Asus Crosshair II Formula: Hardware

This chapter lists the hardware setup

procedures that you have to perform

when installing system components. It

includes description of the jumpers and

connectors on the motherboard.

Hardware

2

information

2.3 Central Processing Unit (CPU)

The motherboard comes with a 940-pin AM2 socket designed for the AMD

Athlon™ 64 X2/Athlon™ 64/Athlon™ FX/Sempron™ processor.

The AM2 socket has a different pinout from the 940-pin socket designed for the

AMD Opteron™ processor. Make sure you use a CPU is designed for the AM2

socket. The CPU ts in only one correct orientation. DO NOT force the CPU into

the socket to prevent bending the connectors on the socket and damaging the

CPU!

2.3.1 Installing the CPU

To install a CPU:

1. Locate the CPU socket on the motherboard.

2. Unlock the socket by pressing the

lever sideways, then lift it up to a

90º angle.

Socket lever

Make sure that the socket lever is lifted up to 90º angle; otherwise, the CPU will

not t in completely.

2-6 Chapter 2: Hardware information

3. Position the CPU above the socket

such that the CPU corner with the

gold triangle matches the socket

corner with a small triangle.

4. Carefully insert the CPU into the

socket until it ts in place.

Gold triangle

Small triangle

5. When the CPU is in place, push

down the socket lever to secure the

CPU. The lever clicks on the side tab

to indicate that it is locked.

6. Install a CPU heatsink and fan

following the instructions that came

with the heatsink package.

ASUS Crosshair 2-7

2.3.2 Installing the heatsink and fan

The AMD Athlon™ 64FX/Athlon™ 64/Athlon™ 64 X2/Sempron™ processor

requires a specially designed heatsink and fan assembly to ensure optimum

thermal condition and performance.

Make sure that you use only AMD-certied heatsink and fan assembly.

To install the CPU heatsink and fan:

1. Place the heatsink on top of the installed CPU, making sure that the heatsink

ts properly on the retention module base.

•

The retention module base is already installed on the motherboard

upon purchase.

•

You do not have to remove the retention module base when

installing the CPU or installing other motherboard components.

•

If you purchased a separate CPU heatsink and fan assembly, make

sure that a Thermal Interface Material is properly applied to the CPU

heatsink or CPU before you install the heatsink and fan assembly.

CPU fan

CPU heatsink

Retention bracket lock

Retention bracket

Retention module base

Your boxed CPU heatsink and fan assembly should come with installation

instructions for the CPU, heatsink, and the retention mechanism. If the

instructions in this section do not match the CPU documentation, follow the

latter.

2-8 Chapter 2: Hardware information

2. Attach one end of the retention bracket

to the retention module base.

3. Align the other end of the retention

bracket (near the retention bracket

lock) to the retention module base.

A clicking sound denotes that the

retention bracket is in place.

Make sure that the fan and

heatsink assembly perfectly ts

the retention mechanism module

base, otherwise you cannot snap

the retention bracket in place.

4. Push up the retention bracket lock on

the retention mechanism to secure the

heatsink and fan to the module base.

ASUS Crosshair

2-9

5. When the fan and heatsink assembly is in place, connect the CPU fan cable

to the connector on the motherboard labeled CPU_FAN.

Do not forget to connect the CPU fan connector! Hardware monitoring errors

can occur if you fail to plug this connector.

2-10

Chapter 2: Hardware information

2.3.3 Installing the optional fan

Install the optional fan only if you are using a passive cooler or a water cooler.

Installing the optional fan with an active CPU cooler will interfere with the airow

and destabilize the system.

1. Position the fan above the pipe

2. Fit the grooved edge to the

and heatsink assembly.

heatsink.

3. Carefully push down the fan until

4. The above photo shows the fans

it snugly ts the heatsink, then

installed on the motherboard.

connect the fan cables.

•

Plug the optional fan cables to any of the OPT FAN1~5 connectors on the

motherboard.

•

Make sure the optional fan is installed correctly to prevent damage to the

fan and motherboard components.

ASUS Crosshair

2-11

2.4 System memory

2.4.1 Overview

The motherboard comes with four Double Data Rate 2 (DDR2) Dual Inline Memory

Modules (DIMM) sockets.

A DDR2 module has the same physical dimensions as a DDR DIMM but has a

240-pin footprint compared to the 184-pin DDR DIMM. DDR2 DIMMs are notched

differently to prevent installation on a DDR DIMM socket.

