EVGA 750i Getting Started

Getting Started

Chapter 1

Getting Started

Thank you for choosing the 750i (V1.X) ATX mainboard.
The mainboard is based on NVIDIA® nForce 750i SLI
(C72P) & 430i (MCP51) chipsets for optimal system
efficiency. Designed to fit the advanced Intel® CoreTM2
Extreme, CoreTM2 Quad, CoreTM2 Duo, Pentium® Dual­Core and Celeron® processors, the mainboard delivers
a high performance and professional desktop platform
solution.

1-1

750i Mainboard

Mainboard Specifications

Processor

- Intel® CoreTM2 Extreme, CoreTM2 Quad, CoreTM2 Duo, Pentium
Dual-Core and Celeron® processors in the LGA775 package

- Supports Intel® SpeedStep Technology (EIST)

- Supports Intel® Hyper-Threading Technology (HT)

FSB

- 400/ 533/ 800/ 1066/ 1333/ 1800 (OC) MHz

Chipset

- North Bridge: NVIDIA® nForce 750i SLI chipset (C72P)

- South Bridge: NVIDIA® nForce 430i chipset (MCP51)

Memory

- DDR2 533/ 667/ 800/ 1200 (OC) SDRAM

- 4 DDR2 DIMM slots (8 GB Max) (240-Pin/ 1.8 V)

LAN

- Supports 10/ 100/ 1000 Fast Ethernet by Realtek® RTL8211BL

- Compliant with PCI 2.2

- Supports ACPI Power Management

IEEE 1394

- Chip integrated by VIA® VT6308P

- Transfer rate is up to 400 Mb/s

®

1-2

Audio

- Chip integrated by Realtek® ALC888S

- Flexible 8-channel audio with jack sensing

- Compliant with Azalia 1.0 spec

- Meet Microsoft® Windows® VistaTM Premium spec

IDE

- 2 IDE ports by NVIDIA® nForce 430i

- Supports four IDE devices

- Supports Ultra DMA 33/ 66/ 100/ 133 mode

- Supports PIO, Bus Master operation mode

SATA

- 4 SATA ports by NVIDIA® nForce 430i

- Supports four SATA devices

- Supports storage and data transfers up to 3 Gb/s

- 1 eSATA port by JMicron® JMB363

Getting Started

RAID

- 4 SATAII ports support RAID 0/ 1/ 0+1/ 5 or JBOD mode by NVIDIA
nForce 430i

- 1 eSATA port support RAID 0/ 1 mode by JMicron® JMB363

Floppy

- 1 floppy port supports 1 FDD with 360KB, 720KB, 1.2MB, 1.44MB
and 2.88MB

Back Panel

- 1 PS/2 mouse/ keyboard port

- 1 optical S/PDIF-out port

- 1 coaxial S/PDIF-out port

- 1 debug LED

- 1 clear CMOS button

- 1 IEEE 1394 port

- 6 USB ports

- 1 eSATA port

- 1 LAN jack

- 6 audio jacks

Connector

- 1 CD-in connector

- 1 front panel audio connector

- 1 serial port connector

- 1 IEEE 1394 connector

- 1 USB connector

- 1 S/PDIF-out connector

®

Slots

- 2 PCI express x16 slots

- 1 PCI express x1 slot

- 2 PCI slots support 3.3 V/ 5 V PCI bus interface

Form Factor

- ATX (30.5 cm X 24.5 cm)

