ASUS Prime X399-A TR4 Extended ATX Motherboard

ASUS Prime X399-A TR4 Extended ATX Motherboard

ASUS Prime X399-A TR4 Extended ATX Motherboard

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Product Highlights

  • Extended ATX Form Factor
  • AMD X399 Chipset
  • TR4 Socket
  • 8 x Quad-Channel DDR4-3200 (OC)
  • 6 x SATA III, 2 x M.2, 1 x U.2
  • 4 x PCIe 3.0 x16 Slots
  • 1 x PCIe 2.0 x4 & 1 x PCIe 2.0 x1 Slots
  • Realtek S1220A 8-Channel HD Audio Codec
  • Intel I211-AT Gigabit Ethernet
  • NVIDIA SLI & AMD CrossFireX Support
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  • 1Description

Ready for AMD Ryzen Threadripper processors, the Prime X399-A TR4 Extended ATX Motherboard from ASUS allows users to enjoy the benefits of customization and tuning, with controls made easily accessible for a strong DIY PC experience. It provides users with 5-Way Optimization, 5X Protection III, AURA SYNC, native SATA III, M.2 and U.2 support, 10 Gb/s USB 3.1, the UEFI BIOS, and more. This motherboard is designed to fit in Extended ATX (EATX) sized cases, supports the TR4 socket, the AMD X399 chipset, and is compatible with Windows 10 (64-bit).

The EATX form factor of the Prime X399-A can support 128GB of DDR4 RAM, or 16GB in each of the eight 288-pin DIMM slots at memory speeds of 3200 (OC), 3000 (OC), 2800 (OC), 2666, 2400, and 2133 MHz. It also has a total of 6 x SATA III 6 Gb/s ports, 1 x M.2 Socket 3 connector that supports Type 2242/2260/2280/22110 SATA and PCIe 3.0 x4 SSDs, 1 x M.2 Socket 3 connector that supports Type 2242/2260/2280 PCIe 3.0 x4 and SATA SSDs, and 1 x U.2 port that supports NVMe PCIe 3.0 x4 storage.

There are also eight USB 3.0 Type-A ports, one USB 3.1 Type-C port, and one USB 3.1 Type-A port, all at the back panel, as well as one USB 3.1 front-panel connector, four USB 3.0 ports (mid-board), and four USB 2.0 ports (mid-board). For those looking to expand their system using PCIe, there are four PCIe 3.0 x16 slots that supports single at x16, dual at x16/x16, and triple at x16/x16/x8 modes, as well as one PCIe 2.0 x4 slot and one PCIe 2.0 x1 slot.

The Prime X399-A does not contain any support for integrated graphics, meaning that users will need to purchase a compatible dedicated GPU of their choice. Once that GPU is installed, multi-GPU output is supported, with NVIDIA 3-Way/2-Way/Quad-GPU SLI technology and AMD 3-Way/2-Way/Quad-GPU CrossFireX technology.

Using the SupremeFX S1220 8-Channel HD audio codec, the Prime X399-A delivers audio with high fidelity, which can also be output using the five integrated audio jacks or one S/PDIF output. The motherboard is also equipped with features such as Gigabit Ethernet, Fan Xpert 4, AI Suite 3, Ai Charger, SafeSlot Core, LANGuard, overvoltage protection, DIGI+ VRM, overcurrent protection, and more. This motherboard is protected by a limited 3-year warranty.

ASUS Exclusive Features


OC Design: ASUS PRO Clock Technology
Full BCLK range for increased overclocking performance
5-Way Optimization
Whole system optimization with a single click. Efficiently consolidates better CPU performance, power saving, digital power control, system cooling, and app usages.

