AMD 790GX User manual

USER'S MANUAL
Of
AMD 790GX & AMD SB750
Based
M/B For Socket AM3 Series Quad Core
Processor
Trademark:
* Specifications and information contained in this documentation are furnished for information use only, and are
subject to change at any time without notice, and should not be construed as a commitment by manufacturer.
NO. G03-MA3890X2-F
Rev ： 1.0
Release date: July, 2010

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Environmental Safety Instruction
Avoid the dusty, humidity and temperature extremes. Do not place the product in any
area where it may become wet.
0 to 40 centigrade is the suitable temperature. (The figure comes from the request of
the main chipset)
Generally speaking, dramatic changes in temperature may lead to contact malfunction
and crackles due to constant thermal expansion and contraction from the welding
spots‟ that connect components and PCB. Computer should go through an adaptive
phase before it boots when it is moved from a cold environment to a warmer one to
avoid condensation phenomenon. These water drops attached on PCB or the surface
of the components can bring about phenomena as minor as computer instability
resulted from corrosion and oxidation from components and PCB or as major as short
circuit that can burn the components. Suggest starting the computer until the
temperature goes up.
The increasing temperature of the capacitor may decrease the life of computer. Using
the close case may decrease the life of other device because the higher temperature in
the inner of the case.
Attention to the heat sink when you over-clocking. The higher temperature may
decrease the life of the device and burned the capacitor.
Environmental Protection Announcement
Do not dispose this electronic device into the trash while discarding. To minimize pollution
and ensure environment protection of mother earth, please recycle.

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CHAPTER 1 INTRODUCTION OF AMD 790GX MOTHERBOARDS
1-1 FEATURES OF MOTHERBOARD...............................................................1
1-1.1 SPECIAL FEATURES OF MOTHERBOARD.................................2
1-2 SPECIFICATION .........................................................................................3
1-3 ITEM CHECKLIST.......................................................................................3
1-4 LAYOUT DIAGRAM ....................................................................................4
CHAPTER 2 HARDWARE INSTALLATION
2-1 CPU INSTALLATION .................................................................................5
2-2 INSTALL MEMORY.....................................................................................6
2-3 EXPANSION SLOTS...................................................................................7
CHAPTER 3 CONNCTORS, HEADERS & JUMPERS SETTING
3-1 CONNECTORS............................................................................................8
3-2 HEADERS ...................................................................................................11
3-3 JUMPER SETTING......................................................................................13
CHAPTER 4 USEFUL HELP
4-1 HOW TO UPDATE BIOS.............................................................................15
4-2 TROUBLE SHOOTING................................................................................15
APPENDIX 1..............................................................................................................16
TABLE OF CONTENT

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Chapter 1
Introduction of AMD 790GX Motherboards
1-1 Features of motherboard
The AMD 790GX chipset motherboard series are based on the latest AMD 790GX
Chipsetand the SB750 chipset which supports the following AM3 CPU in the 95W
range: Phenom II x 6;Phenom II x 4；Phenom II x 3；Phenom II x2；Athlon II x4；Athlon
II x3；Athlon II x2；Sempron The board also support socket AM2 CPU udder 65W and
socket AM2+ CPU under 95 W. With an integrated low-latency high-bandwidth DIMM
memory controller and a highly-scalable Hyper Transport technology-based system
bus up to HT 3.0. AMD 790GX Platform Processor Chipset motherboard series deliver
the outstanding system performance and professional desktop platform solution.
The AMD 790GX Series motherboard comes with a DDRII memory controller for dual
channel DDRII 400/DDRII 533/ DDRII 667/DDRII 800 memory module with capacity
expansible up to 8GB. These motherboards are embedded with SB750 chipset of
providing ULTRA ATA 133 connectors and Serial ATA2 with RAID 0/1/5/10 functions
which support up to two IDE and six Serial ATA2 devices to accelerate hard disk
drives and guarantee the data security without failure in advanced computing
performance.
The AMD 790GX motherboards provide PCI-E Gigabit LAN chip which support
10/100/1000Mbps data transfer rate. And the embedded ALC662 6-channel HD Audio
CODEC is fully compatible with Sound Blaster Pro standards that offer you with the
home cinema quality and satisfying software compatibility.
AMD 790GX series motherboards offer one PCI-Express 2.0 x16 by 16 deliver up to
8Gbyte/sec data transfer rate at each relative direction. The AMD 790GX
motherboards also carry two 32-bit PCI slots guarantee the rich connectivity for the
I/O peripheral devices.
Embedded USB controllers as well as capability of expanding to 8 of USB2.0
functional ports delivering 480Mb/s bandwidth of rich connectivity, these
motherboards meet the future USB demands which are also equipped with hardware
monitor function on system to monitor and protect your system and maintain your
non-stop business computing.
Some special features---CPU Thermal Throttling/ CPU VID /CPU VcoreOC-CON
/G.P.I.Funtion in this motherboard are designed for power user to use the
over-clocking function in more flexible ways. But please be caution that the
over-clocking maybe causes the fails in system reliabilities. This motherboard
provides the guaranteed performance and meets the demands of the next generation
computing. But if you insist to gain more system performance with variety possibilities
of the components you choose, please be careful and make sure to read the detailed
descriptions of these value added product features, please get them in the coming
section.

