MSI X299 Tomahawk User Manual
Unpacking
Thank you for buying the MSI® X299 TOMAHAWK/ X299 TOMAHAWK AC motherboard.
Check to make sure your motherboard box contains the following items. If something
is missing, contact your dealer as soon as possible.
Motherboard
I/O Shield
SATA Cable Labels
Drivers & Utilities
Disc
SATA Cable x2
Case Badge
Motherboard User
Guide
SLI HB Bridge M x1
Antenna x2
(Optional)
* These pictures are for reference only and may vary without notice.
** The packing contents may vary according to the country you purchased.
Unpacking
1
Safety Information
y The components included in this package are prone to damage from electrostatic
discharge (ESD). Please adhere to the following instructions to ensure successful
computer assembly.
y Ensure that all components are securely connected. Loose connections may cause
the computer to not recognize a component or fail to start.
y Hold the motherboard by the edges to avoid touching sensitive components.
y It is recommended to wear an electrostatic discharge (ESD) wrist strap when
handling the motherboard to prevent electrostatic damage. If an ESD wrist strap is
not available, discharge yourself of static electricity by touching another metal object
before handling the motherboard.
y Store the motherboard in an electrostatic shielding container or on an anti-static pad
whenever the motherboard is not installed.
y Before turning on the computer, ensure that there are no loose screws or metal
components on the motherboard or anywhere within the computer case.
y Do not boot the computer before installation is completed. This could cause
permanent damage to the components as well as injury to the user.
y If you need help during any installation step, please consult a certified computer
technician.
y Always turn off the power supply and unplug the power cord from the power outlet
before installing or removing any computer component.
y Keep this user guide for future reference.
y Keep this motherboard away from humidity.
y Make sure that your electrical outlet provides the same voltage as is indicated on the
PSU, before connecting the PSU to the electrical outlet.
y Place the power cord such a way that people can not step on it. Do not place anything
over the power cord.
y All cautions and warnings on the motherboard should be noted.
y If any of the following situations arises, get the motherboard checked by service
personnel:
Liquid has penetrated into the computer.
The motherboard has been exposed to moisture.
The motherboard does not work well or you can not get it work according to user
guide.
The motherboard has been dropped and damaged.
The motherboard has obvious sign of breakage.
y Do not leave this motherboard in an environment above 60°C (140°F), it may damage
the motherboard.
Safety Information
2
Quick Start
Preparing Tools and Components
Intel® LGA 2066 CPU
DDR4 Memory
SATA DVD Drive
CPU Fan Thermal Paste
Chassis
SATA Hard Disk Drive
Power Supply Unit
Graphics Card
Phillips Screwdriver
A Package of Screws
Quick Start
3
Installing a Processor
1
3
2
https://youtu.be/ecdkLMmkya4
4
5
6
Quick Start
4
789
10
11
12
13
Installing DDR4 memory
http://youtu.be/T03aDrJPyQs
1
2
2
DIMMC1
3
Quick Start
5
Connecting the Front Panel Header
RESET SW
POWER SW
POWER LED+
POWER LED-
HDD LED
http://youtu.be/DPELIdVNZUI
Quick Start
6
2 10
1
JFP1
1 HDD LED + 2 Power LED +
3 HDD LED - 4 Power LED -
5 Reset Switch 6 Power Switch
9
7 Reset Switch 8 Power Switch
9 Reserved 10 No Pin
HDD LED
POWER LED
RESET SW
HDD LED
JFP1
HDD LED HDD LED +
POWER LED POWER LED +
Installing the Motherboard
1
2
BAT1
Quick Start
7
Installing SATA Drives
http://youtu.be/RZsMpqxythc
2
1
3
Quick Start
8
5
4
Installing a Graphics Card
http://youtu.be/mG0GZpr9w_A
1
3
2
5
4
6
Quick Start
9
Connecting Peripheral Devices
(Optional)
10
Quick Start
Connecting the Power Connectors
http://youtu.be/gkDYyR_83I4
ATX_PWR1
CPU_PWR1
Quick Start
11
Power On
1
2
3
12
4
Quick Start
Contents
Unpacking .............................................................................................................. 1
Safety Information ................................................................................................. 2
Quick Start ............................................................................................................. 3
Preparing Tools and Components .......................................................................... 3
Installing a Processor ............................................................................................. 4
Installing DDR4 memory ........................................................................................ 5
Connecting the Front Panel Header ....................................................................... 6
Installing the Motherboard ..................................................................................... 7
Installing SATA Drives.............................................................................................8
Installing a Graphics Card ...................................................................................... 9
Connecting Peripheral Devices ............................................................................ 10
Connecting the Power Connectors ....................................................................... 11
Power On............................................................................................................... 12
Specifications ....................................................................................................... 16
Block Diagram .................................................................................................... 22
Rear I/O Panel ..................................................................................................... 23
LAN Port LED Status Table................................................................................... 23
Audio Ports Configuration .................................................................................... 23
Realtek HD Audio Manager .................................................................................. 24
Installing Antennas (Optional) .............................................................................. 26
Overview of Components .................................................................................... 27
CPU Socket ........................................................................................................... 29
DIMM Slots ............................................................................................................ 30
PCI_E1~6: PCIe Expansion Slots .......................................................................... 33
PCIe slots bandwidth table ................................................................................... 33
U2_1: U.2 Connector ............................................................................................. 36
M2_1~2: M.2 Slots (Key M) ................................................................................... 37
SATA1~8: SATA 6Gb/s Connectors ....................................................................... 38
CPU_PWR1, ATX_PWR1: Power Connectors ....................................................... 40
VRAID1: Virtual RAID on CPU Connector ............................................................. 40
JFP1, JFP2: Front Panel Connectors ................................................................... 41
JUSB3, JUSB4: USB 3.1 Gen1 Connectors........................................................... 41