Mounting

- 9 mounting holes

1-3

750i Mainboard

PCI1

PCI_E1

PCI_E2

PCI_E3

IDE1

IDE2

FDD1

BATT

SYSFAN3

Mainboard Layout

T: MOUSE/
B: USB PORTS

CLEAR CMOS BUTTON

T: OPTICAL S/PDIF-OUT
B: COAXIAL S/PDIF-OUT

DEBUG LED

T: 1394 PORT
B: USB PORTS/ ESATA PORT

T: LAN JACK
B: USB PORTS

T: LINE-IN
M: LINE-OUT
B: MIC
T: RS-OUT
M: CS-OUT
B: SS-OUT

JCD1

REALTEK
ALC888S

JAUD1

FINTEK

F71882FG

KEYBOARD

REALTEK

RTL8211BL

JMICRON

JMB363

JSPDIF

JPWR2

SYSFAN1

NVIDIA

NF200

NVIDIA

C55

CPUFAN1

NVIDIA
MCP51

VIA

VT6308P

1
R

W
P

J

2
N
A

F

1

2

3
M
M

I
D

4

M

M

M

M

M

M

I

I

I

D

D

D

+

S
Y
S

4
_
3
A
T
A
S

2
_
1
A
T
A
S

1
C
O

J

2
P
F

J

1
P
F

J

PCI2

JCOM1

1-4

J1394_1

JUSB1

750i (V1.X) ATX Mainboard

Getting Started

Packing Checklist

Mainboard Driver/ Utility CD Back I/O Shield

Standard Cable for

Power Cable SATA Cable

2-Way SLI bridge cable

* The pictures are for reference only. Your packing contents may vary depending on

the model you purchased.

IDE Devices

1-5

Hardware Setup

Chapter 2

Hardware Setup

This chapter provides you with the information about
hardware setup procedures. While doing the installation,
be careful in holding the components and follow the
installation procedures. For some components, if you
install in the wrong orientation, the components will not
work properly.

Use a grounded wrist strap before handling computer
components. Static electricity may damage the
components.

2-1

750i Mainboard

Quick Components Guide

Back Panel,

p. 2-11

SYSFAN1,

p. 2-16

JCD1,

p. 2-17

JSPDIF,

p. 2-18

JAUD1,

p. 2-18

Slots,

p. 2-28

JPWR2,

p. 2-10

CPU,

p. 2-3

CPUFAN1,

p. 2-16

Memory,

p. 2-7

JPWR1,

p. 2-9

SYSFAN3,

p. 2-16

SATA1/ 2/ 3/ 4,

p. 2-15

JOC1,

p. 2-20

JFP1/ 2,

p. 2-17

2-2

JCOM1,

p. 2-19

SYSFAN2,

p. 2-16

FDD1,

p. 2-15

J1394_1,

p. 2-16

JUSB1,

p. 2-19

IDE1/ 2,

p. 2-14

Hardware Setup

CPU (Central Processing Unit)

This mainboard supports Intel® processors in the LGA775 package. When you are
installing the CPU, make sure to install the cooler to prevent overheating. If you do not
have the CPU cooler, consult your dealer before turning on the computer.

Important

1. Overheating will seriously damage the CPU and system. Always make sure
the cooling fan can work properly to protect the CPU from overheating.
Make sure that you apply an even layer of thermal paste (or thermal tape)
between the CPU and the heatsink to enhance heat dissipation.

2. While replacing the CPU, always turn off the ATX power supply or unplug
the power supply’s power cord from the grounded outlet first to ensure the
safety of CPU.

3. This mainboard is designed to support overclocking. However, please
make sure your components are able to tolerate such abnormal setting,
while doing overclocking. Any attempt to operate beyond product specifi­cations is not recommended. We do not guarantee the damages or risks
caused by inadequate operation or beyond product specifications.

Introduction to LGA 775 CPU

The pin-pad side of LGA775 CPU.

Alignment Key

Yellow triangle is the Pin 1 indicator

The surface of LGA775 CPU. Re­member to apply some thermal paste
on it for better heat dispersion.

Alignment Key

Yellow triangle is the Pin 1 indicator

2-3

750i Mainboard

CPU & Cooler Installation

When you are installing the CPU, make sure the CPU has a cooler attached on the top
to prevent overheating. Meanwhile, do not forget to apply some thermal paste on CPU
before installing the heat sink/ cooler fan for better heat dispersion. Follow the steps
below to install the CPU & cooler correctly. Wrong installation will cause the damage
of your CPU & mainboard.

1.The CPU socket has a plastic cap
on it to protect the contact from
damage. Before you install the
CPU, always cover it to protect
the socket pin.

