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P8B75-M LE 1 2 3 1 20.3cm(8.0in) KBMS ASM HDMI 1442 DIGI +VRM ATX12V CPU_FAN DVI_VGA LGA1155 USB34 USB3_12 4 5 6 MemOK! DRAM_LED 2 DDR3 DIMM_A1 (64bit, 240-pin module) DDR3 DIMM_A2 (64bit, 240-pin module) 24.4cm(9.6in) EATXPWR LAN_USB12 USB3_34 RTL 8111F Lithium Cell CMOS Power 7 AUDIO CHA_FAN PCIEX16_1 P8B75-M LE SATA3G_3 SATA3G_1 SATA3G_4 SATA3G_2 Super I/O VIA VT1708S AAFP SPDIF_OUT COM1 PCI1 PCI2 PCIEX16_2 LPT CLRTC Intel® B75 8 64Mb BIOS 64Mb BIOS SATA3G_5 USB78 USB56 SB_PWR SATA6G_1 9 SPEAKER F_PANEL 1.5.4 18 17 16 15 14 Layout contents 13 12 11 10 Connectors/Jumpers/Slots/LED 1. CPU and chassis fan connectors (4-pin CPU_FAN, 3-pin CHA_FAN) 2. ATX power connectors (24-pin EATXPWR, 4-pin ATX12V) 3. Intel® LGA1155 CPU socket Page Connectors/Jumpers/Slots/LED 1-26 10. Intel® B75 Serial ATA 6.0Gb/s connectors (7-pin SATA6G_1 [gray]) 1-25 11. System panel connector (10-1 pin F_PANEL) Page 1-28 1-27 1-9 12. Speaker connector (4-pin SPEAKER) 1-27 4. DDR3 DIMM slots 1-14 13. USB 2.0 connectors (10-1 pin USB56, USB78) 1-29 5. DRAM LED (DRAM_LED) 1-31 14 Clear RTC RAM (3-pin CLRTC) 1-21 6. MemOK! switch 1-30 15. LPT connector (26-1 pin LPT) 1-26 7. USB 3.0 connector (20-1 pin USB3_34) 1-29 16. Digital audio connector (4-1 pin SPDIF_OUT) 1-24 8. Intel® B75 Serial ATA 3.0Gb/s connectors (7-pin 1-28 17. Serial port connector (10-1 pin COM1) 1-25 SATA3G_1~5 [blue]) 9. Onboard LED (SB_PWR) 1-31 18 Front panel audio connector (10-1 pin AAFP) 1-24 1-8 Chapter 1: Product introduction