JUSB5: USB 3.1 Gen2 Type-C Connector ............................................................. 42
JUSB1~2: USB 2.0 Connectors ............................................................................. 43
JTPM1: TPM Module Connector ........................................................................... 43
Contents
13
CPU_FAN1, PUMP_FAN1, SYS_FAN1~4: Fan Connectors ................................... 44
JTBT1: Thunderbolt Add-on Card Connector ...................................................... 44
JAUD1: Front Audio Connector ............................................................................45
JCI1: Chassis Intrusion Connector ....................................................................... 45
BIOS_SW1: Multi-BIOS Switch ............................................................................. 46
JBAT1: Clear CMOS (Reset BIOS) Jumper ........................................................... 47
POWER1, RESET1: Power Button, Reset Button ................................................. 47
JLED1: RGB LED connector ................................................................................. 48
Onboard LEDs ...................................................................................................... 49
EZ Debug LEDs ..................................................................................................... 49
DIMM LEDs ........................................................................................................... 49
XMP LED ............................................................................................................... 49
Fan LEDs ............................................................................................................... 50
PCIe x16 slot LEDs................................................................................................ 50
Debug Code LED ................................................................................................... 51
Debug Code LED Table ......................................................................................... 51
ACPI States Codes ................................................................................................ 53
CPU Temperature ................................................................................................. 53
BIOS Setup ........................................................................................................... 54
Entering BIOS Setup ............................................................................................. 54
Resetting BIOS ...................................................................................................... 55
Updating BIOS ....................................................................................................... 55
EZ Mode ................................................................................................................ 57
Advanced Mode .................................................................................................... 59
SETTINGS .............................................................................................................. 60
Advanced ............................................................................................................... 60
Boot ....................................................................................................................... 65
Security ................................................................................................................. 66
Save & Exit ............................................................................................................ 67
OC .......................................................................................................................... 68
M-FLASH .............................................................................................................. 74
OC PROFILE .......................................................................................................... 75
Software Description ........................................................................................... 76
Installing Windows® 10 ......................................................................................... 76
Installing Drivers .................................................................................................. 76
Installing Utilities ................................................................................................. 76
APP MANAGER ..................................................................................................... 77
LIVE UPDATE 6 ...................................................................................................... 78
COMMAND CENTER ............................................................................................. 80
14
Contents
GAMING APP ......................................................................................................... 84
X-BOOST ............................................................................................................... 89
MYSTICLIGHT ........................................................................................................ 91
MSI SMART TOOL ................................................................................................. 93
RAMDISK............................................................................................................... 95
GAMING LAN MANAGER ...................................................................................... 96
DRAGON EYE ........................................................................................................ 98
Nahimic 2 .............................................................................................................. 99
XSplit Gamecaster V2 ......................................................................................... 103
SteelSeries Engine 3 .......................................................................................... 107
®
Intel
Extreme Tuning Utility .............................................................................. 109
CPU-Z.................................................................................................................. 110
TriDef VR ............................................................................................................. 111
TriDef SmartCam ................................................................................................ 114
RAID Configuration ............................................................................................ 115
Using Intel® Rapid Storage Technology Option ROM ......................................... 115
Degraded RAID Array ......................................................................................... 118
M.2 PCIe SSD RAID ............................................................................................. 120
Intel® Optane™ Memory Configuration ............................................................ 123
System Requirements ....................................................................................... 123
Installing the Intel
Removing the Intel
Troubleshooting .................................................................................................. 126
®
Optane™ memory .............................................................. 123
®
Optane™ memory ............................................................. 125
Troubleshooting ................................................................................................ 127