2.Remove the cap from lever hinge
side (as the arrow shows).

4.Open the load lever.3.The pins of socket reveal.

2-4

Hardware Setup

Important

1.Confirm if your CPU cooler is firmly installed before turning on your system.

2. Do not touch the CPU socket pins to avoid damaging.

3. The availability of the CPU land side cover depends on your CPU packing.

5.Lift the load lever up and open
the load plate.

7.Visually inspect if the CPU is
seated well into the socket. If not,
take out the CPU with pure verti­cal motion and reinstall.

6.After confirming the CPU direc­tion for correct mating, put down
the CPU in the socket housing
frame. Be sure to grasp on the
edge of the CPU base. Note that
the alignment keys are matched.

Alignment Key

8.Cover the load plate onto the
package.

2-5

750i Mainboard

9.Press down the load lever lightly
onto the load plate, and then se­cure the lever with the hook un­der retention tab.

11.Press the four hooks down to

fasten the cooler. Then rotate the
locking switch (refer to the cor­rect direction marked on it) to lock
the hooks.

10. Align the holes on the mainboard
with the heatsink. Push down
the cooler until its four clips get
wedged into the holes of the
mainboard.

12.Turn over the mainboard to con­firm that the clip-ends are cor­rectly inserted.

Mainboard

Locking Switch

Hook

Important

1. Whenever CPU is not installed, always protect your CPU socket pin with the
plastic cap covered (shown in Figure 1) to avoid damaging.

2. Mainboard photos shown in this section are for demonstration of the CPU/
cooler installation only. The appearance of your mainboard may vary de­pending on the model you purchase.

2-6

Hardware Setup

Empty

Installed

Memory

These DIMM slots are used for installing memory modules.

DDR2

64x2=128-Pin 56x2=112-Pin

Single-Channel: All DIMMs in GREEN.
Dual-Channel: Channel A in GREEN; Channel B in Black.

Dual-Channel mode Population Rule

In Dual-Channel mode, the memory modules can transmit and receive data with two
data bus lines simultaneously. Enabling Dual-Channel mode can enhance the system
performance. The following illustrations explain the population rules for Dual-Channel
mode.

240-Pin/ 1.8 V

DIMM1
DIMM2
DIMM3
DIMM4

DIMM1
DIMM2
DIMM3
DIMM4

DIMM1
DIMM2
DIMM3
DIMM4

DIMM1
DIMM2
DIMM3
DIMM4

2-7

750i Mainboard

Installing Memory Modules

1. The memory module has only one notch on the center and will only fit in the right
orientation.

2. Insert the memory module vertically into the DIMM slot. Then push it in until the
golden finger on the memory module is deeply inserted in the DIMM slot. The plastic
clip at each side of the DIMM slot will automatically close when the memory module
is properly seated.

Important

You can barely see the golden finger if the memory module is properly in­serted in the DIMM slot.

3. Manually check if the memory module has been locked in place by the DIMM slot
clips at the sides.

Volt Notch

Important

1. DDR2 memory modules are not interchangeable with DDR and the DDR2
standard is not backwards compatible. You should always install DDR2
memory modules in the DDR2 DIMM slots.

2. In Dual-Channel mode, make sure that you install memory modules of the
same type and density in different channel DIMM slots.

3. To enable successful system boot-up, always insert the memory modules
into the DIMM1 first.

4. Due to the chipset resource deployment, the system density will only be
detected up to 7+ GB (not full 8 GB) when each DIMM is installed with a 2
GB memory module.

2-8

Power Supply

ATX 24-Pin Power Connector: JPWR1

Hardware Setup

This connector allows you to connect an ATX 24-pin power supply.
To connect the ATX 24-pin power supply, make sure the plug of the
power supply is inserted in the proper orientation and the pins are
aligned. Then push down the power supply firmly into the connector.
You may use the 20-pin ATX power supply as you like. If you’d like
to use the 20-pin ATX power supply, please plug your power sup­ply along with pin 1 & pin 13 (refer to the image at the right hand).

