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
    CPU - AMD Socket TR4 for AMD Ryzen Threadripper processors
    Chipset - AMD X399
    Memory - 8 x DIMM, max 128 GB, DDR4 3200 (O.C), 3000 (O.C), 2800 (O.C.), 2666, 2400, 2133 MHz, non-ECC, un-buffered memory
    - Quad-channel memory architecture
    Expansion Slots - 4 x PCIe 3.0 x16 (single @ x16, dual @ x16/x16, triple @ x16/x16/x8 mode)
    - 1 x PCIe 2.0 x4
    - 1 x PCIe 2.0 x1
    Multi-GPU Support - Supports NVIDIA 3-Way/2-Way/Quad-GPU SLI Technology
    - Supports AMD 3-Way/2-Way/Quad-GPU CrossFireX Technology
    Audio - Realtek S1220A 8-channel high definition audio codec featuring Crystal Sound 3
    - 120 dB SNR stereo playback output (Line-out @ back) & 113 dB SNR input (Line-in) support
    - Supports up to 32-Bit/192 kHz playback
    - DTS Headphone:X
    - DTS Connect
    - Supports jack-detection, multi-streaming, and front panel jack-retasking (MIC)
    Back Panel I/O Ports - 1 x BIOS Flashback button
    - 1 x Optical S/PDIF out
    - 1 x Intel LAN (RJ45) port
    - 1 x USB 3.1 Type-A port
    - 1 x USB 3.1 Type-C port
    - 8 x USB 3.0 ports
    - 5 x Audio Jacks (Line-in, Front Speaker-out, Mic-in, Center/Subwoofer, Rear Speaker-out)
    Internal I/O Connectors - 1 x USB 3.1 front panel connector
    - 2 x USB 3.0 connectors support an additional 4 USB ports (19-pin)
    - 2 x USB 2.0 connectors support an additional 4 USB ports
    - 1 x M.2_1 Socket 3 with M key, type 2242/2260/2280 storage devices (support both SATA & PCIe 3.0 x 4 modes)
    - 1 x M.2_2 Socket 3 with vertical M Key, type 2242/2260/2280/22110 storage devices (supports both SATA & PCIe 3.0 x 4 modes)
    - 1 x U.2 port
    - 6 x SATA III 6 Gb/s connectors
    - 1 x 4-pin W_PUMP+ connector
    - 1 x 4-pin AIO_PUMP fan connector
    - 1 x 4-pin CPU Fan connector
    - 1 x 4-pin CPU_OPT fan connector
    - 1 x 3-pin Cover fan (COV_FAN) connector
    - 3 x 4-pin Chassis fan connectors
    - 1 x 4-pin M.2 fan connector
    - 1 x 5-pin EXT_FAN (Extension Fan) connector
    - 1 x 2-pin Thermal sensor header
    - 1 x 24-pin EATX Power connector
    - 1 x 8-pin EATX 12 V Power connector
    - 1 x 4-pin EATX 12 V Power connector
    - 2 x RGB header
    - 1 x Front panel audio connector (AAFP)
    - 1 x System panel connector
    - 1 x Q_Code
    - 1 x Clear CMOS header
    - 1 x Power-on button
    BIOS - 128 Mb Flash ROM, UEFI AMI BIOS, PnP, WfM2.0, SM BIOS 3.0, ACPI 6.1, Multi-language BIOS, ASUS EZ Flash 3, CrashFree BIOS 3, F11 EZ Tuning Wizard, F6 Qfan Control, F3 My Favorites, Last Modified log, F12 PrintScreen and ASUS DRAM SPD (Serial Presence Detect) memory information
    Manageability - WfM 2.0, DMI 3.0, WOL by PME, PXE
    Operating System Support - Windows 10 (64-bit)
    Form Factor - Extended ATX (EATX) Form Factor
    - 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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