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1-1.1 Special Features of Motherboard
CPU Thermal Throttling Technology (The CPU Overheat Protection Technology)
To prevent the increasing heat from damage of CPU or accidental shutdown while at
high workload, the CPU Thermal Throttling Technology will force CPU to enter
partially idle mode from 87.5% to 12.5% according to preset CPU operating
temperature in BIOS (from 40℃to 90℃). When the system senses the CPU
operating temperature reaching the preset value, the CPU operating bandwidth will be
decreased to the preset idle percentage to cool down the processor. When at
throttling mode the beeper sound can be optionally selected to indicate it is in working.
CPU VID---Shift to Higher Performance
The CPU voltage can be adjusted for the precisely over-clocking of extra demanding
computing performance.
CPU Vcore Input/Output Solid Capacitors(High-polymer Solid Electrolysis
Aluminum Capacitors)
CPU Vcore Input and Output adopt OC-CON solid capacitors. The working
temperature is from 55 degrees Centigrade below zero to 125 degrees Centigrade,
Solid capacitors possess superior physical characteristics that can be while reducing
the working temperature between 20 degrees Centigrade each time, intact extension
10 times of effective product operation lives, at not rising degrees Centigrade of
working temperatures each time a relative one, life of product decline 10% only too.
G.P.I Function
G.P.I is a technology with remarkable power saving function: when you are using a
computer with G.P.I mold turned on, you save averagely 10.5W in power consumption
in the whole process than normal computer without G.P.I technology.

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1-2 Specification
Spec
Description
Design
Micro ATX form factor; 4 layers PCB ;size:24.5cm*21.0cm
Chipset
AMD 790GX North Bridge Chipset
AMD SB750 South Bridge Chipset
CPU Socket
Support AM2 CPU under 65W and AM2+ CPU under 95W
Support AM3 the following CPU under 95W: Phenom II x 6；
Phenom II x 4；Phenom II x 3；Phenom II x2；Athlon II x4；Athlon
II x3；Athlon II x2；Sempron AM3 CPU
Support HT 3.0
Memory Socket
240-pin DDRII Module slot 2
Support 2pcs DDRII 400/DDRII 533/DDRII 667/ DDRII 800 memory
modules expandable to 8GB
Dual channel supported
Expansion Slot
1 pcs PCI-Express 2.0 x16 by 16 lane
2 pcs 32-bit PCI slots
Integrate IDE and
Serial ATA2 RAID
One IDE controllers support PCI Bus Mastering, ATA PIO/DMA
and the ULTRA DMA 33/66/100/133 functions that deliver the data
transfer rate up to 133 MB/s for 2 IDE Devices and for 6 Serial
ATA2 ports providing 300 MB/sec data transfer rate with RAID
0/1/5/10 functions
Gigabit LAN
Integrated PCI-E gigabit LAN chip.
Support Fast Ethernet LAN function of providing
10Mb/100Mb/1000 Mb/s data transfer rate
6 CH-Audio
Realtek ALC662 HD Audio 6-channel Audio Codec integrated
Audio driver and utility included
BIOS
AMI 8MB SMT Flash ROM BIOS
Multi I/O
PS/2 keyboard and PS/2 mouse connectors
Coaxial SPDIF Out Connector x1
DVI Connector x1
VGA Connector x1
USB2.0 port x 4 and header x 2
RJ-45 LAN connector x1
Audio connector x1
Hard disk driver connector x 1/ SATA connector x 6
Serial Port header x1
HDMI_SPDIF header x1
1-3 Item Checklist
Motherboard
DVD for motherboard utilities
User‟s manual
Hard disk cable
I/O back panel shied