12

1

JPWR1

24

PIN SIGNAL

1 +3.3V
2 +3.3V
3 GND
4 +5V
5 GND
6 +5V
7 GND
8 PWR OK
9 5VSB

13

10 +12V
11 +12V
12 +3.3V

Pin Definition

PIN SIGNAL

13 +3.3V
14 -12V
15 GND
16 PS-ON#
17 GND
18 GND
19 GND
20 Res
21 +5V
22 +5V
23 +5V
24 GND

pin 13

pin 12

2-9

750i Mainboard

SSI 8-Pin CPU Power Connector: JPWR2

This connector provides 12V power output to the CPUs.

Pin Definition

8
4

JPWR2

5
1

PIN SIGNAL

1 GND
2 GND
3 GND
4 GND

PIN SIGNAL

5 +12V
6 +12V
7 +12V
8 +12V

Important

1. Make sure that all the connectors are connected to proper ATX power
supplies to ensure stable operation of the mainboard.

2. Power supply of 450 watts (and above) is highly recommended for system
stability.

3. nForce chipset is very sensitive to ESD (Electrostatic Discharge), there­fore this issue mostly happens while the users intensively swap memory
modules under S5 (power-off) states, and the power code is plugged while
installing modules. Due to several pins are very sensitive to ESD, so this
kind of memory-replacement actions might cause system chipset unable
to boot. Please follow the following solution to avoid this situation: Unplug
the AC power cable or unplug the power connectors before the 1st instal­lation or during system upgrade procedure.

2-10

Back Panel

Hardware Setup

Mouse/

Keyboard

Clear

CMOS

Mouse/ Keyboard

The standard PS/2® mouse/ keyboard DIN connector is for a PS/2® mouse/ keyboard.

USB Port

The USB (Universal Serial Bus) port is for attaching USB devices such as keyboard,
mouse, or other USB-compatible devices.

Optical S/PDIF-Out

This SPDIF (Sony & Philips Digital Interconnect Format) connector is provided for
digital audio transmission to external speakers through an optical fiber cable.

Coaxial

S/PDIF-out

Debug

LED

Optical

S/PDIF-out

IEEE 1394

eSATAUSB USB

LAN

Line-In

Line-Out

Mic

RS-Out

CS-Out

SS-Out

Coaxial S/PDIF-Out

This SPDIF (Sony & Philips Digital Interconnect Format) connector is provided for
digital audio transmission to external speakers through a coaxial cable.

Clear CMOS

There is a CMOS RAM on board that has a power supply from external battery to
keep the system configuration data. With the CMOS RAM, the system can automati­cally boot OS every time it is turned on. If you want to clear the system configuration,
use the button to clear data. Press the button to clear the data.

Important

Make sure that you power off the system before clearing CMOS data.

2-11

750i Mainboard

IEEE 1394 Port

The IEEE 1394 port on the back panel provides connection to IEEE 1394 devices.

eSATAA

This eSATA (External Serial ATA) port is used to connect the external SATA device.
You can also use the optional external SATA cable to connect SATA device and
eSATA port.

LAN

The standard RJ-45 LAN jack is for connection to the Local Area Network (LAN). You
can connect a network cable to it.

Link IndicatorActivity Indicator

LED

Left

Right

Color LED State Condition

Off LAN link is not established.

Yellow

Green

Orange

On (steady state) LAN link is established.
On (brighter & pulsing) The computer is communicating with another computer on the LAN.
Off 10 Mbit/ sec data rate is selected.

On 100 Mbit/ sec data rate is selected.
On 1000 Mbit/ sec data rate is selected.

Audio Ports

These audio connectors are used for audio devices. It is easy to differentiate be­tween audio effects according to the color of audio jacks.

Line-In (Blue) - Line In/ Side-Surround Out in 7.1 channel mode, is used

for external CD player, tapeplayer or other audio devices.