Contents
15
Specifications
CPU
Chipset Intel
Memory
Expansion Slots
LGA2066 Socket
support 4-channels DDR4**
support 2-channels DDR4**
* For the latest information about memory, please visit http://www.msi.com
** Please refer the DIMM Slots section for more details.
* The PCI_E3 lanes are supported by PCH. Please refer to page 33 for PCIe slots
bandwidth table.
®
y Supports Intel
®
X299 Chipset
Core™ X-Series Processor Family for
y 8x DDR4 memory slots, support up to 128GB*
X-series processor support DDR4 4266+(OC)/ 4133(OC)/
4000(OC)/ 3866 (OC)/ 3733(OC)/ 3600(OC)/ 3466(OC)/
3400(OC)/ 3333(OC)/ 3300(OC)/ 3200(OC)/ 3000(OC)/
2800(OC)/ 2666/ 2400/ 2133 MHz*
y Quad channel memory architecture with the CPU that
y Dual channel memory architecture with the CPU that
y Supports Intel
®
Extreme Memory Profile (XMP)
y 4x PCIe 3.0 x16 slots
Support x16/ x4*/ x16/ x8 mode with the 44-lane CPU.
Support x16/ x4*/ x8/ x4 modes with the 28-lane CPU.
Support x8/ x4*/ x8/ x0, x8/ x4*/ x4/ x4 modes with the
16-lane CPU.
y 2x PCIe 3.0 x1 slots
Multi-GPU
y Supports up to 3-Way AMD
y Supports up to 3-Way NVIDIA
LAN 1x Intel I219-V Gigabit LAN controller
®
Dual Band Wireless-AC 8265 module
y Intel
The Wireless module is pre-install in the M2_3 (Key-E)
Wirsless LAN &
Bluetooth
®
(Optional)
slot.
Supports Wi-Fi 802.11 a/b/g/n/ac, dual band (2.4GHz,
5GHz) up to 867 Mbps speed.
Supports Dual Mode Bluetooth
BLE, 4.2
Continued on next page
Specifications
16
®
CrossFire™ Technology
®
SLI™ Technology
®
2.1, 2.1+EDR, 3.0, 4.0,
Audio
USB
Storage
Continued from previous page
®
y Realtek
ALC1220 Codec
y 7.1-Channel High Definition Audio
y Supports S/PDIF output
®
y ASMedia
ASM3142 Chipset
1x USB 3.1 Gen2 (SuperSpeed USB 10Gbps) Type-A port
on the back panel
2x USB 3.1 Gen2 (Super Speed USB 10Gbps) Type-C
ports(1 port on the back panel, 1 port available through
the internal USB connector)
y ASMedia
®
ASM1074 Chipset
3x USB 3.1 Gen1 (SuperSpeed USB) Type-A ports on the
back panel
®
y Intel
X299 Chipset
5x USB 3.1 Gen1 (SuperSpeed USB) ports (1 port on the
back panel, 4 ports available through the internal USB
connectors)
7x USB 2.0 (High-speed USB) ports (3 ports on the
back panel, 4 ports available through the internal USB
connectors)
®
Intel
X299 Chipset
y 8x SATA 6Gb/s ports*
y 2x M.2 slots (Key M)*
Supports up to PCIe 3.0 x4 and SATA 6Gb/s
M2_1 slot supports 2242/ 2260 /2280 storage devices
M2_2 slot supports 2242/ 2260 /2280/ 22110 storage
devices
Intel Optane™ Memory Ready**
y 1x U.2 port *
Supports PCIe 3.0 x4 NVMe storage
y Supports Intel
* PCI_E3 slot, M.2 slots, U.2 port and SATA ports share the same bandwidth.
