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CPU Ratio Setting [Auto] Allows you to adjust the ratio between CPU Core Clock and BCLK Frequency. Use the and keys to adjust the value. The valid value ranges differently according to your CPU model. C1E Support [Enabled] [Enabled] Enables the C1E support function. This item should be enabled in order to enable the Enhanced Halt Sate. [Disabled] Disables this function. Hardware Prefetcher [Enabled] [Enabled] Enables the Hardware Prefetcher function. This item should be enabled in order to enable the L2 cache (MLC) Streamer Prefetcher for tuning performance of the specific application. [Disabled] Disables this function. Adjacent Cache Line Prefetcher [Enabled] [Enabled] Enables the Adjacent Cache Line Prefetcher function. This item should be enabled in order to enable the L2 cache (MLC) Spatial Prefetcher for tuning performance of the specific application. [Disabled] Disables this function. Max CPUID Value Limit [Disabled] [Enabled] Allows legacy operating systems to boot even without support for CPUs with extended CPUID functions. [Disabled] Disables this function. Intel(R) Virtualization Tech [Enabled] [Enabled] Allows a hardware platform to run multiple operating systems separately and simultaneously, enabling one system to virtually function as several systems. [Disabled] Disables this function. CPU TM function [Enabled] [Enabled] Enables the overheated CPU to throttle its clock speed to cool down. [Disabled] Disables this function. Execute Disable Bit Capability [Enabled] [Enabled] Enables the No-Execution Page Protection Technology. [Disabled] Forces the XD feature flag to always return to zero (0). Intel(R) HT Technology [Enabled] This item appears only when you install a CPU that supports Intel Hyper-Threading Technology. [Enabled] [Disabled] Enables the Intel Hyper-Threading Technology. Only one thread per activated CPU core is enabled. Chapter 3 ASUS P7P55D-E Premium 3-23

Section	Page
P7P55D-E Premium specifications summary	12
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 Xtreme Design—Hybrid Processor	17
1.3.3 ASUS Xtreme Design—Hybrid Phase	17
1.3.4 ASUS Xtreme Design—Hybrid OS	17
1.3.5 ASUS Exclusive Features	18
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	28
2.3.3 Uninstalling the CPU heatsink and fan	29
2.4 System memory	30
2.4.1 Overview	30
2.4.2 Memory configurations	31
2.4.3 Installing a DIMM	39
2.4.4 Removing a DIMM	39
2.5 Expansion slots	40
2.5.1 Installing an expansion card	40
2.5.2 Configuring an expansion card	40
2.5.3 Interrupt assignments	41
2.5.4 PCI slots	42
2.5.5 PCI Express 2.0 x1 slots (2.5GT/s)	42
2.5.6 PCI Express 2.0 x16 slots	42
2.6 Onboard switches	44
2.7 Connectors	47
2.7.1 Rear panel connectors	47
2.7.2 Audio I/O connections	48
2.7.3 Internal connectors	51
2.7.4. ASUS Q-Connector (system panel)	61
2.8 Onboard LEDs	62
2.9 Starting up for the first time	63
2.10 Turning off the computer	63
Chapter 3: BIOS setup	65
3.1 Knowing BIOS	65
3.2 Updating BIOS	65
3.2.1 ASUS Update utility	66
3.2.2 ASUS EZ Flash 2 utility	68
3.2.3 ASUS CrashFree BIOS 3 utility	69
3.2.4 ASUS BIOS Updater	70
3.3 BIOS setup program	73
3.3.1 BIOS menu screen	73
3.3.2 Menu bar	73