The gure illustrates the location of the DDR2 DIMM sockets:

Channel Sockets

Channel A DIMM_A1 and DIMM_A2

Channel B DIMM_B1 and DIMM_B2

2-12

Chapter 2: Hardware information

2.4.2 Memory congurations

You may install 256 MB, 512 MB, 1 GB, and 2 GB unbuffered ECC/non-ECC

DDR2 DIMMs into the DIMM sockets.

®

• If you installed Windows

XP 32-bit version operating system, we

®

recommend that you install less than 3 GB of total memory. For Windows

XP 64-bit version operating system, the maxium support is 8 GB of total

memory.

• For dual-channel conguration, the total size of memory module(s) installed

per channel must be the same (DIMM_A1 + DIMM_A2 = DIMM_B1 +

DIMM_B2).

• Always install DIMMs with the same CAS latency. For optimum

compatibility, we recommend that you obtain memory modules from the

same vendor. Refer to the DDR2 Qualied Vendors List on the next page

for details.

Qualied Vendors Lists (QVL)

DDR2-800 MHz capability

Qualied Vendors List (QVL) Standard table for user manual

DIMM Support

Chip

SS/

Size Vendor Chip No. CL

Brand

DS Part No.

A* B* C*

512MB KINGSTON Heat-Sink Package N/A N/A SS KHX6400D2/512

512MB KINGSTON K4T51083QC N/A N/A SS KVR800D2N5/512 V V V

1024MB KINGSTON K4T51083QC N/A N/A DS KVR800D2N5/1G V

256MB SAMSUNG K4T56083QF-ZCE7 N/A N/A SS M378T3253FZ3-CE7

256MB SAMSUNG K4T56083QF-ZCE7(ECC) N/A N/A SS M391T3253FZ3-CE7 V V V

512MB SAMSUNG EDD339XX N/A N/A SS M378T6553CZ3-CE7

512MB Inneon HYB18T256800AF25 N/A N/A DS HYS64T64520HU-2.5-A V V

512MB Inneon HYB18T256800AF25F N/A N/A DS HYS64T64020HU-25F-A V V

512MB Hynix HY5PS12821BFP-S5 N/A N/A SS HYMP564U64BP8-S5 V V

1024MB Hynix HY5PS12821BFP-S5 N/A N/A DS HYMP512U64BP8-S5 V V

512MB MICRON 5JAIIZ9DQQ N/A N/A SS MT8HTF6464AY-80EA3 V V V

1024MB MICRON 5JAIIZ9DQQ N/A N/A DS MT16HTF12864AY-80EA3 V V V

512MB MICRON 5ZD22D9GKX N/A N/A SS MT8HTF6464AY-80ED4 V V V

1024MB MICRON 5ZD22D9GKX N/A N/A DS MT16HTF12864AY-80ED4 V V

512MB MICRON 6CD22D9GKX N/A N/A SS MT8HTF6464AY-80ED4 V V

1024MB MICRON 6CD22D9GKX N/A N/A DS MT16HTF12864AY-80ED4 V V

512MB CORSAIR Heat-Sink Package N/A N/A SS CM2X512A-6400

1024MB CORSAIR Heat-Sink Package N/A N/A DS CM2X1024-6400PRO

1024MB CORSAIR Heat-Sink Package N/A N/A DS CM2X1024-6400C4 V

256MB A-DATA E2508AB-GE-E N/A N/A SS M20EL6F3G3170A1D0Z

256MB A-DATA E2508AB-GE-E N/A N/A SS M20EL6F3G3160A1D0Z

256MB A-DATA E2508AB-GE-E N/A N/A SS M2OEL6F3G3160A1D0Z V V

512MB A-DATA E2508AB-GE-E N/A N/A DS M2OEL6F3H4170A1D0Z

512MB A-DATA N/A N/A N/A SS M2OAD6G3H3160J1E52

512MB A-DATA AD29608A8A-25EG N/A N/A SS M20AD6G3H3160I1E5E

256MB Apacer E2508AB-GE-E N/A N/A SS 78.81091.420 V

512MB Apacer E2508AB-GE-E N/A N/A DS 78.91091.420

512MB Crucial Heat-Sink Package N/A N/A SS BL6464AA804.8FA

(Continued on the next page)

ASUS Crosshair

2-13

DDR2-800 MHz capability

Qualied Vendors List (QVL) Standard table for user manual

DIMM Support

Chip

SS/

Size Vendor Chip No. CL

Brand

DS Part No.

