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USB 2.0 Controller Mode [HiSpeed] Allows you to set the USB 2.0 controller mode to HiSpeed (480 Mbps) or FullSpeed (12 Mbps). This item appears only when you set the Legacy USB Support item to [Enabled] or [Auto]. Configuration options: [FullSpeed ] [HiSpeed ] BIOS EHCI Hand-off [Enabled] Allows you to enable support for operating systems without an EHCI hand‑off feature. Configuration options: [Disabled] [Enabled] 4.5.2 CPU Configuration The items in this menu show the CPU-related information that the BIOS automatically detects. BIOS SETUP UTILITY Advanced Configure advanced CPU settings Manufacturer:Intel Brand String:Intel(R) Core(TM)2 Duo CPU @ 3.00GHz Frequency :3.00GHz FSB Speed :1333MHz Cache L1 :64 KB Cache L2 :4096 KB CPUID :6F9 Ratio Status:Unlocked (Max:09.0, Min:06.0) Ratio Actual Value :9 CPU Ratio Setting [Auto] C1E Support [Enabled] CPU TM Function [Enabled] Vanderpool Technology [Enabled] Execute Disable Bit [Enabled] Max CPUID Value Limit [Disabled] Intel(R) SpeedStep(TM) Tech. [Enabled] Sets the ratio between CPU Core Clock and the FSB Frequency. NOTE: If an invalid ratio is set in CMOS then actual and setpoint values may differ. NOTE: Please Key in ratio numbers directly! Select Screen Select Item F1 General Help F10 Save and Exit ESC Exit v02.61 (C)Copyright 1985-2008, American Megatrends, Inc. CPU Ratio Setting [Auto] This item allows you to set the ratio between CPU Core Clock and FSB Frequency. The value is adjusted by typing the desired values using the numeric keypad and press the key. You can also use the and keys to adjust the value. To restore the default setting, type [auto] using the keyboard and press the key. If an invalid ratio is set in CMOS, then actual and setpoint values may differ. C1E Support [Enabled] Allows you to enable or disable Enhanced Halt State support. Configuration options: [Disabled] [Enabled] CPU TM function [Enabled] This function enables the overheated CPU to throttle the clock speed to cool down. Configuration options: [Disabled] [Enabled] 4-22 Chapter 4: BIOS setup

Section	Page
Contents	3
Notices	8
Safety information	9
About this guide	10
P5N64 WS Professional specifications	12
Chapter 1: Product introduction	15
1.1 Welcome!	17
1.2 Package contents	17
1.3 Special features	18
1.3.1 Product highlights	18
1.3.2 ASUS special features	21
1.3.3 ASUS Intelligent Overclocking features	24
Chapter 2: Hardware information	25
2.1 Before you proceed	27
2.2 Motherboard overview	28
2.2.1 Placement direction	28
2.2.2 Screw holes	28
2.2.3 Motherboard layout	29
2.2.4 Layout contents	30
2.3 Central Processing Unit (CPU)	32
2.3.1 Installing the CPU	33
2.3.2 Installing the CPU heatsink and fan	35
2.3.3 Uninstalling the CPU heatsink and fan	37
2.4 System memory	39
2.4.1 Overview	39
2.4.2 Memory configurations	40
2.4.3 Installing a DIMM	41
2.4.4 Removing a DIMM	41
2.5 Expansion slots	42
2.5.1 Installing an expansion card	42
2.5.2 Configuring an expansion card	42
2.5.3 Interrupt assignments	43
2.5.4 PCI slots	44
2.5.5 PCI Express x1 slot	44
2.5.6 PCI Express 2.0 x16 slots (blue)	44
2.5.7 Universal PCI Express x16 slots (black and white)	44
2.6 Jumper	46
2.7 Connectors	47