3.3.3 Navigation keys	74
3.3.4 Menu items	74
3.3.5 Submenu items	74
3.3.6 Configuration fields	74
3.3.7 Pop-up window	74
3.3.8 Scroll bar	74
3.3.9 General help	74
3.4 Main menu	75
3.4.1 SATA 1-6	75
3.4.2 Storage Configuration	77
3.4.3 AHCI Configuration	77
3.4.4 System Information	78
3.5 Ai Tweaker menu	79
3.5.1 Ai Overclock Tuner [Auto]	79
3.5.2 CPU Ratio Setting [Auto]	80
3.5.3 Intel(R) SpeedStep(TM) Tech [Enabled]	80
3.5.4 Intel(R) TurboMode Tech [Enabled]	80
3.5.5 Xtreme Phase Full Power Mode [Auto]	81
3.5.6 DRAM Frequency [Auto]	81
3.5.7 QPI Frequency [Auto]	81
3.5.8. DRAM Timing Control [Auto]	81
3.5.9 CPU Differential Amplitude [Auto]	83
3.5.10 CPU Clock Skew [Auto]	83
3.5.11 CPU Voltage Mode [Offset]	83
3.5.12 IMC Voltage [Auto]	84
3.5.13 DRAM Voltage [Auto]	84
3.5.14 CPU PLL Voltage [Auto]	84
3.5.15 PCH Voltage [Auto]	85
3.5.16 DRAM DATA REF Voltage on CHA/B [Auto]	85
3.5.17 DRAM CTRL REF Voltage on CHA/B [Auto]	85
3.5.18 Load-Line Calibration [Auto]	85
3.5.19 CPU Spread Spectrum [Auto]	85
3.5.20 PCIE Spread Spectrum [Auto]	85
3.6 Advanced menu	86
3.6.1 CPU Configuration	86
3.6.2 Uncore Configuration	88
3.6.3 Onboard Devices Configuration	89
3.6.4 USB Configuration	90
3.6.5 PCIPnP	91
3.6.6 Intel VT-d [Disabled]	91
3.6.7 T.Probe [Enabled]	91
3.7 Power menu	92
3.7.1 Suspend Mode [Auto]	92
3.7.2 Repost Video on S3 Resume [No]	92
3.7.3 ACPI 2.0 Support [Disabled]	92
3.7.4 ACPI APIC Support [Enabled]	92
3.7.5 EuP Ready [Disabled]	92
3.7.6 APM Configuration	93
3.7.7 Hardware Monitor	94
3.8 Boot menu	96
3.8.1 Boot Device Priority	96
3.8.2 Boot Settings Configuration	97
3.8.3 Security	98
3.9 Tools menu	100
3.9.1 ASUS O.C. Profile	100
3.9.2 AI NET 2	101
3.9.3 ASUS EZ Flash 2	101
3.9.4 Express Gate [Auto]	102
3.9.5 ID LED [Enabled]	102
3.10 Exit menu	103
Chapter 4: Software support	105
4.1 Installing an operating system	105
4.2 Support DVD information	105
4.2.1 Running the support DVD	105
4.2.2 Obtaining the software manuals	106
4.3 Software information	107
4.3.1 ASUS PC Probe II	107
4.3.2 ASUS AI Suite	108
4.3.3 ASUS Fan Xpert	109
4.3.4 ASUS EPU-6 Engine	110
4.3.5 ASUS Express Gate SSD	111
4.3.6 VIA® High Definition Audio utility	112
4.3.7 ASUS T.Probe	113
4.4 ASUS Unique Overclocking Utility— TurboV EVO	114
4.4.1 Using ASUS TurboV	114
4.4.2 Using ASUS TurboV Auto Tuning Mode	115
4.4.3 Using ASUS Turbo Key	116
4.5 RAID configurations	117
4.5.1 RAID definitions	117
4.5.2 Installing Serial ATA hard disks	118
4.5.3 Setting the RAID item in BIOS	118
4.5.4 Intel® Matrix Storage Manager option ROM utility	118
4.6 Creating a RAID driver disk	122
4.6.1 Creating a RAID driver disk without entering the OS	122
4.6.2 Creating a RAID driver disk in Windows®	122
4.6.3 Installing the RAID driver during Windows® OS installation	123
4.6.4 Using a USB floppy disk drive	123
Chapter 5: Multiple GPU technology support	127
5.1 ATI® CrossFireX™ technology	127
5.1.1 Requirements	127
5.1.2 Before you begin	127
5.1.3 Installing two CrossFireX™ graphics cards	127
5.1.4 Installing the device drivers	128
5.1.5 Enabling the ATI® CrossFireX™ technology	129
5.2 NVIDIA® SLI™ technology	130
5.2.1 Requirements	130
5.2.2 Installing two SLI-ready graphics cards	130
5.2.3 Installing the device drivers	131