A* B* C*

1024MB Crucial Heat-Sink Package N/A N/A DS BL12864AA804.16FA V V

256MB TwinMOS E2508AB-GE-E N/A N/A SS 8G-24IK2-EBT

512MB OCZ Heat-Sink Package N/A N/A SS OCZ28001024EBDCPE-K

512MB Elixir N2TU51280AE-25C N/A N/A SS M2Y51264TU88A2B-25C

512MB NANYA NT5TU64M8AE-25C N/A N/A SS NT512T64U88A1BY-25C

512MB NANYA NT5TU64M8BE-25C N/A N/A SS NT512T64U88B0BY-25C

1024MB NANYA NT5TU64M8BE-25C N/A N/A DS NT1GT64U8HB0BY-25C

1024MB GEIL Heat-Sink Package N/A N/A DS GX22GB6400UDC

SS - Single-sided DS - Double-sided

DIMM support:

A - Supports one module inserted into either slot, in Single-channel memory conguration.

B - Supports one pair of modules inserted into either Channel A or Channel B as one pair of

Dual-channel memory conguration.

C - Supports four modules inserted into the yellow and black slots as two pairs of

Dual-channel memory conguration.

Visit the ASUS website for the latest DDR2-800 MHz QVL.

2-14

Chapter 2: Hardware information

DDR2-667 MHz capability

Qualied Vendors List (QVL) Standard table for user manual

DIMM support

SS/

Size Vendor Chip No. CL Brand

DS Part No.