Please refer to page 38 for PCI_E3/ U.2/ M.2/ SATA Combination table .
** Please refer to page 123 for Intel
®
Smart Response Technology
®
Optane™ Memory Configuration.
Continued on next page
Specifications
17
RAID
Internal Connectors
Continued from previous page
®
Intel
X299 Chipset
y Supports RAID 0, RAID 1, RAID 5 and RAID 10 for SATA
storage devices
y Supports RAID 0 and RAID 1 for M.2 storage devices*
* M.2 PCIe RAID volume can be created with M.2/Optane Genie. Please refer to
page 120 for M.2 PCIe SSD RAID
y 1x 24-pin ATX main power connector
y 1x 8-pin ATX 12V power connector
y 8x SATA 6Gb/s connectors
y 3x M.2 slots (Key M x2, Key E x1)
y 1x U.2 port
y 2x USB 2.0 connectors (supports additional 4 USB 2.0
ports)
y 2x USB 3.1 Gen1 connectors (supports additional 4 USB 3.1
Gen1 ports)
y 1x USB 3.1 Gen2 Type-C port
y 1x 4-pin CPU fan connector
y 1x 4-pin Water Pump connector
y 4x 4-pin system fan connectors
y 1x Front panel audio connector
y 2x Front panel connectors
y 1x TPM module connector
y 1x Chassis Intrusion connector
y 1x Clear CMOS jumper
y 1x Power button
y 1x Reset button
y 1x Multi-BIOS switch
y 1x RGB LED connector
y 1x Virtual RAID on CPU connector
y 1x Thunderbolt Add-on Card Connector
Continued on next page
18
Specifications
Continued from previous page
y 1x Clear CMOS button
y 1x BIOS Flash back button
y 1x PS/2 keyboard/ mouse combo port
y 3x USB 2.0 Type-A ports
Back Panel
Connectors
I/O Controller NUVOTON NCT6795 Controller Chip
Hardware Monitor
y 4x USB 3.1 Gen1 Type-A ports
y 1x LAN (RJ45) port
y 1x USB 3.1 Gen2 Type-A port
y 1x USB 3.1 Gen2 Type-C port
y 1x Optical S/PDIF OUT connector
y 5x OFC audio jacks
y CPU/System temperature detection
y CPU/System fan speed detection
y CPU/System fan speed control
Form Factor
BIOS Features
y ATX Form Factor
y 12 in. x 9.6 in. (30.5 cm x 24.4 cm)
y 2x 128 Mb flash
y UEFI AMI BIOS
y ACPI 6.0, PnP 1.0a, SM BIOS 3.0
y Multi-language
Continued on next page
Specifications
19
Software
Continued from previous page
y Drivers
y APP MANAGER
y SUPER CHARGER
y COMMAND CENTER
y LIVE UPDATE 6
y MSI SMART TOOL
y DRAGON EYE
y GAMING APP
y X-BOOST
y MYSTIC LIGHT
y RAMDISK
y GAMING LAN Manager
y DPC Latency Tuner
y FAST BOOT
y Nahimic Audio
y XSplit Gamecaster V2
y Tridef VR & Smart Cam
y SteelSeries Engine 3
y WTFast*
y CPU-Z MSI GAMING
®
y Intel
Extreme Tuning Utility
y Google Chrome
™
y Norton
* This offer is valid for a limited period only, for more information please visit
www.msi.com
™
,Google Toolbar, Google Drive
Internet Security Solution
20
MSI Special
Features
Specifications
y Audio Boost 4
y Nahimic 2
y GAMING LAN with Gaming LAN Manager
y Turbo U.2
y Twin Turbo M.2
y Pump Fan
y Smart Fan Control
Continued on next page
MSI Special
Features
Continued from previous page
y Mystic Light
y Mystic Light Extension
y Gaming DNA with bottom LED
y Mystic light SYNC
y EZ DEBUG LED
y M.2 Shield FROZR
y PCI-E Steel Armor
y U.2 Steel Armor
y VR Cover
y Muitl GPU - SLI Technology