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1-4 Layout Diagram
Front Panel Header
ATA 133 IDE
Conn.(IDE1)
CPU Socket
ATX Power Conn.
PCI Slots
PS2 KB/MS Port
Audio Connector
DDRII Slot x 2
ATX 12V Power Connector
Realtek ALC662
Audio Decode Chip
Gigabit LAN
Chip
Speaker
USB Headers
Power Led
AMD 790GX Chipset
Front Panel
Audio Header
K/B,USB Power On(JP1)
COM
Header
USB Connector
PS/2 Mouse
PS/2 Keyboard
Line-OUT
MIC-IN
USB Connector
CPUFAN
SYS FAN1
PCI Express2.0 x16
@16-lane
VGA Connector
over DVI Connector
SYSFAN1
VGA Connector
Line-IN
RJ-45 LAN
Serial-ATAII Connectors
SATA1, 2, 3,4,5,6
HDMI-SPDIF
Header
Power-saving LED
DVI Connector
SPDIF_OUT Connector
SPDIF_OUT
Connector
RJ-45 over
USB Connector
AMD SB 750 Chipset
JBAT

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Chapter 2
Hardware Installation
WARNING! Turn off your power when adding or removing expansion cards or
other system components. Failure to do so may cause severe
damage to both your motherboard and expansion cards.
2-1 CPU Installation
This motherboard provides a socket surface mount, Zero Insertion Force (ZIF) CPU
AM2 socket, referred to as the mPGA940 socket that supports AMD AM3/MA2+/AM2
CPU.
The CPU that comes with the motherboard should have a cooling FAN attached to
prevent overheating. If this is not the case, then purchase a correct cooling FAN
before you turn on your system.
WARNING! Be sure that there is sufficient air circulation across the processor‟s
heat sink and CPU cooling FAN is working correctly, otherwise it
may cause the processor and motherboard overheat and damage,
you may install an auxiliary cooling FAN, if necessary.
To install a CPU, first turn off your system and remove its cover. Locate the ZIF socket
and open it by first pulling the level sideways away from the socket then upward to a
90-degree angle. Insert the CPU with the correct orientation as shown below. The
notched corner should point toward the end of the level. Because the CPU has a
corner pin for two of the four corners, the CPU will only fit in the orientation as shown.
CPU ZIF mPGAB Socket
Colden Arrow
SocketAM2
When you put the CPU into the ZIF socket, No force required to insert of the CPU, and
then press the level to locate position slightly without any extra force.

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2-2 Install Memory
This motherboard provides two 240-pin DDRII DUAL INLINE MEMORY MODULES
(DIMM) socket for DDRII memory modules expansible to maximum memory volume
of 8 GB.
Valid Memory Configuration
Bank
240-Pin DIMM
PCS
Maximum Capacity
DIMM1
DDRII 400/ 533/ 667/ 800
X1
4GB
DIMM2
DDRII 400/ 533/ 667/ 800
X1
4GB
Total
System Memory (Max 4 GB)
2
8GB
Recommend DIMM Module Combination
1. One DIMM Memory Module ----Plug in DIMM1.
2. Two DIMM Memory Modules---Plug in DIMM1 and DIMM2 for Dual channel
function.
Dual channel Limited!
1. Dual channel function only supports when 2 DIMM Modules plug in both DIMM1
& DIMM2.
2. Memory modules plugged in DIMM1 & DIMM2 must be of the same type, same
size, and same frequency for dual channel function.
Install DDR SDRAM modules to your motherboard is not difficult, you can refer to
figure below to see how to install a DDRII 400/DDRII 533/ DDRII 667/DDRII 800
memory module.
DI MM2 (BA NK2 +BA NK3)
DI MM1 (BA NK0+BANK1)
DIMM1&DIMM2:
Dual Channel
NOTE! When you install DIMM module fully into the DIMM socket the eject tab
should be locked into the DIMM module very firmly and fit into its indention on both
sides.