Line-Out (Green) - Line Out, is a connector for speakers or headphones.
Mic (Pink) - Mic, is a connector for microphones.
RS-Out (Black) - Rear-Surround Out in 4/ 5.1/ 7.1 channel mode.
CS-Out (Orange) - Center/ Subwoofer Out in 5.1/ 7.1 channel mode.
SS-Out (Gray) - Side-Surround Out 7.1 channel mode.

2-12

Hardware Setup

Debug LED

Please refer to the table below to get more information about the Debug LED message.

Post Status
FF Power on and first initialize CPU.
D0, D4, D5 Initialize memory port device.
08 Initialize keyboard.
C0, C1, C2 Early CPU Initialize Start - Disable Cache, Set up boot strap

processor information.

C4, C6 Initialize HT (FSB).
2A, 31 Initialize onboard devices. Load Option ROM (VGA and RAID

option ROM) form BIOS to memory.

37 Displaying sign-on message, CPU information, setup key

message and any OEM specific information.

38 Initialize USB device and different devices.
3C Mid POST initialization of chipset registers. Detect different

devices (parallel ports, serial ports and coprocessor in CPU…etc.)

75, 78 Initialize INT 13 devices and IPL devices. (include SATA/ PATA

HDD and CD ROM).

87 Enter setup screen. BIOS setup if needed/ requested.
A7 Display the system configuration screen if enabled.
A9 Wait for user input at configuration display if needed.
B1 Save system context for ACPI (Advanced Configuration and Power

Interface). Prepare give control to OS loader (INT 19H).

00 Pass control to OS Loader (typically INT 19H).
AA Enter OS (Vista or Windows XP).

2-13

750i Mainboard

Connectors

IDE Connector: IDE1/ 2

This connector supports IDE hard disk drives, optical disk drives and other IDE devices.

IDE2

IDE1

IDE1 (Primary IDE Connector)

The first hard drive should always be connected to IDE1. IDE1 can connect a master
and a slave drive.

IDE2 (Secondary IDE Connector)

IDE2 can also connect a master and a slave drive.

Important

If you install two IDE devices on the same cable, you must configure the
drives separately to master/ slave mode by setting jumpers. Refer to IDE
device’s documentation supplied by the vendors for jumper setting instructions.

2-14

Hardware Setup

Floppy Disk Drive Connector: FDD1

This connector supports 360KB, 720KB, 1.2MB, 1.44MB or 2.88MB floppy disk drive.

FDD1

Serial ATA Connector: SATA1/ 2/ 3/ 4

This connector is a high-speed Serial ATA interface port. Each connector can con­nect to one Serial ATA device.

SATA1_2 SATA3_4

Important

Please do not fold the Serial ATA cable into 90-degree angle. Otherwise, data
loss may occur during transmission.

2-15

750i Mainboard

Fan Power Connectors: CPUFAN1, SYSFAN1/ 2/ 3

The fan power connectors support system cooling fan with +12V. When connecting
the wire to the connectors, always note that the red wire is the positive and should
be connected to the +12V; the black wire is Ground and should be connected to GND.
ISf the mainboard has a System Hardware Monitor chipset on-board, you must use a
specially designed fan with speed sensor to take advantage of the CPU fan control.

CONTROL

SENSOR

+12V

GND

CPUFAN1

GND
+12V
SENSOR

SYSFAN1

GND

+1 2V

SENSOR

SYSFAN2

NC

+12V

GND

SYSFAN3

Important

Please refer to the recommended CPU fans at processor’s official website or
consult the vendors for proper CPU cooling fan.

IEEE 1394 Connector: J1394_1

This connector allows you to connect the IEEE 1394 device via an optional IEEE 1394
bracket.

Pin Definition

9
10

J1394_1

2-16

PIN SIGNAL PIN SIGNAL

1
2

1 TPA+ 2 TPA­3 Ground 4 Ground
5 TPB+ 6 TPB­7 Cable power 8 Cable power
9 Key (no pin) 10 Ground

IEEE 1394 Bracket

(Optional)

Hardware Setup

CD-In Connector: JCD1

This connector is provided for external audio input.