DIGI+ Power Control
- CPU Power: Digital 8+3-phase power design
- DRAM Power: Digital 4-phase power design

- Auto Tuning

Fan Xpert 4
Turbo App

- CrashFree Bios 3
- EZ Flash 3
- EZ Tuning Wizard


3D Printing-friendly design
Turbo LAN

EZ Management

File Transfer
PC Cleaner


ASUS Q-Connector
ASUS Q-Shield

ASUS Special Features

ASUS SafeSlot
Protect your graphics card investment
ASUS 5X Protection III
ASUS SafeSlot Core
Fortified PCIe with solid soldering

Helps protect against LAN surges, lightning strikes, and static electricity discharge

ASUS Overvoltage Protection
Circuit-protecting power design

Digital power design

ASUS DRAM Overcurrent Protection
Enhanced DRAM overcurrent protection

ASUS Stainless-Steel Back I/O

Up to 3x greater corrosion resistance for greater durability
AI Suite 3
Ai Charger

ASUS Quiet Thermal Solution

ASUS MOS & M.2 heatsink design
UPC: 889349828083
In the Box
ASUS Prime X399-A TR4 Extended ATX Motherboard
  • 4 x SATA III 6 Gb/s Cables
  • SLI HB Bridge (2-Way-M)
  • M.2 Screw Package
  • M.2 Vertical Bracket
  • Q-Connector
  • ASUS Q-Shield
  • Supporting DVD
  • Limited 3-Year Warranty
  • Table of Contents
    • 1Description
    Chipset AMD X399
    CPU Socket TR4
    Back Panel I/O
    USB 1 x USB 3.1 Gen 2 Type-A
    1 x USB 3.1 Gen 2 Type-C
    8 x USB 3.1 Gen 1 Type-A
    Audio 5 x 3.5 mm
    1 x S/PDIF
    Ethernet / Controller 1 x Intel
    PS/2 Not Specified by Manufacturer
    Legacy Not Specified by Manufacturer
    Wi-Fi Antenna Not Specified by Manufacturer
    Buttons BIOS Flashback
    Memory Slots 8 x 288-Pin
    Memory Support DDR4 2133, 2400, 2666, 2800, 3000, 3200 MHz
    Maximum Capacity 128 GB
    Channel Architecture Quad Channel
    ECC Support Non-ECC Unbuffered
    Storage Expansion
    M.2 1 x M Key 2242, 2260, 2280 (PCIe 3.0 x4, SATA III)
    1 x M Key 2242, 2260, 2280, 22110 (PCIe 3.0 x4, SATA III)
    U.2 1
    RAID Support RAID 0, 1, 10
    Internal I/Ofdexcxayuctreaztxcetzbvec
    Expansion Slots 4 x PCIe 3.0 x16
    1 x PCIe 2.0 x4
    1 x PCIe 2.0 x1
    USB 2 x USB 3.1 Gen 1 Header (Supports 4 USB Type-A Ports)
    2 x USB 2.0 Header (Supports 4 USB Type-A Ports)
    Multi-GPU Support 3-Way 
    Quad-GPU AMD CrossFireX
    Air Cooling 2 x 4-Pin CPU
    1 x 3-Pin Cover
    3 x 4-Pin System
    1 x 4-Pin M.2
    1 x 5-Pin Extension
    1 x Thermal Sensor
    Liquid Cooling 2 x 4-Pin Pump
    Power Connectors 1 x 24-Pin Mainboard
    1 x 8-Pin CPU
    1 x 4-Pin CPU
    Security Not Specified by Manufacturer
    LED Header 2 x RGB
    Diagnostics 2-Digit Debug LED, Clear CMOS, Power
    Add-On Not Specified by Manufacturer
    Legacy Not Specified by Manufacturer
    ROM 128 Mb
    Front Panel I/O
    I/O Connection Headers AAFP, USB 3.1
    Audio Codec Realtek S1220A (8-Channel)
    Bluetooth Version Not Specified by Manufacturer
    Wi-Fi None
    Module Support Not Specified by Manufacturer
    Supported Operating Systems Windows 10 (64-Bit)
    Form Factor E-ATX
    Dimensions 12.0 x 10.6" / 30.5 x 26.9 cm
    Packaging Info
    Package Weight 5.65 lb
    Box Dimensions (LxWxH) 14.5 x 12.1 x 4.3"
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