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2-3 Expansion Slots
One PCI-Express2.0 x16@16 lane graphic slot offer 8Gbyte/sec data transfer rate at
each relative direction and up to 16Gbyte/sec concurrent bandwidth at full speed.
Fully compliant to the PCI Express Base Specification revision2.0, support PCI
Express VGA card, and other PCI Express device. Two 32-bit PCI slots guarantee the
rich connectivity for the I/O of peripherals.
PCI-E 2.0x16 Slot@16-lane
32-bit PCI Slots

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Chapter 3
Connectors, Headers & Jumper Setting
3-1 Connectors
(1) Power Connector (24-pin block): ATXPWR1
ATX Power Supply connector:
This is a new defined 24-pins
connector that usually comes
with ATX case. The ATX Power
Supply allows using soft power
on momentary switch that
connect from the front panel
switch to 2-pins Power On jumper
pole on the motherboard. When
the power switch on the back of
the ATX power supply turned on,
the full power will not come into
the system board until the front
panel switch is momentarily
pressed. Press this switch again will turn off the power to the system board.
** We recommend that you use an ATX 12V Specification 2.0-compliant power
supply unit (PSU) with a minimum of 350W power rating. This type has 24-pin
and 4-pin power plugs.
** If you intend to use a PSU with 20-pin and 4-pin power plugs, make sure that the
20-pin power plug can provide at least 15A on +12V and the power supply unit
has a minimum power rating of 350W. The system may become unstable or may
not boot up if the power is inadequate.
** Please refer to Figure 1 for 20-pin power plug connection. Power plug and
motherboard power connectors has adopted key design to avoid installation
mistake through connection can be made easily if in the proper direction. If the
installation direction is incorrect and you make the connection by force both the
board and the power supply can be burned. Please see to it that the direction is
correct during installation.
Figure 1: 20-pin power plug Figure2: 24-pin power plug
Pin 1
ROW1
ROW2
24-Pin
ROW1
ROW2
Pin 1
20-Pin
PIN
ROW1
ROW2
1
3.3V
3.3V
2
3.3V
-12V
3
GND
GND
4
5V
Soft Power On
5
GND
GND
6
5V
GND
7
GND
GND
8
Power OK
-5V
9
+5V (for Soft Logic)
+5V
10
+12V
+5V
11
+12V
+5V
12
+3V
GND

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(2) ATX 12V Power Connector (8-pin block): ATX12V1
This is a new defined 8-pins connector that usually comes with ATX Power
Supply. The ATX Power Supply which fully supports Socket AM2+/AM3
processor must including this connector for support extra 12V voltage to
maintain system power consumption. Without this connector might cause
system unstable because the power supply can not provide sufficient current for
system.
Pin 1
(3) PS/2 Mouse & PS/2 Keyboard Connector: KB
The connectors are for PS/2 keyboard and PS/2 Mouse.
(4) USB Port connector: CN5/ UL1 for USB
The connectors are 4-pin connector that connects USB devices to the system
board.
(5) LAN Port connector: UL1 for RJ-45 LAN
The connector is standard RJ45 connector for Network. It supports
10M/100Mb/1000Mb s data transfer rate
(6) Audio Line-In, Line-Out, MIC Connector: AUDIO
These Connectors are 3 Phone-Jack for LINE-OUT, LINE-IN, and MIC audio
connections.
Line-in: (BLUE) Audio input to sound chip
Line-out: (GREEN) Audio output to speaker
MIC: (PINK) Microphone Connector
RJ-45 LAN
PS/2 Mouse
PS/2 Keyboard
Line-IN
Line-OUT
MIC-IN
VGA
USB Connectors
DVI
SPDIF_OUT

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(7) Primary IDE Connector (40-pin block): IDE1
This connector supports the provided IDE hard disk ribbon cable. After connecting the
single plug end to motherboard, connect the two plugs at other end to your hard
disk(s). If you install two hard disks, you must configure the second drive to Slave
mode by setting its jumpers accordingly. Please refer to the documentation of your
hard disk for the jumper settings.
IDE Connector
Pin 1
IDE1
Two hard disks can be connected to each connector. The first HDD is referred to
as the “Master” and the second HDD is referred to as the “Slave”.
For performance issues, we strongly suggest you don‟t install a CD-ROM or
DVD-ROM drive on the same IDE channel as a hard disk. Otherwise, the system
performance on this channel may drop.
(8) Serial-ATAII Port connector: SATA1~SATA6
This connector supports the provided Serial ATA2 IDE hard disk cable to
connecting the motherboard with serial ATAII hard disk.
Serial-ATA2 Port Connector
SATA4
SATA2
SATA6
SATA5
SATA3
SATA1
(9) D-Sub 15-pin Connector: VGA
VGA connector is the 15-pin D-subminiature female connector; it is for the
display devices, such as the CRT monitor, LCD monitor and so on.
(10) Digital Visual Interface: DVI1
This interface standard designed to maximize the visual quality of digital display
devices such as flat panel LCD computer displays and digital projectors.
(11) SPDIF Out connectors: SPDIF_OUT1
The SPDIF output is capable of providing digital audio to external speakers or
compressed AC3 data to an external Dolby digital decoder. Use this feature only
when your stereo system has digital input function.