2.7.1 Rear panel connectors	47
2.7.2 Internal connectors	50
2.8 G.P. Diagnosis card installation	61
2.8.1 G.P. Diagnosis card layout	61
2.8.2 Installing G.P. Diagnosis card	61
2.8.3 G.P. Diagnosis card check codes	62
Chapter 3: Powering up	63
3.1 Starting up for the first time	65
3.2 Turning off the computer	66
3.2.1 Using the OS shut down function	66
3.2.2 Using the dual function power switch	66
Chapter 4: BIOS setup	67
4.1 Managing and updating your BIOS	69
4.1.1 ASUS Update utility	69
4.1.2 Creating a bootable floppy disk	72
4.1.3 ASUS EZ Flash 2 utility	73
4.1.4 AFUDOS utility	74
4.1.5 ASUS CrashFree BIOS 3 utility	76
4.2 BIOS setup program	77
4.2.1 BIOS menu screen	78
4.2.2 Menu bar	78
4.2.3 Navigation keys	78
4.2.4 Menu items	79
4.2.5 Sub-menu items	79
4.2.6 Configuration fields	79
4.2.7 Pop-up window	79
4.2.8 Scroll bar	79
4.2.9 General help	79
4.3 Main menu	80
4.3.1 System Time [xx:xx:xx]	80
4.3.2 System Date [Day xx/xx/xxxx]	80
4.3.3 Legacy Diskette A [1.44M, 3.5 in.]	80
4.3.4 Language [English]	80
4.3.5 Primary IDE Master/Slave	81
4.3.6 SATA 1~6	82
4.3.7 IDE Configuration	83
4.3.8 System Information	84
4.4 Ai Tweaker menu	85
4.5 Advanced menu	89
4.5.1 USB Configuration	89
4.5.2 CPU Configuration	90
4.5.3 Chipset	91
4.5.4 Onboard Devices Configuration	92
4.5.5 PCI PnP	93
4.6 Power menu	94
4.6.1 Suspend Mode [Auto]	94
4.6.2 Repost Video on S3 Resume [No]	94
4.6.3 ACPI 2.0 Support [Disabled]	94
4.6.4 ACPI APIC Support [Enabled]	94
4.6.5 APM Configuration	95
4.6.6 Hardware Monitor	96
4.7 Boot menu	98
4.7.1 Boot Device Priority	98
4.7.2 Boot Settings Configuration	99
4.7.3 Security	100
4.8 Tools menu	102
4.8.1 ASUS EZ Flash 2	102
4.8.2 Express Gate [Enabled]	103
4.8.3 ASUS O.C. Profile	103
4.8.4 Ai Net 2	105
4.9 Exit menu	106
Chapter 5: Software support	107
5.1 Installing an operating system	109
5.2 Support DVD information	109
5.2.1 Running the support DVD	109
5.2.2 Drivers menu	110
5.2.3 Utilities menu	111
5.2.4 Make Disk menu	113
5.2.5 Manual menu	114
5.2.6 ASUS Contact information	114
5.2.7 Other information	115
5.3 Software information	117
5.3.1 ASUS MyLogo2™	117
5.3.2 ASUS PC Probe II	119
5.3.3 ASUS AI Suite	125
5.3.4 ASUS EPU Utility -- AI Gear 3+	127
5.3.5 ASUS AI Nap	129
5.3.6 ASUS Q-Fan 2	130
5.3.7 ASUS AI Booster	131
5.3.8 AI Audio 2 (SoundMAX® High Definition Audio utility)	132
5.3.9 ASUS Express Gate	141
5.4 RAID configurations	148
5.4.1 RAID definitions	148
5.4.2 NVIDIA® RAID configurations	149
5.4.3 Marvell® eSATA RAID configurations	156
5.4.4 Marvell® SAS RAID configurations	162
5.5 Creating a RAID driver disk	171
5.5.1 Creating a RAID driver disk without entering the OS	171
5.5.2 Creating a SATA RAID driver disk in Windows®	171
Chapter 6: NVIDIA® SLI™ technology support	173
6.1 Overview	175
Requirements	175
6.2 Graphics card setup	176
6.2.1 Installing three SLI-ready graphics cards	176
6.2.2 Installing two SLI-ready graphics cards	179
6.2.3 Installing the device drivers	180
6.2.4 Enabling the NVIDIA® SLI™ technology in Windows®	180
Appendix: CPU features	183
A.1 Intel® EM64T	185
Using the Intel® EM64T feature	185
A.2 Enhanced Intel SpeedStep® Technology (EIST)	185
A.2.1 System requirements	185
A.2.2 Using the EIST	186
A.3 Intel® Hyper-Threading Technology	187