GNDR L

JCD1

Front Panel Connectors: JFP1/ 2

These connectors are for electrical connection to the front panel switches and LEDs.
The JFP1 is compliant with Intel® Front Panel I/O Connectivity Design Guide.

Pin Definition

Power
Switch++

Power
LED

10 9

-

2 1

JFP1

Speaker

+

Reset

-

Switch

-

HDD
LED

+

­+

-

8 7

2 1

JFP2

PIN SIGNAL DESCRIPTION

1 HD_LED + Hard disk LED pull-up
2 FP PWR/SLP MSG LED pull-up
3 HD_LED - Hard disk active LED
4 FP PWR/SLP MSG LED pull-up
5 RST_SW - Reset Switch low reference pull-down to GND
6 PWR_SW + Power Switch high reference pull-up
7 RST_SW + Reset Switch high reference pull-up
8 PWR_SW - Power Switch low reference pull-down to GND
9 RSVD_DNU Reserved. Do not use.

Pin Definition

PIN SIGNAL DESCRIPTION

1 GND Ground

Power
LED

2 SPK- Speaker­3 SLED Suspend LED
4 BUZ+ Buzzer+
5 PLED Power LED
6 BUZ- Buzzer­7 NC No connection
8 SPK+ Speaker+

2-17

750i Mainboard

Front Panel Audio Connector: JAUD1

This connector allows you to connect the front panel audio and is compliant with
Intel® Front Panel I/O Connectivity Design Guide.

2
1

10
9

JAUD1

HD Audio Pin Definition

PIN SIGNAL DESCRIPTION

1 MIC_L Microphone - Left channel
2 GND Ground
3 MIC_R Microphone - Right channel
4 NC No Connection
5 LINE out_R Line Out Right Channel
6 MIC_JD Microphone Jack detection
7 Front_JD Front Panel Jack Detection Sense Line
8 Key No pin
9 LINE out_L Line Out Left Channel
10 LINEout_JD Line Out Jack Detection

AC ’97 Audio Pin Definition

PIN SIGNAL DESCRIPTION

1 MIC Microphone input signal
2 GND Ground
3 MIC_PWR Microphone power
4 NC No Control
5 LINE out_R Right channel audio signal to front panel
6 NC No Control
7 NC No Control
8 Key No pin
9 LINE out_L Left channel audio signal to front panel
10 NC No Control

SPDIF-Out Connector: JSPDIF

This connector is used to connect S/PDIF (Sony & Philips Digital Interconnect Format)
interface for digital audio transmission.

VCC

SPDIF

GND

JSPDIF

2-18

S/PDIF Bracket

(Optional)

Hardware Setup

Front USB Connector: JUSB1

This connector, compliant with Intel® I/O Connectivity Design Guide, is ideal for con­necting high-speed USB interface peripherals such as USB HDD, digital cameras,
MP3 players, printers, modems and the like.

Pin Definition

PIN SIGNAL PIN SIGNAL

2
1

JUSB1

10
9

1 VCC 2 VCC
3 USB0- 4 USB1­5 USB0+ 6 USB1+
7 GND 8 GND
9 Key (no pin) 10 USBOC

USB 2.0 Bracket

(Optional)

Important

Note that the pins of VCC and GND must be connected correctly to avoid
possible damage.

Serial Port Connector: JCOM1

This connector is a 16550A high speed communication port that sends/receives 16
bytes FIFOs. You can attach a serial device.

Pin Definition

PIN SIGNAL DESCRIPTION

2
1

JCOM1

9

1 DCD Data Carry Detect
2 SIN Serial In or Receive Data
3 SOUT Serial Out or Transmit Data
4 DTR Data Terminal Ready
5 GND Ground
6 DSR Data Set Ready
7 RTS Request To Send
8 CTS Clear To Send
9 RI Ring Indicate

2-19

750i Mainboard

Jumpers

Overclock Jumper: JOC1

This connector is provided for system overclock, follow the step to set up the jumper
for safe/ overclock mode.