y Muitl GPU - CrossFire Technology
y DDR4 Boost
y OC Engine (Clock gen)
y USB with type A+C
y Lightning USB with ASM3142
y Front Lightning USB 3.1 Gen type C
y Military Class 6
y 7000+ Quality Test
y VR Boost
y VR Ready
y Intel WiFi (optional)
y GAMING HOTKEY
y GAMING MOUSE Control
y Click BIOS 5
y BIOS FLASHBACK+
y Dual BIOS
y Quadro SLI Ready
y Quadro Ready
y GAMING Certified
y SteelSeries Certified
Specifications
21
Block Diagram
2/ 4 Channel DDR4 Memory
Processor
1x U.2
2x M.2
8x SATA 6Gb/s
5x USB 3.1 Gen1
7x USB 2.0
PCI Express Bus
Switch
Switch
PS/2 Mouse / Keyboard
LPC Bus
NV6795
Super I/O
DMI 3.0
PCIE Bus
X299 PCH
PCIE Bus
PCIE Bus
Realtek
ALC1220
CS-Out
S/PDIF-Out
PCIe x1 slot
PCIe x1 slot
Intel I219-V
Wi-Fi /
Bluetooth
(Optional)
Line-In/ SS-Out
Line-OutRS-Out
MIC
ASMEDIA
ASM3142
ASMEDIA
ASM1074
3x USB 3.1 Gen2
3x USB 3.1 Gen1
Block Diagram
22
Rear I/O Panel
Clear CMOS
button
PS/2
Wi-Fi Antenna
connectors (Optional)
LAN
Audio Ports
BIOS FLASHBACK+
button
USB 2.0/
BIOS FLASHBACK+
USB 2.0
USB 3.1 Gen2
Type-C
USB 3.1 Gen1
Type-A
Optical
S/PDIF-Out
USB 3.1 Gen2
Type-A
y Clear CMOS button - Power off your computer. Press and hold the Clear CMOS
button for about 5-10 seconds to reset BIOS to default values.
y BIOS FLASHBACK+ port/ button - Please refer to page 56 for Updating BIOS with
BIOS FLASHBACK+.
LAN Port LED Status Table
Link/ Activity LED
Status Description
Off No link
Yellow Linked
Blinking Data activity
Speed LED
Status Description
Off 10 Mbps connection
Green 100 Mbps connection
Orange 1 Gbps connection
Audio Ports Configuration
Audio Ports
Center/ Subwoofer Out ● ●
Rear Speaker Out ● ● ●
Line-In/ Side Speaker Out ●
Line-Out/ Front Speaker Out ● ● ● ●
Mic In
(●: connected, Blank: empty)
Channel
2 4 6 8
Rear I/O Panel
23
Realtek HD Audio Manager
After installing the Realtek HD Audio driver, the Realtek HD Audio Manager icon will
appear in the system tray. Double click on the icon to launch.
Device
Selection
Advanced
Settings
Application
Enhancement
Main Volume
Profiles
Jack Status
Connector
Strings
y Device Selection - allows you to select a audio output source to change the related
options. The check sign indicates the devices as default.
y Application Enhancement - the array of options will provide you a complete guidance
of anticipated sound effect for both output and input device.
y Main Volume - controls the volume or balance the right/left side of the speakers that
you plugged in front or rear panel by adjust the bar.
y Profiles - toggles between profiles.
y Advanced Settings - provides the mechanism to deal with 2 independent audio
streams.
y Jack Status - depicts all render and capture devices currently connected with your
computer.
y Connector Settings - configures the connection settings.
Auto popup dialog
When you plug into a device at an audio jack, a dialogue window will pop up asking you
which device is current connected.
Each jack corresponds to its default setting as shown on the next page.