Section	Page
Safety information	6
About this guide	6
P8B75-M LE Series specifications summary	8
Chapter 1	11
Product introduction	11
1.1 Welcome!	11
1.2 Package contents	11
1.3 Special features	11
1.3.1 Product highlights	11
1.3.2 Innovative ASUS features	13
1.4 Before you proceed	15
1.5 Motherboard overview	16
1.5.1 Placement direction	16
1.5.2 Screw holes	16
1.5.3 Motherboard layout	17
1.5.4 Layout contents	18
1.6 Central Processing Unit (CPU)	19
1.6.1 Installing the CPU	20
1.6.2 CPU heatsink and fan assembly installation	22
1.7 System memory	24
1.7.1 Overview	24
1.7.2 Memory configurations	24
1.7.3 Installing a DIMM	29
1.7.4 Removing a DIMM	29
1.8 Expansion slots	30
1.8.1 Installing an expansion card	30
1.8.2 Configuring an expansion card	30
1.8.3 PCI slots	30
1.8.4 PCI Express x4 slot	30
1.8.5 PCI Express 3.0/2.0 x16 slot	30
1.9 Jumpers	31
1.10 Connectors	32
1.10.1 Rear panel connectors	32
1.10.2 Internal connectors	34
1.11 Onboard switches	40
1.12 Onboard LEDs	41
1.13 Software support	42
1.13.1 Installing an operating system	42
1.13.2 Support DVD information	42
1.13.3 Intel® SBA support	43
Chapter 2	45
BIOS information	45
2.1 Managing and updating your BIOS	45
2.1.1 ASUS Update utility	45
2.1.2 ASUS EZ Flash 2	46
2.1.3 ASUS CrashFree BIOS 3 utility	47
2.1.4 ASUS BIOS Updater	48
2.2 BIOS setup program	50
2.3 Main menu	54
2.3.1 System Language [English]	54
2.3.2 System Date [Day xx/xx/xxxx]	54
2.3.3 System Time [xx:xx:xx]	54
2.3.4 Security	54
2.4 Ai Tweaker menu	56
2.4.1 CPU bus speed: DRAM speed ratio mode [Auto]	56
2.4.2 Memory Frequency [Auto]	57
2.4.3 iGPU Max. Frequency [Auto]	57
2.4.4 EPU Power Saving Mode [Disabled]	57
2.4.5 GPU Boost [OK]	57
2.4.6 DRAM Timing Control	57
2.4.7 CPU Power Management	57
2.4.8 DIGI+ VRM	58
2.4.9 CPU Voltage [Offset Mode]	59
2.4.10 iGPU Voltage [Offset Mode]	60
2.4.11 DRAM Voltage [Auto]	60
2.4.12 VCCSA Voltage [Auto]	60
2.4.13 VCCIO Voltage [Auto]	60
2.4.14 PCH Voltage [Auto]	60
2.4.15 CPU PLL Voltage [Auto]	60
2.5 Advanced menu	61
2.5.1 CPU Configuration	61
2.5.2 PCH Configuration	62
2.5.3 SATA Configuration	63
2.5.4 System Agent Configuration	64
2.5.5 AMT Configuration	64
2.5.6 USB Configuration	65
2.5.7 Onboard Devices Configuration	65
2.5.8 APM	66
2.5.9 Network Stack	67
2.6 Monitor menu	68
2.6.1 CPU Temperature / MB Temperature [xxxºC/xxxºF]	69
2.6.2 CPU / Chassis Fan Speed [xxxx RPM] or [Ignore] / [N/A]	69
2.6.3 CPU Q-Fan Control [Enabled]	69
2.6.4 Chassis Q-Fan Control [Enabled]	70
2.6.5 CPU Voltage, 3.3V Voltage, 5V Voltage, 12V Voltage	70
2.6.6 Anti Surge Support [Enabled]	70
2.7 Boot menu	71
2.7.1 Bootup NumLock State [On]	71
2.7.2 Full Screen Logo [Enabled]	71
2.7.3 Wait for ‘F1’ If Error [Enabled]	71
2.7.4 Option ROM Messages [Force BIOS]	72
2.7.5 Setup Mode [EZ Mode]	72
2.7.6 UEFI/Legacy Boot [Enabled both UEFI and Legacy]	72
2.7.7 PCI ROM Priority [Legacy ROM]	72
2.7.8 Boot Option Priorities	72
2.7.9 Boot Override	72
2.8 Tools menu	73
2.8.1 ASUS EZ Flash 2 Utility	73
2.8.2 ASUS O.C. Profile	73
2.8.3 ASUS SPD Information	73
2.9 Exit menu	74
Appendices	75
Notices	75

Match case Limit results 1 per page

1-8

Chapter 1: Product introduction

1.5.4

Layout contents

Connectors/Jumpers/Slots/LED

Page

Connectors/Jumpers/Slots/LED

Page

CPU and chassis fan connectors (4-pin

CPU_FAN, 3-pin CHA_FAN)

1-26

10.

Intel

B75 Serial ATA 6.0Gb/s connectors

(7-pin SATA6G_1 [gray])

1-28

ATX power connectors (24-pin EATXPWR,

4-pin ATX12V)

1-25

11.

System panel connector (10-1 pin F_PANEL)

1-27

Intel

LGA1155 CPU socket

1-9

12.

Speaker connector (4-pin SPEAKER)

1-27

DDR3 DIMM slots

1-14

13.

USB 2.0 connectors (10-1 pin USB56, USB78)

1-29

DRAM LED (DRAM_LED)

1-31

Clear RTC RAM (3-pin CLRTC)

1-21

MemOK! switch

1-30

15.

LPT connector (26-1 pin LPT)

1-26

USB 3.0 connector (20-1 pin USB3_34)

1-29

16.

Digital audio connector (4-1 pin SPDIF_OUT)

1-24

Intel

B75 Serial ATA 3.0Gb/s connectors (7-pin

SATA3G_1~5 [blue])

1-28

17.

Serial port connector (10-1 pin COM1)

1-25

Onboard LED (SB_PWR)

1-31

Front panel audio connector (10-1 pin AAFP)

1-24

P8B75-M LE

PCIEX16_1

PCIEX16_2

PCI2

PCI1

AAFP

EATXPWR

CPU_FAN

CHA_FAN

Lithium Cell

CMOS Power

Super

I/O

VIA

VT1708S

DIGI

+VRM

ATX12V

KBMS

HDMI

64Mb

BIOS

64Mb

BIOS

CLRTC

20.3cm(8.0in)

24.4cm(9.6in)

Intel

B75

DDR3 DIMM_A1 (64bit, 240-pin module)

DDR3 DIMM_A2 (64bit, 240-pin module)

SATA6G_1

SATA3G_5

SATA3G_1

SATA3G_2

SATA3G_3

SATA3G_4

AUDIO

USB34

USB3_12

ASM

1442

LAN_USB12

SPDIF_OUT

DVI_VGA

DRAM_LED

MemOK!

LGA1155

USB3_34

F_PANEL

SPEAKER

RTL

8111F

COM1

LPT

USB78

USB56

SB_PWR

P8B75-M LE