3

1

JOC1

3

1

Safe Mode

LED light is off

(Default)

LED light is on3

1

Overclock

Mode

Important

You can overclock by shorting 1-2 pin while the system is off. Then return to
2-3 pin position. Avoid overclocking while the system is on; it will damage the
mainboard.

2-20

BIOS Setup

Hardware Setup

Important

Change these settings only if you are familiar with the chipset.

Current CPU/ FSB/ DRAM Frequency

These items show the current clocks of CPU and Memory speed. Read-only.

Intel EIST

The Enhanced Intel SpeedStep technology allows you to set the performance level of
the microprocessor whether the computer is running on battery or AC power. This
field will appear after you installed the CPU which support speedstep technology.

2-21

750i Mainboard

- Safe Mode -

XFX JOC1 Over Clock Function

Press <Enter> and the following sub-menu appears.

CPU Voltage (V)

This item shows you the CPU voltage. Read-only.

Memory Voltage (V)

This item shows you the memory voltage. Read-only.

VTT FSB Voltage (V)

This item shows you the VTT FSB voltage. Read-only.

NB Voltage (V)

This item shows you the North Bridge chipset voltage. Read-only.

SB Core Power (V)

This item shows you the South Bridge chipset voltage. Read-only.

2-22

- Overclock Mode -

XFX JOC1 Over Clock Function

Press <Enter> and the following sub-menu appears.

Hardware Setup

FSB Clock (MHz)

When the System Clock Mode sets to [Manual], the field is adjustable. This item
allows you to select the CPU Front Side Bus clock frequency (in MHz).

Memory Clock (MHz)

When the System Clock Mode sets to [Manual], the field is adjustable.This item
allows you to select the memory clock frequency (in MHz).

Adjusted DRAM Frequency (MHz)

It shows the adjusted DDR Memory frequency. Read-only.

Adjust CPU Ratio

This item is used to adjust CPU clock multiplier (ratio). It is available only when
the processor supports this function.

CPU Voltage (V)

This item allows you to increase the CPU voltage.

2-23

750i Mainboard

Memory Voltage (V)

This item allows you to adjust the memory voltage that can increase the memory
speed.

VTT FSB Voltage (V)

This item allows you to adjust the VTT FSB voltage.

NB Voltage (V)

This item allows you to adjust the North Bridge chipset voltage.

Advance DRAM Configuration

Press <Enter> and the following sub-menu appears.

Memory Timings

This field has the capacity to automatically detect all of the DRAM timing. If you
set this field to [Manual], some fields will appear and selectable.

CAS Latency (CL)

When the Memory Timings sets to [Manual], the field is adjustable.This controls
the CAS latency, which determines the timing delay (in clock cycles) before
SDRAM starts a read command after receiving it.

tRCD

When the Memory Timings sets to [Manual], the field is adjustable. When DRAM
is refreshed, both rows and columns are addressed separately. This setup
item allows you to determine the timing of the transition from RAS (row ad­dress strobe) to CAS (column address strobe). The less the clock cycles, the
faster the DRAM performance.

2-24

Hardware Setup

tRP

When the Memory Timings sets to [Manual], this field is adjustable. This setting
controls the number of cycles for Row Address Strobe (RAS) to be allowed to
precharge. If insufficient time is allowed for the RAS to accumulate its charge
before DRAM refresh, refresh may be incomplete and DRAM may fail to retain
data. This item applies only when synchronous DRAM is installed in the system.

tRAS

When the Memory Timings sets to [Manual], this field is adjustable. This setting
determines the time RAS takes to read from and write to memory cell.

tRRD

When the Memory Timings sets to [Manual], the field is adjustable. Specifies
the active-to-active delay of different banks. Time interval between a read and
a precharge command.

tRC

When the Memory Timings sets to [Manual], the field is adjustable. The rowcycle
time determines the minimum number of clock cycles a memory row takesto
complete a full cycle, from row activation up to the precharging of the activerow.

tWR

When the Memory Timings sets to [Manual], the field is adjustable. Minimum time
interval between end of write data burst and the start of a precharge command.
Allows sense amplifiers to restore data to cells.

tWTR

When the Memory Timings sets to [Manual], the field is adjustable. Minimum time
interval between the end of write data burst and the start of a column-read
command. It allows I/O gating to overdrive sense amplifiers before read com­mand starts.

tREF

When the Memory Timings sets to [Manual], the field is adjustable. Specifies
the refresh rate of the DIMM requiring the most frequent refresh.