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3-2 Headers
(1) Line-Out/MIC Header for Front Panel (9-pin): AUDIO1
These headers connect to Front Panel Line-out, MIC connector with cable.
Line-Out, MIC Headers
AUDIO
Pin 1
Lineout2-L
Lineout2-R
Sense-FB
Audio-GND
LINE2-JD
Audio-JD
2
9
10
KEY
MIC2-L
MIC2-JD
MIC2-R
(2)USB Port Headers (9-pin): USB1/USB2
These headers are used for connecting the additional USB port plug. By
attaching an option USB cable, your can be provided with two additional USB
plugs affixed to the back panel.
USB Port Headers
Pin 1
VCC
-DATA
GND
+DATA
VCC
OC
-DATA
GND
+DATA
(3) Speaker connector: SPEAK1
This 4-pin connector connects to the case-mounted speaker. See the figure
below.
(4) Power LED: PWR LED/PWRLED1
The Power LED is light on while the system power is on. Connect the Power
LED from the system case to this pin.
(5) IDE Activity LED: HD LED
This connector connects to the hard disk activity indicator light on the case.
(6) Reset switch: RESET
This 2-pin connector connects to the case-mounted reset switch for rebooting
your computer without having to turn off your power switch. This is a preferred
method of rebooting in order to prolong the lift of the system‟s power supply.
See the figure below.
(7) Power switch: PWR BTN
This 2-pin connector connects to the case-mounted power switch to power
ON/OFF the system.

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System Case Connections
HDLED
RESET
VCC5
GND
VCC5
PWR LED
PWRBTN
PWRBTN
PWRLED
HDDLE
D
RSTSW
NC
GND
JW FP
Pin 1
SPEAK
SPKR
GND
NC
VCC5
Pin 1
PWRLED
Pin 1
(8) FAN Power Headers: SYSFAN1 (3-pin), CPUFAN (4-pin)
These connectors support cooling fans of 350mA (4.2 Watts) or less, depending
on the fan manufacturer, the wire and plug may be different. The red wire should
be positive, while the black should be ground. Connect the fan‟s plug to the
board taking into consideration the polarity of connector.
FAN Power Headers
SYSFAN1
SYSFAN2
CPUFAN
1
4
GND
+12V
CPUFAN IN
CPUFAN OUT
1
3
1
3
(9) Serial COM Port header: COM1
COM1 is the 9-pin block pin-header.
Serial COM Port 9-pin Block
Pin1

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(10) HDMI-SPDIF Out header: HDMI_SPDIF
The SPDIF output is capable of providing digital audio to external speakers or
compressed AC3 data to an external Dolby digital decoder. Use this feature only
when your stereo system has digital input function. Some of the VGA Card need
connect SPDIF-IN Connector，so its HDMI Port can make sounds .
HDMI_SPDIF Header
1
GND
2
HDMI_SPDIF_OUT

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3-3 Jumper Setting
(1) Keyboard/USB function Enabled/Disabled: JP1
Keyboard & USB Power On Setting
2-3 Closed K/B,USB Power ON Enabled
JP1
JP1
1-2 Closed K/B,USB Power ON Disable (Default)
(1) CMOS RAM Clear (3-pin): JBAT
A battery must be used to retain the motherboard configuration in CMOS RAM
short 1-2 pins of JBAT to store the CMOS data.
To clear the CMOS, follow the procedure below:
1. Turn off the system and unplug the AC power
2. Remove ATX power cable from ATX power connector
3. Locate JBAT and short pins 2-3 for a few seconds
4. Return JBAT to its normal setting by shorting pins 1-2
5. Connect ATX power cable back to ATX power connector
Note: When should clear CMOS
1. Troubleshooting
2. Forget password
3. After over clocking system boot fail
CMOS RAM Clear Setting
2-3 Closed Clear CMOS
JBAT
JBAT
1-2 Closed Normal

