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2.6 Jumpers 1. Clear RTC RAM (CLRTC) This jumper allows you to clear the Real Time Clock (RTC) RAM in CMOS. You can clear the CMOS memory of date, time, and system setup parameters by erasing the CMOS RTC RAM data. The onboard button cell battery powers the RAM data in CMOS, which include system setup information such as system passwords. To erase the RTC RAM: 1. Turn OFF the computer and unplug the power cord. 2. Move the jumper cap from pins 1-2 (default) to pins 2-3. Keep the cap on pins 2-3 for about 5~10 seconds, then move the cap back to pins 1-2. 3. Plug the power cord and turn ON the computer. 4. Hold down the key during the boot process and enter BIOS setup to re-enter data. Except when clearing the RTC RAM, never remove the cap on CLRTC jumper default position. Removing the cap will cause system boot failure! If the steps above do not help, remove the onboard battery and move the jumper again to clear the CMOS RTC RAM data. After the CMOS clearance, reinstall the battery. ® P5E3 PREMIUM CLRTC 12 23 P5E3 Premium/WiFi-AP @n Normal (Default) Clear RTC Clear RTC RAM • 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. • Due to the chipset behavior, AC power off is required to enable C.P.R. function. You must turn off and on the power supply or unplug and plug the power cord before rebooting the system. 2-22 Chapter 2: Hardware information

Section	Page
Contents	3
Notices	8
Safety information	9
About this guide	10
P5E3 Premium/WiFi-AP @n specifications summary	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 AI Lifestyle unique features	20
1.3.3 ASUS Intelligent Performance and 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	39
2.4.3 Installing a DIMM	43
2.4.4 Removing a DIMM	43
2.5 Expansion slots	44
2.5.1 Installing an expansion card	44
2.5.2 Configuring an expansion card	44
2.5.3 Interrupt assignments	45
2.5.4 PCI slots	46
2.5.5 PCI Express x1 slot	46
2.5.6 PCI Express 2.0 x16 slots (blue)	46
2.5.7 Universal PCI Express x16 slot (black)	46
2.5.8 AI Slot Detector	47
2.6 Jumpers	48
2.7 Connectors	50
2.7.1 Rear panel connectors	50
2.7.2 Internal connectors	53
2.7.3 Installing the optional fans	65
Chapter 3: Powering up	67
3.1 Starting up for the first time	69
3.2 Turning off the computer	70
3.2.1 Using the OS shut down function	70
3.2.2 Using the dual function power switch	70
Chapter 4: BIOS setup	71
4.1 Managing and updating your BIOS	73
4.1.1 ASUS Update utility	73
4.1.2 ASUS EZ Flash 2 utility	76
4.1.3 AFUDOS utility	77
4.1.4 ASUS CrashFree BIOS 3 utility	79
4.2 BIOS setup program	80
4.2.1 BIOS menu screen	81
4.2.2 Menu bar	81
4.2.3 Navigation keys	81
4.2.4 Menu items	82
4.2.5 Sub-menu items	82
4.2.6 Configuration fields	82
4.2.7 Pop-up window	82
4.2.8 Scroll bar	82
4.2.9 General help	82
4.3 Main menu	83
4.3.1 System Time [xx:xx:xx]	83
4.3.2 System Date [Day xx/xx/xxxx]	83
4.3.3 Legacy Diskette A [1.44M, 3.5 in.]	83
4.3.4 Language [English]	83
4.3.5 SATA 1-6	84
4.3.6 SATA Configuration	85
4.3.7 AHCI Configuration	86
4.3.8 System Information	87