Rear I/O Panel
24
Audio jacks to headphone and microphone diagram
Audio jacks to stereo speakers diagram
AUDIO INPUT
Audio jacks to 7.1-channel speakers diagram
AUDIO INPUT
Rear Front
Side Center/
Subwoofer
Rear I/O Panel
25
Installing Antennas (Optional)
1. Screw the antennas tight to the Wi-Fi antenna connectors as shown.
2. Place the antennas as high as possible.
Rear I/O Panel
26
Overview of Components
M2_1
PCI_E1
PCI_E2
PCI_E3
PCI_E4
PCI_E5
PCI_E6
DIMMB1
DIMMB2
DIMMA1
JAUD1
SYS_FAN1
DIMMA2
JLED1
SYSFAN4
CPU_PWR1
SYSFAN3
SYSFAN2
JTPM1
CPU Socket
POWER1
BAT1
RESET1
PUMP_FAN1
JUSB2
JFP1
CPU_FAN1
JTBT1
JUSB1
VRAID1*
DIMMC2
DIMMC1
DIMMD2
DIMMD1
ATX_PWR1
JUSB4
JBAT1
JUSB5
M2_2
JUSB3
JCI1
SATA▼1▲2
SATA▼3▲4
SATA▼5▲6
BIOS_SW1
U2_1
JFP2
SATA7
SATA8
Overview of Components
27
Component Contents
Port Name Port Type Page
BIOS_SW1 Multi-BIOS Switch 46
CPU_FAN1, PUMP_FAN1, SYS_FAN1~4 Fan Connectors 44
CPU_PWR1, ATX_PWR1 Power Connectors 40
CPU Socket LGA2066 29
DIMMA1~D2 DIMM Slots 30
JAUD1 Front Audio Connector 45
JBAT1
JCI1 Chassis Intrusion Connector 45
JFP1, JFP2 Front Panel Connectors 41
JLED1 RGB LED connector 48
JTBT1
JTPM1 TPM Module Connector 43
JUSB1~2 USB 2.0 Connectors 43
Clear CMOS (Reset BIOS)
Jumper
Thunderbolt Add-on Card
Connector
47
44
JUSB3, JUSB4 USB 3.1 Gen1 Connectors 41
JUSB5 USB 3.1 Gen2 Type-C Connector 42
M2_1~2 M.2 Slots (Key M) 37
PCI_E1~6 PCIe Expansion Slots 33
POWER1, RESET1 Power Button, Reset Button 47
SATA1~8 SATA 6Gb/s Connectors 38
U2_1 U.2 Connector 36
VRAID1 Virtual RAID on CPU Connector 40
Overview of Components
28
CPU Socket
Introduction to the LGA 2066 CPU
The surface of the LGA2066 CPU has
four alignment keys and a yellow triangle
to assist in correctly lining up the CPU
for motherboard placement. The yellow
triangle is the Pin 1 indicator.
Important
y
Always unplug the power cord from the power outlet before installing or removing
the CPU.
y
Please retain the CPU protective cap after installing the processor. MSI will deal with
Return Merchandise Authorization (RMA) requests if only the motherboard comes with
the protective cap on the CPU socket.
y
When installing a CPU, always remember to install a CPU heatsink. A CPU heatsink
is necessary to prevent overheating and maintain system stability.
y
Confirm that the CPU heatsink has formed a tight seal with the CPU before booting
your system.
y
Overheating can seriously damage the CPU and motherboard. Always make sure
the cooling fans work properly to protect the CPU from overheating. Be sure to apply
an even layer of thermal paste (or thermal tape) between the CPU and the heatsink to
enhance heat dissipation.
y
Whenever the CPU is not installed, always protect the CPU socket pins by covering
the socket with the plastic cap.
y
If you purchased a separate CPU and heatsink/ cooler, Please refer to the
documentation in the heatsink/ cooler package for more details about installation.
y
This motherboard is designed to support overclocking. Before attempting to
overclock, please make sure that all other system components can tolerate
overclocking. Any attempt to operate beyond product specifications is not
recommended. MSI
operation beyond product specifications.
®
does not guarantee the damages or risks caused by inadequate
Overview of Components
29
DIMM Slots
S/K LED : S/K LED indicates that
the installed CPU supports either
4-channels or 2-channels memory
architecture.
Red = 8 DIMMs support
(4-channels architecture CPU)
White = 4 DIMMs support
(2-channels architecture CPU)
B1B2A1A2 C2C1D2D1
BAT1
Memory module installation recommendation (4-Channels architecture CPU )
B1 B2 A1 A2 Intel Core X-series CPU C2 C1 D2 D1
1 DIMM
2 DIMMs
3 DIMMs
4 DIMMs
5 DIMMs
6 DIMMs
7 DIMMs
8 DIMMs
Supports 4-channels
memory architecture
Overview of Components
30
DIMMC1
DIMMA1
DIMMC1
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