A* B* C*

512MB KINGSTON E5108AE-6E-E N/A N/A SS KVR667D2N5/512 V V V

1024MB KINGSTON E5108AE-6E-E N/A N/A DS KVR667D2N5/1G V

512MB KINGSTON E5108AE-6E-E N/A N/A SS KVR667D2E5/512 V V V

256MB KINGSTON HYB18T256800AF3 N/A N/A SS KVR667D2N5/256 V V V

256MB SAMSUNG K4T56083QF-ZCE6 N/A N/A SS M378T3253FZ0-CE6 V V V

512MB SAMSUNG K4T56083QF-ZCE6 N/A N/A DS M378T6453FZ0-CE6 V V V

256MB SAMSUNG K4T56083QF-ZCE6(ECC) N/A N/A SS M391T3253FZ0-CE6 V V

512MB SAMSUNG K4T56083QF-ZCE6(ECC) N/A N/A DS M391T6453FZ0-CE6 V V

256MB SAMSUNG K4T51163QC-ZCE6 N/A N/A SS M378T3354CZ0-CE6 V V

512MB SAMSUNG ZCE6K4T51083QC N/A N/A SS M378T6553CZ0-CE6 V V V

1024MB SAMSUNG ZCE6K4T51083QC N/A N/A DS M378T2953CZ0-CE6 V V V

512MB MICRON 4VB41D9CZM N/A N/A DS MT16HTF6464AY-667B4 V V V

256MB Inneon HYB18T512160AF-3S N/A N/A SS HYS64T32000HU-3S-A V V V

512MB Inneon HYB18T512800AF3S N/A N/A SS HYS64T64000HU-3S-A V V V

1024MB Inneon HYB18T512800AF3S N/A N/A DS HYS64T128020HU-3S-A V V

256MB Inneon HYB18T256800AF3S(ECC) N/A N/A SS HYS72T32000HU-3S-A V V

512MB Inneon HYB18T512800AF3S(ECC) N/A N/A SS HYS72T64000HU-3S-A V V V

1024MB Inneon HYB18T512800AF3S(ECC) N/A N/A DS HYS72T128020HU-3S-A V V V

512MB Inneon HYB18T512800BF3S(ECC) N/A N/A SS HYS72T64000HU-3S-B V V V

1024MB Inneon HYB18T512800BF3S(ECC) N/A N/A DS HYS72T128020HU-3S-B V V V

256MB Inneon HYB18T512160BF-3S N/A N/A SS HYS64T32000HU-3S-B V V V

512MB Inneon HYB18T512800BF3S N/A N/A SS HYS64T64000HU-3S-B V V V

1024MB Inneon HYB18T512800BF3S N/A N/A DS HYS64T128020HU-3S-B V V V

512MB Hynix HY5PS12821AFP-Y5 N/A N/A SS HYMP564U64AP8-Y5 V V V

1024MB Hynix HY5PS12821AFP-Y5 N/A N/A DS HYMP512U64AP8-Y5 V V V

1024MB Hynix HY5PS1G831FP-Y5(ECC) N/A N/A SS HYMP112U72P8-Y5 V

512MB Hynix HY5PS12821AFP-Y5(ECC) N/A N/A SS HYMP564U72AP8-Y5 V

1024MB Hynix HY5PS12821AFP-Y5(ECC) N/A N/A DS HYMP512U72AP8-Y5 V V V

512MB Hynix HY5PS12821AFP-Y4 N/A N/A SS HYMP564U64AP8-Y4 V V V

1024MB Hynix HY5PS12821AFP-Y4 N/A N/A DS HYMP512U64AP8-Y4 V V V

512MB Hynix HY5PS12821AFP-Y4(ECC) N/A N/A SS HYMP564U72AP8-Y4 V V V

1024MB Hynix HY5PS12821AFP-Y4(ECC) N/A N/A DS HYMP512U72AP8-Y4 V V V

256MB ELPIDA E2508AB-6E-E N/A N/A SS EBE25UC8ABFA-6E-E V

512MB ELPIDA E5108AE-6E-E N/A N/A SS EBE51UD8AEFA-6E-E V V V

1024MB ELPIDA Engineering Sample N/A N/A DS EBE11UD8AEFA-6E-E V

512MB crucial Heat-Sink Package N/A N/A DS BL6464AA664.16FB V V V

(Continued on the next page)

ASUS Crosshair

2-15

2.5.4 PCI slots

The PCI slots support cards such as a LAN card, SCSI card, USB card, and other

cards that comply with PCI specications. Refer to the gure below for the location

of the slots.

2.5.5 PCI Express x4 slot

This motherboard supports PCI Express x4 network cards, SCSI cards and other

cards that comply with the PCI Express specications. Refer to the gure below for

the location of the slot.

2.5.6 PCI Express x16 slots

This motherboard supports PCI Express x16 graphics cards that comply with the

PCI Express specications. Refer to the gure below for the location of the slots.

PCI slot

PCI slot

PCI Express x 16 slot

PCI Express x 16 slot

PCI Express x4 slot

PCI slot

2-22

Chapter 2: Hardware information

2.6 Jumper

Clear RTC RAM (CLRTC)

This jumper allows you to enable the CLRTC switch. You can clear the

CMOS memory of date, time, and system setup parameters by erasing the

CMOS RTC RAM data. The onboard clr CMOS switch helps you easily to

clear the system setup information such as system passwords. See page

2-35 for details.

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 to enable the

CLRTC function.

3. Press down the clr CMOS button and again to release it.

4. Plug the power cord and turn ON the computer.

5. Hold down the <Del> key during the boot process and enter BIOS setup

to re-enter data.

The clr CMOS button will not function until the jumper cap on CLRTC is moved

to the ENABLE position. Removing the cap will cause system boot failure!

• Make sure to re-enter your previous BIOS settings after you clear the

CMOS.

• 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.

• To prevent accidental pressing of the Clear CMOS switch, the CLRTC

jumper default setting disables the switch.

ASUS Crosshair

2-23

2.7 Audio Card and EL I/O Installation

2.7.1 Audio Card Installation

1. Take out the Audio card from

2. Locate the slot on the

the package.

motherboard.

3. Align the card connector

4. The above photo shows the

with the slot and press rmly

audio card installed on the

until the card sits on the slot

motherboard.

completely.

2.7.2 EL I/O Installation

1. Take out the EL I/O from the

2. Locate the connector on the

package.

motherboard.

3. Connector the cable to

4. The above photo shows

the connector in a correct

the EL I/O installed on the

orientation.

motherboard.

2-24

Chapter 2: Hardware information

2.8 Connectors

2.8.1 Rear panel connectors

1. PS/2 mouse port (green). This port is for a PS/2 mouse.

2. Coaxial S/PDIF Out port. This port connects an external audio output device

via an optical S/PDIF cable.

3. LCD Poster. This poster displays actual boot error messages.

ASUS Crosshair

2-25

4. LAN 1 (RJ-45) port. Supported by NV Gigabit LAN

controller, this port allows Gigabit connection to a Local

Area Network (LAN) through a network hub. Refer to the

table on the next page for the LAN port LED indications.

5. LAN 2 (RJ-45) port. Supported by the NV Gigabit LAN

controller, this port allows Gigabit connection to a Local

Area Network (LAN) through a network hub. Refer to the

table below for the LAN port LED indications.