4.4 Ai Tweaker menu	88
4.4.1 Ai Overclock Tuner [Auto]	88
4.4.2 CPU Ratio Control [Auto]	89
4.4.3 FSB Strap to North Bridge [Auto]	89
4.4.4 DRAM Frequency [Auto]	90
4.4.5 DRAM Command Rate [Auto]	90
4.4.6 DRAM CMD Skew on Channel A/B [Auto]	91
4.4.7 DRAM CLK Skew on Channel A/B [Auto]	91
4.4.8 DRAM Timing Control [Auto]	91
4.4.9 DRAM Static Read Control [Auto]	93
4.4.10 DRAM Dynamic Write Control [Auto]	93
4.4.11 Ai Clock Twister [Auto]	93
4.4.12 Ai Transaction Booster [Auto]	93
4.4.13 CPU Voltage [Auto]	93
4.4.14 CPU GTL Voltage Reference (0/2) [Auto]	94
4.4.15 CPU GTL Voltage Reference (1/3) [Auto]	94
4.4.16 CPU PLL Voltage [Auto]	94
4.4.17 FSB Termination Voltage [Auto]	94
4.4.18 DRAM Voltage [Auto]	94
4.4.19 NB Voltage [Auto]	94
4.4.20 NB GTL Voltage Reference [Auto]	95
4.4.21 SB Voltage [Auto]	95
4.4.22 Clock Over-Charging Voltage [Auto]	95
4.4.23 Load-Line Calibration [Auto]	95
4.4.24 CPU Spread Spectrum [Auto]	95
4.4.25 PCIE Spread Spectrum [Auto]	95
4.5 Advanced menu	96
4.5.1 CPU Configuration	96
4.5.2 Chipset	98
4.5.3 Onboard Device Configuration	99
4.5.4 USB Configuration	100
4.5.5 PCIPnP	101
4.6 Power menu	102
4.6.1 Suspend Mode [Auto]	102
4.6.2 Repost Video on S3 Resume [Disabled]	102
4.6.3 ACPI 2.0 Support [Disabled]	102
4.6.4 ACPI APIC Support [Enabled]	102
4.6.5 APM Configuration	103
4.6.6 Hardware Monitor	104
4.7 Boot menu	107
4.7.1 Boot Device Priority	107
4.7.2 Boot Settings Configuration	108
4.7.3 Security	109
4.8 Tools menu	111
4.8.1 ASUS EZ Flash 2	111
4.8.2 ASUS Express Gate	112
4.8.3 ASUS O.C. Profile	113
4.8.4 Ai Net 2	114
4.9 Exit menu	115
Chapter 5: Software support	117
5.1 Installing an operating system	119
5.2 Support DVD information	119
5.2.1 Running the support DVD	119
5.2.2 Drivers menu	120
5.2.3 Utilities menu	121
5.2.4 Make disk menu	123
5.2.5 Manual menu	124
5.2.6 ASUS Contact information	124
5.2.7 Other information	125
5.3 Software information	127
5.3.1 ASUS MyLogo3™	127
5.3.2 AI NET2	129
5.3.3 ASUS PC Probe II	130
5.3.4 ASUS AI Suite	136
5.3.5 ASUS EPU Utility -- AI Gear 3+	138
5.3.6 ASUS AI Nap	140
5.3.7 ASUS Q-Fan 2	141
5.3.8 ASUS AI Booster	142
5.3.9 ASUS AI Direct Link	143
5.3.10 AI Audio 2 (SoundMAX® High Definition Audio utility)	145
5.3.11 ASUS Express Gate	154
5.4 RAID configurations	161
5.4.1 RAID definitions	161
5.4.2 Installing Serial ATA hard disks	162
5.4.3 Intel® RAID configurations	162
5.4.4 JMicron® RAID Configuration	170
5.5 Creating a RAID driver disk	178
5.5.1 Creating a RAID driver disk without entering the OS	178
5.5.2 Creating a RAID driver disk in Windows®	178
Chapter 6: ATI® CrossFire™ technology support	181
6.1 Overview	183
6.1.1 Requirements	183
6.1.2 Before you begin	183
6.2 Installing CrossFire™ graphics cards	184
6.3 Software information	187
6.3.1 Installing the device drivers	187
6.3.2 Using the Catalyst™ Control Center	189
Appendix: CPU features	195
A.1 Intel® EM64T	197
Using the Intel® EM64T feature	197
A.2 Enhanced Intel SpeedStep® Technology (EIST)	197
A.2.1 System requirements	197
A.2.2 Using the EIST	198
A.3 Intel® Hyper-Threading Technology	199