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Chapter 4
Useful Help
4-1 How to Update BIOS
Step1. Prepare a boot disc. (You may make one by click START click RUN type
SYS A: click OK)
Step2. Download upgrade tools and the latest BIOS files of the motherboard from
official website and then make a copy of it to your bootable floppy disk after
decompressing these files
Step3. Insert the disk into A: start your computer and then type in “A:\xxxxxx.BAT”
(xxxxxxx being the file name of the latest BIOS)
Step4. Type Enter to update and flash the BIOS. The system will restart
automatically when BIOS is upgraded.
4-2 Trouble Shooting
Problem
Solution
No power to the system to the all
power light don‟t illuminate, fan inside
power supply doesn‟t turn on.
1. Make sure power cable is security
plugged in. 2. Replace cable. 3.
Contact technical support.
System inoperative. Keyboard lights
are on, power indicator lights are lit,
and hard drive is spinning.
Using ever pressure on both ends of
the DIMM, press down firmly until the
module snaps into places.
System doesn‟t boot from hard disk
drive, can be booted from optical drive.
1. Check cable running from disk to
disk controller board. .Make sure both
ends are securely plugged in, check
the drive type in the standard CMOS
setup. 2. Backing up the hard drive is
extremely important .All hard disks are
capable of breaking down at any time.
System only boots from optical
drive .Hard disk can be read and
applications can be used but booting
from hard disk is impossible.
1. Back up date and applications files.
2. Reformat the hard drive. Reinstall
applications and date using backup
disks.
Screen message says “Invalid
Configuration” or “CMOS Failure”
Review system„s equipment. Make
sure correct information on is in setup.
Can not boot system after installing
second hard drive.
1. Set master /slave jumpers correctly.
2. Run SETUP program and select
correct drive types. Call the drive
manufacture for compatibility with
other drives.

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Appendix I
Subject 1: Regarding the Application of 3-Phase or 3+1 Phase
Power Supply Mold
As a result of the increasing power consumption demand from
many AMD CPUs in current market, we suggest not to use a CPU
that demands more than 65W power consumption at work for an
AMD CPU compliant board that comes with power supply design
as 3 phase or 3+1 phase mold and MOSFET design as working in
High SideX1 and Low SideX1 mold so as to avoid MOSFET getting
burned or other phenomena like a halted system or system
instability. So please take notice of the CPU you are using and make sure that it is one
that demand not more than 65 W to ensure long-term working order.
Note：
1. The relation between CPU Power Consumption Amount and Power Phase:
depending on difference in voltage rating, one-phase of power can provide
25~30W to the motherboard.
2. 3- Phase Power Supply Mold: motherboard with 3 inductances for CPU power
supply, and each inductance carries with it 2 MOSFET (6 MOSFETs in total)
(Figure1);3+1–Phase Power Supply Mold: motherboard with 4 inductances for
CPU power supply, and each inductance carries with it 2 MOSFET (8 MOSFETs
in total) (Figure2).
Figure 1
Figure 2
Solution：
We recommend users choose motherboards with power design of 4-phase, 4+1
phase or more for CPUs that demand 89W or 95W power consumption.
We recommend users choose motherboards with power design of 5-phase, 5+1
phase or more for CPUs that demand 125W or 140W power consumption.

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Subject 2: Suggestion on choosing electric fan
Both the amount of electric current to MOSFET and the heat
produced from the motherboard go up as AMD‟s CPU power
consumption increases. In this case we recommend users select a
CPU fan with air outlet towards MOSFET so that CPU fan can carry
away heat produced by MOSFET, for better heat dissipation effects.
At the same time we suggest using well-ventilated cases to maintain
temperature as 38℃approximately inside. (38℃is recommended by CPU
manufactures).
Figure 1---- CPU Fan can not blow off the heat produced by MOSFET. We suggest
not to using fans of this kind.
Figure 2---- CPU Fan can blow off the heat produced by MOSFET. We suggest using
fans of this kind.
Cool air flowing in
Hot air flowing out
Cool air flowing in
Hot air flowing out