32-bit OS LAN port LED indications

Activity/Link Speed LED Description

OFF OFF Soft-off Mode

YELLOW* OFF During Power ON/OFF

YELLOW* ORANGE 100 Mbps connection

* Blinking

64-bit OS LAN port LED indications

Activity/Link Speed LED Description

DNR DNR Soft-off Mode

DNR DNR During Power ON/OFF

DNR DNR 100 Mbps connection

DNR DNR 1 Gbps connection

6. Line In port (light blue). This port connects the tape, CD, DVD player, or

other audio sources.

7. Line Out port (lime). This port connects a headphone or a speaker. In

4-channel, 6-channel, and 8-channel conguration, the function of this port

becomes Front Speaker Out.

8. Microphone port (pink). This port connects a microphone.

9. Center/Subwoofer port (orange). This port connects the center/subwoofer

speakers.

10. Rear Speaker Out port (black). This port connects the rear speakers on a

4-channel, 6-channel, or 8-channel audio conguration.

11. Side Speaker Out port (gray). This port connects the side speakers in an

8-channel audio conguration.

Refer to the audio conguration table below for the function of the audio ports in

2, 4, 6, or 8-channel conguration.

Audio 2, 4, 6, or 8-channel conguration

Headset

Port

4-channel 6-channel 8-channel

2-channel

Light Blue Line In Line In Line In Line In

Lime Line Out Front Speaker Out Front Speaker Out Front Speaker Out

Pink Mic In Mic In Mic In Mic In

Orange – – Center/Subwoofer Center/Subwoofer

Black – Rear Speaker Out Rear Speaker Ou Rear Speaker Out

Gray – – Side Speaker Out

–

12. USB 2.0 ports 1 and 2, 3 and 4. These 4-pin Universal Serial Bus (USB)

ports are available for connecting USB 2.0 devices.

13. External SATA ports. These ports connect to an external SATA box or a

Serial ATA port multiplier. These ports support a Serial ATA hard disk drives

that you can combine with an external Serial ATA 3.0 Gb/s device to congure

a RAID 0, RAID 1, RAID 0+1 (10), RAID 5, or JBOD set through the onboard

Silicon Image® SATA RAID controller. Refer to Chapter 5 for details on how

to set up Serial ATA RAID congurations.

2-26

Chapter 2: Hardware information

• Before creating a RAID set using Serial ATA hard disks, make sure that you

have connected the Serial ATA signal cable and installed Serial ATA hard

disk drives; otherwise, you cannot enter the Silicon Image RAID utility and

SATA BIOS setup during POST.

• The external SATA ports support external Serial ATA 1.5 and 3 Gb/s

devices. Longer cables support higher power requirements to deliver signal

up to two meters away, and enables improved hot-swap function.

• If you intend to create a RAID conguration using this connector, set the

Silicon 3132 Controller item in the BIOS to [RAID Mode]. See section “4.4.6

Onboard Devices Conguration” for details.

• Use these ports and an external Serial ATA box connected to the external

SATA port, if you want to congure a RAID 0 or RAID 1 set.

• The Serial ATA port multiplier and external Serial ATA box are purchased

separately.

• DO NOT insert a different connector to this port.

• DO NOT unplug the external Serial ATA box when a RAID 0 or RAID 1 is

congured.

14. IEEE 1394a port. This 6-pin IEEE 1394a port provides high-speed

connectivity for audio/video devices, storage peripherals, PCs, or portable

devices.

15. Onboard LED switch. This motherboard features onboard LEDs that light

up the labels, making it easy for you to install or plug in devices even in the

dark. Press this switch to turn on the onboard LEDs.

16. Optical S/PDIF Out port. This port connects an external audio output device

via an optical S/PDIF cable.

17. PS/2 keyboard port (purple). This port is for a PS/2 keyboard.

ASUS Crosshair

2-27

2.8.2 Internal connectors

1. Floppy disk drive connector (34-1 pin FLOPPY)

This connector is for the provided oppy disk drive (FDD) signal cable. Insert

one end of the cable to this connector, then connect the other end to the

signal connector at the back of the oppy disk drive.

Pin 5 on the connector is removed to prevent incorrect cable connection when

using a FDD cable with a covered Pin 5.

2. IDE connector (40-1 pin PRI_IDE)

The onboard IDE connector is for the Ultra DMA (133/)100/66 signal cable.

There are three connectors on each Ultra DMA 133/100/66 signal cable:

blue, black, and gray. Connect the blue connector to the motherboard’s IDE

connector, then select one of the following modes to congure your device.