1T/ 2T Memory Timing

This item controls the SDRAM command rate. Select [1T] makes SDRAM signal
controller to run at 1T (T=clock cycles) rate. Selecting [2T] makes SDRAM
signal controller run at 2T rate.

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750i Mainboard

Spread Spectrum

When the motherboard’s clock generator pulses, the extreme values (spikes) of the
pulses create EMI (Electromagnetic Interference). The Spread Spectrum function
reduces the EMI generated by modulating the pulses so that the spikes of the pulses
are reduced to flatter curves. If you do not have any EMI problem, leave the setting at
Disabled for optimal system stability and performance. But if you are plagued by EMI,
set to Enabled for EMI reduction. Remember to disable Spread Spectrum if you are
overclocking because even a slight jitter can introduce a temporary boost in clock
speed which may just cause your overclocked processor to lock up.

Important

1.If you do not have any EMI problem, leave the setting at [Disabled] for

optimal system stability and performance. But if you are plagued by EMI,
select the value of Spread Spectrum for EMI reduction.

2.The greater the Spread Spectrum value is, the greater the EMI is reduced,

and the system will become less stable. For the most suitable Spread
Spectrum value, please consult your local EMI regulation.

3.Remember to disable Spread Spectrum if you are overclocking because

even a slight jitter can introduce a temporary boost in clock speed which
may just cause your overclocked processor to lock up.

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Hardware Setup

CPU and Memory Clock Overclocking

The FSB Clock/ Memory Clock are the items for you to overclock the CPU
and the Memory. Please refer to the descriptions of these fields for more
information.

Important

This motherboard supports overclocking greatly. However, please make sure
your peripherals and components are bearable for some special settings.
Any operation that exceeds product specification is not recommended. Any
risk or damge resulting from improper operation will not be under our product
warranty.

Two ways to save your system from failed overclocking...

Reboot

1. Press the Power button to reboot the system three times. Please note that, to

avoid electric current to affect other devices or components, we suggest
an interval of more than 10 seconds among the reboot actions.

2. At the fourth reboot, BIOS will determine that the previous overclocking is

failed and restore the default settings automatically. Please press any key to
boot the system normally when the following message appears on screen.

Warning!!! The previous performance of overclocking is failed,
and the system is restored to the defaults setting.

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750i Mainboard

Slots

PCI (Peripheral Component Interconnect) Express Slot

The PCI Express slot supports the PCI Express interface expansion card.
The PCI Express x16 slot supports up to 4.0 GB/s transfer rate.
The PCI Express x1 slot supports up to 250 MB/s transfer rate.

PCI Express x16 Slot

PCI Express x1 Slot

PCI (Peripheral Component Interconnect) Slot

The PCI slot supports LAN card, SCSI card, USB card, and other add-on cards that
comply with PCI specifications.

32-bit PCI Slot

Important

When adding or removing expansion cards, make sure that you unplug the
power supply first. Meanwhile, read the documentation for the expansion card
to configure any necessary hardware or software settings for the expansion
card, such as jumpers, switches or BIOS configuration.

PCI Interrupt Request Routing

The IRQ, acronym of interrupt request line and pronounced I-R-Q, are hardware lines
over which devices can send interrupt signals to the microprocessor. The PCI IRQ
pins are typically connected to the PCI bus pins as follows:

Order 1 Order 2 Order 3 Order 4

PCI Slot 1 INT E# INT F# INT G# INT H#
PCI Slot 2 INT F# INT G# INT H# INT E#

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