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Asus P7H55 USB3 User Guide - Page 58

Intel VT-d Conﬁguration [Disabled]

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USB Functions [Enabled] [Enabled] Enables the USB Host Controllers. [Disabled] Disables the controllers. The following items appear only when you set USB Support to [Enabled]. Legacy USB Support [Auto] [Disabled] Disables the function. [Enabled] Enables the support for USB devices on legacy operating systems (OS). [Auto] Allows the system to detect the presence of USB devices at startup. If detected, the USB controller legacy mode is enabled. If no USB device is detected, the legacy USB support is disabled. BIOS EHCI Hand-off [Enabled] [Disabled] Disables the function. [Enabled] Enables the support for operating systems without an EHCI hand‑off feature. 2.5.5 PCIPnP The PCIPnP menu items allow you to change the advanced settings for PCI/PnP devices. Plug And Play O/S [No] [Yes] When set to [Yes] and if you install a Plug and Play operating system, the operating system configures the Plug and Play devices not required for boot. [No] When set to [No], BIOS configures all the devices in the system. 2.5.6 [Disabled] [Enabled] Intel VT-d Configuration [Disabled] Disables the Intel Virtualization Technology for Directed I/O. Enables the Intel Virtualization Technology for Directed I/O. 2-18 Chapter 2: BIOS information

Section	Page
P7H55/USB3 specifications summary	9
Chapter 1: Product introduction	13
1.1 Before you proceed	13
1.2 Motherboard overview	14
1.2.1 Motherboard layout	14
1.2.2 Layout contents	14
1.3 Central Processing Unit (CPU)	15
1.3.1 Installing the CPU	15
1.3.2 Installing the CPU heatsink and fan	18
1.3.3 Uninstalling the CPU heatsink and fan	19
1.4 System memory	20
1.4.1 Overview	20
1.4.2 Memory configurations	21
1.4.3 Installing a DIMM	28
1.4.4 Removing a DIMM	28
1.5 Expansion slot	29
1.5.1 Installing an expansion card	29
1.5.2 Configuring an expansion card	29
1.5.3 PCI slots	29
1.5.4 PCI Express x1 slots	29
1.5.5 PCI Express 2.0 x16 slots	29
1.6 Jumpers	30
1.7 Onboard switches	31
1.8 Connectors	33
1.8.1 Rear panel connectors	33
1.8.2 Internal connectors	34
1.9 Installing an operating system	40
1.10 Support DVD information	40
1.10.1 Running the support DVD	40
Chapter 2: BIOS setup	41
2.1 Managing and updating your BIOS	41
2.1.1 ASUS Update	41
2.1.2 ASUS EZ Flash 2	42
2.1.3 ASUS CrashFree BIOS 3 utility	43
2.2 BIOS setup program	44
2.3 Main menu	44
2.3.1 SATA 1-6	45
2.3.2 Storage Configuration	46
2.3.3 AHCI Configuration	46
2.3.4 System Information	47
2.4 Ai Tweaker menu	48
2.4.1 CPU Level Up [Auto]	48
2.4.2 Ai Overclock Tuner [Auto]	49
2.4.3 CPU Ratio Setting [Auto]	49
2.4.4 Intel(R) SpeedStep(TM) Tech [Enabled]	50
2.4.5 Intel(R) TurboMode Tech [Enabled]	50
2.4.6 Xtreme Phase Full Power Mode [Auto]	50
2.4.7 DRAM Frequency [Auto]	50
2.4.8 QPI Frequency [Auto]	50
2.4.9 ASUS/3rd Party UI Priority [ASUS Utility]	50
2.4.10 OC Tuner [Turbo Profile]	51
2.4.11 Start auto tuning	51
2.4.12 DRAM Timing Control [Auto]	51
2.4.13 CPU Differential Amplitude [Auto]	53
2.4.14 CPU Clock Skew [Auto]	53
2.4.15 CPU Voltage Mode [Offset]	53
2.4.16 IMC Voltage [Auto]	53
2.4.17 DRAM Voltage [Auto]	53
2.4.18 CPU PLL Voltage [Auto]	54
2.4.19 PCH Voltage [Auto]	54
2.4.20 DRAM DATA REF Voltage on CHA/B [Auto]	54
2.4.21 Load-Line Calibration [Auto]	54
2.4.22 CPU Spread Spectrum [Auto]	54
2.4.23 PCIE Spread Spectrum [Auto]	54
2.5 Advanced menu	55
2.5.1 CPU Configuration	55
2.5.2 Uncore Configuration	57
2.5.3 Onboard Device Configuration	57
2.5.4 USB Configuration	57
2.5.5 PCIPnP	58
2.5.6 Intel VT-d Configuration [Disabled]	58
2.6 Power menu	59
2.6.1 Suspend Mode [Auto]	59
2.6.2 Repost Video on S3 Resume [No]	59
2.6.3 ACPI 2.0 Support [Disabled]	59
2.6.4 ACPI APIC Support [Enabled]	59
2.6.5 EuP Ready [Disabled]	59
2.6.6 APM Configuration	60
2.6.7 Hardware Monitor	61
2.7 Boot menu	62
2.7.1 Boot Device Priority	62
2.7.2 Boot Settings Configuration	62
2.7.3 Security	63
2.8 Tools menu	65
2.8.1 ASUS O.C. Profile	65
2.8.2 AI NET 2	65
2.8.3 ASUS EZ Flash 2	66
2.8.4 Express Gate [Auto]	66