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Asus M4A78-E User Manual - Page 42

CPU overvoltage setting 3-pin OV_CPU

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2. CPU overvoltage setting (3-pin OV_CPU) This jumper allows you to enable or disable the advanced CPU overvoltage setting in BIOS. Read the following information before you change the jumper setting. Set to pins 1-2 to activate the advanced CPU overvoltage feature. Chapter 2 Pins 2-3 (Default) Pins 1-2 (OV Enabled) OV_CPU 0.80V - 1.70V up to 1.90V • Before you change the jumper setting for extra-high overvoltage ability, use the BIOS items introduced in 3.5 Ai Tweaker menu first to adjust the desired CPU performance. Ensure that your system functions well under the highest BIOS voltage setting before you change the setting of this jumper. • Refer to 3.5 Ai Tweaker menu for more information about the CPU overvoltage setting. • DO NOT set the OV_CPU jumper to pins 1-2 when you install a new CPU and have not booted for the first time. Doing so may cause the system to halt. For system failure due to the wrong setting of the OV_CPU jumper, shut down the computer and move the cap back to pins 2-3. • The system may need a better cooling system (for example, a water-cooling system) to work stably under high voltage settings. 2-22 Chapter 2: Hardware information

Section	Page
Contents	3
Notices	7
Safety information	8
About this guide	9
M4A78-E specifications summary	11
Chapter 1: Product introduction	15
1.1 Welcome!	15
1.2 Package contents	15
1.3 Special features	16
1.3.1 Product highlights	16
1.3.2 ASUS unique features	17
1.3.3 ASUS intelligent performance and overclocking features	19
Chapter 2: Hardware information	21
2.1 Before you proceed	21
2.2 Motherboard overview	22
2.2.1 Motherboard layout	22
2.2.2 Layout contents	23
2.2.3 Placement direction	24
2.2.4 Screw holes	24
2.3 Central Processing Unit (CPU)	25
2.3.1 Installing the CPU	25
2.3.2 Installing the CPU heatsink and fan	27
2.4 System memory	30
2.4.1 Overview	30
2.4.2 Memory configurations	31
2.4.3 Installing a DIMM	36
2.4.4 Removing a DIMM	36
2.5 Expansion slots	37
2.5.1 Installing an expansion card	37
2.5.2 Configuring an expansion card	37
2.5.3 Interrupt assignments	38
2.5.4 PCI slots	39
2.5.5 PCI Express x1 slots	39
2.5.6 Two PCI Express x16 slots	39
2.6 ASUS VGA SWITCH CARD	40
2.7 Jumpers	41
2.8 Connectors	43
2.8.1 Rear panel connectors	43
2.8.2 Audio I/O connections	44
2.8.3 Internal connectors	47
2.9 Starting up for the first time	58
2.10 Turning off the computer	58
Chapter 3: BIOS setup	59
3.1 Knowing BIOS	59
3.2 Updating BIOS	59
3.2.1 ASUS Update utility	60
3.2.2 Creating a bootable floppy disk	62
3.2.3 ASUS EZ Flash 2 utility	63
3.2.4 ASUS CrashFree BIOS 3 utility	64
3.3 BIOS setup program	65
3.3.1 BIOS menu screen	65
3.3.2 Menu bar	65
3.3.3 Navigation keys	66
3.3.4 Menu items	66
3.3.5 Submenu items	66
3.3.6 Configuration fields	66
3.3.7 Pop-up window	66
3.3.8 Scroll bar	66
3.3.9 General help	66
3.4 Main menu	67
3.4.1 Primary IDE Master/Slave; SATA 1–5; ESATA	67
3.4.2 Storage Configuration	69
3.4.3 System Information	70
3.5 Ai Tweaker menu	70
3.5.1 AI Overclocking Tuner [Auto]	70
3.5.2 CPU Ratio [Auto]	71
3.5.3 CPU Bus Frequency [XXX]	71
3.5.4 PCIE Frequency [XXX]	71
3.5.5 DRAM Frequency Control [Auto]	71
3.5.6 CPU/NB Frequency [Auto]	71
3.5.7 HT Link Speed [Auto]	71
3.5.8 Memory Configuration	72
3.5.9 DRAM Timing Configuration	73
3.5.10 CPU Voltage [Auto]	74
3.5.11 CPU/NB Voltage [Auto]	75
3.5.12 CPU VDDA Voltage [Auto]	75
3.5.13 DRAM Voltage [Auto]	75
3.5.14 HT Voltage [Auto]	75
3.5.15 NB Voltage [Auto]	75
3.5.16 NB 1.8V Voltage [Auto]	75
3.5.17 SB Voltage [Auto]	75
3.5.18 CPU Spread Spectrum [Enabled]	75
3.5.19 PCIE Spread Spectrum [Enabled]	75
3.6 Advanced menu	76
3.6.1 CPU Configuration	76
3.6.2 Chipset	77
3.6.3 Onboard Devices Configuration	81
3.6.4 USB Configuration	82
3.6.5 PCIPnP	83
3.7 Power menu	84
3.7.1 Suspend Mode [Auto]	84
3.7.2 ACPI 2.0 Support [Disabled]	84
3.7.3 ACPI APIC Support [Enabled]	84
3.7.4 APM Configuration	85
3.7.5 Hardware Monitor	86
3.8 Boot menu	87
3.8.1 Boot Device Priority	87
3.8.2 Boot Settings Configuration	88
3.8.3 Security	89
3.9 Tools menu	91
3.9.1 ASUS EZ Flash 2	91
3.9.2 Express Gate	92
3.9.3 ASUS O.C. Profile	93
3.9.4 AI NET 2	94
3.10 Exit menu	95
Chapter 4: Software support	97
4.1 Installing an operating system	97
4.2 Support DVD information	97
4.2.1 Running the support DVD	97
4.2.2 Obtaining the software manuals	98
4.3 Software information	99
4.3.1 Cool ‘n’ Quiet!™ Technology	99
4.3.2 Audio configurations	100
4.3.3 ASUS PC Probe II	101
4.3.4 ASUS Express Gate SSD / ASUS Express Gate	102
4.3.5 ASUS AI Suite	103
4.3.6 ASUS EPU	104
4.3.7 ASUS Q-Fan 2	105
4.3.8 ASUS AI Nap	106
4.3.9 ASUS TurboV	107
4.3.10 ASUS Turbo Key	108
4.4 RAID configurations	109
4.4.1 RAID definitions	109
4.4.2 Installing Serial ATA hard disks	110
4.4.3 Setting the RAID item in BIOS	110
4.4.4 AMD® Option ROM Utility®	111
4.5 Creating a RAID driver disk	114
4.5.1 Creating a RAID driver disk without entering the OS	114
4.5.2 Creating a RAID/SATA driver disk in Windows®	114
Chapter 5: ATI® CrossFireX™ technology support	115
5.1 ATI® CrossFireX™ technology	115
5.1.1 Requirements	115
5.1.2 Before you begin	115
5.1.3 Installing CrossFireX™ graphics cards	116
5.1.4 Installing the device drivers	117
5.1.5 Enabling the ATI® CrossFireX™ technology	117
5.2 ATI® Hybrid CrossFireX™	119
5.2.1 System requirements	119
5.2.2 Before you proceed	119
5.2.3 Installing AMD Chipset Driver	120