitem is atoggle for the built-in driver that allows theonboard IDE controller to
perform DMA (Direct Memory Access) transfers.
Options: Enabled (Default) / Disabled
PCI Resource
BIOS SETUP UTILITY
PCIPnP
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Available: Specified
IRQ is available to be
used by PCI/PnP
devices.
Reserved: Specified
IRQ is reserved for
use by Legacy ISA
devices.
PCI Resource
IRQ3 [Available]
IRQ4 [Available]
IRQ5 [Available]
IRQ7 [Available]
IRQ9 [Available]
IRQ10 [Available]
IRQ11 [Available]
IRQ14 [Available]
IRQ15 [Available]
DMA Channel 0 [Available]
DMA Channel 1 [Available]
DMA Channel 3 [Available]
DMA Channel 5 [Available]
DMA Channel 6 [Available]
DMA Channel 7 [Available]
Reserved Memory Size [Disabled]

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IRQ3/4/5/7/9/10/11/14/15
These items will allow you to assign each system interrupt a type, depending on the
type of device using the interrupt. Theoption “Available” means the IRQ is going
to assign automatically.
Options: Available (Default) / Reserved
DMAChannel0/1/3/5/6/7
These items will allow you to assign each DMA channel a type, depending on the
type of device using the channel. The option “ Available” means the channel is
going to assign automatically.
Options: Available (Default) / Reserved
ReservedMemory Size
Thisitem allows BIOSto reserve certain memory size for specific PCI device.
Options: Disabled (Default) / 16K / 32K / 64K
PCI Express Configuration
BIOS SETUP UTILITY
PCIPnP
vxx.xx (C)Copyright 1985-200x, American Megatrends, Inc.
Select Screen
Select Item
Change Option
General Help
Save and Exit
Exit
+-
F1
F10
ESC
Enable/Disable
PCI Express L0s and
L1 link power
states.
PCI Express Configuration
Active State Power-Management[Disabled]
Active State Power-Management
This item sets the ASPM configuration for the PCI Express devices before the
operating system boots. This function is for OS which does not support ASPM.
Options: Disabled (Default) / Enabled