2-28

Chapter 2: Hardware information

Mode of

Drive jumper setting

Cable connector

device(s)

Single device Cable-Select or Master - Black

Black

Master

Cable-Select

Slave Gray

Two devices

Master Master

Black or gray

Slave Slave

• Pin 20 on the IDE connector is removed to match the covered hole on the

Ultra DMA cable connector. This prevents incorrect insertion when you

connect the IDE cable.

• Use the 80-conductor IDE cable for Ultra DMA 133/100/66 IDE devices.

If any device jumper is set as “Cable-Select,” make sure all other device

jumpers have the same setting.

ASUS Crosshair

2-29

®

3. NVIDIA

NF590-SLI Southbridge Serial ATA connectors (7-pin SATA1

[blue], SATA2 [blue], SATA3 [blue], SATA4 [blue], SATA5 [blue], SATA6

[blue])

These connectors are for the Serial ATA signal cables for Serial ATA 3.0

Gb/s hard disk and optical disk drives. The Serial ATA 3.0 Gb/s is backward

compatible with Serial ATA 1.5 Gb/s specication.

If you installed Serial ATA hard disk drives, you can create a RAID 0, RAID 1,

RAID 0+1 (10), RAID 5, or JBOD conguration through the onboard NVRAID

®

controller. Refer to section “5.4.1 NVIDIA

RAID congurations” for details on

how to set up Serial ATA RAID congurations.

The RAID function of these connectors is set to [Disabled] by default. If you

intend to create a Serial ATA RAID set using these connectors, enable the RAID

Enabled item in the BIOS. See section “4.5.4 Onboard Device Conguration >

Serial-ATA Conguration” for details.

4. USB connectors (10-1 pin USB56, USB78, USB910)

These connectors are for USB 2.0 ports. Connect the USB/GAME module

cable to any of these connectors, then install the module to a slot opening at

the back of the system chassis. These USB connectors comply with USB 2.0

specication that supports up to 480 Mbps connection speed.

Never connect a 1394 cable to the USB connectors. Doing so will damage the

motherboard!

2-30

Chapter 2: Hardware information

5. IEEE 1394a port connector (10-1 pin IE1394_2)

This connector is for a IEEE 1394a port. Connect the IEEE 1394a module

cable to this connector, then install the module to a slot opening at the back

of the system chassis.

Never connect a USB cable to the IEEE 1394a connector. Doing so will damage

the motherboard!

6. CPU, chassis, and optional fan connectors

(4-pin CPU_FAN, 3-pin CHA_REAR_FAN, 3-pin CHA_FRONT_FAN, 3-pin

OPT_FAN1, 3-pin OPT_FAN2, 3-pin OPT_FAN3, 3-pin OPT_FAN4, 3-pin

OPT_FAN5)

The fan connectors support cooling fans of 350 mA ~ 1000 mA (24 W max.) or

a total of 1 A ~ 3.48 A (41.76 W max.) at +12V. Connect the fan cables to the

fan connectors on the motherboard, making sure that the black wire of each

cable matches the ground pin of the connector.

Do not forget to connect the fan cables to the fan connectors. Insufcient air

ow inside the system may damage the motherboard components. These are

not jumpers! Do not place jumper caps on the fan connectors!

ASUS Crosshair 2-31

CPU_FAN

OPT_FAN5

OPT_FAN4

GND

+12V

Rotation

RPM adjustment

Rotation

+12V

GND

CPU_FAN

OPT_FAN1

OPT_FAN5

Rotation

Rotation

OPT_FAN4

+12V

+12V

GND

GND

OPT_FAN3

CHA__REAR_FAN

OPT_FAN2

CHA_FRONT_FAN

OPT_FAN1

Rotation

Rotation

+12V

+12V

OPT_FAN2

CROSSHAIR

GND

GND

CHA__FRONT_FAN

OPT_FAN3

CHA_REAR_FAN

Rotation

Rotation

+12V

+12V

GND

GND

CROSSHAIR Fan connectors

7. Chassis intrusion connector (4-1 pin CHASSIS)

This connector is for a chassis-mounted intrusion detection sensor or switch.

Connect one end of the chassis intrusion sensor or switch cable to this

connector. The chassis intrusion sensor or switch sends a high-level signal to

this connector when a chassis component is removed or replaced. The signal

is then generated as a chassis intrusion event.

By default, the pins labeled “Chassis Signal” and “Ground” are shorted with

a jumper cap. Remove the jumper caps only when you intend to use the

chassis intrusion detection feature.