ASUS Prime X399-A is the EATX motherboard that's been expertly engineered for professional content creators and power users who work hard by day and play harder by night. This powerful, innovative board puts a friendly face on advanced enthusiast controls, enabling you to maximize performance, cooling and personalization with ease. So, if you live to create, explore, and to push the boundaries, look no further than the Prime X399-A.
Ready for 2nd Gen AMD Ryzen Threadripper
The Prime X399-A Cooling Kit contains an SOC heatsink and a fan bracket, designed to cool vital motherboard power delivery areas to enhance the overclocking potential of 2nd Gen Threadripper WX Series Processors.
One-click overclock and cooling, done!
One click takes care of all that complex tuning. ASUS 5-Way Optimization makes your PC smart. It dynamically optimizes essential aspects of the system, providing overclocking and cooling profiles that are tailored for your rig.
An automated tuning utility that optimizes overclocking and cooling profiles for your unique system configuration.
Fans stay whisper-quiet for everyday computing, and deliver optimal airflow when the system is crunching through CPU or GPU-intensive tasks.
All-new stress test that allows users to optimize and overclock for CPU or memory-centric workloads.
Unleash your PC's full performance with the ASUS AI Suite 3 utility. A TurboV Processing Unit (TPU) is the intelligence behind our automated system-tuning utility, offering the ability to fine-tune voltages, monitor system stats, and adjust overclock parameters for optimal performance.
With the Energy Processing Unit (EPU) you'll enjoy system-wide power savings. The EPU automatically optimizes power consumption and maximizes savings with Away mode.
With Prime X399-A you have comprehensive control over fans, water pumps and even all-in-one (AIO) coolers, via either Fan Expert 4 or our award-winning UEFI. Whether you're cooling with air or water, Auto-Tuning mode intelligently configures all parameters with a single click. There's also an Extreme Quiet mode, which reduces all fan speeds to below the default minimum — keeping your system whisper-quiet when performing light tasks.
Digi+ delivers real-time control over voltage droop, switching frequency and power -efficiency settings, allowing you to fine-tune CPU voltage regulation for ultimate stability and performance.
Whether you're a professional designer or hardcore gamer, you'll feel the benefit of the ASUS-exclusive Turbo App every day. This intuitive tool allows you to define CPU overclocking, apply fan profiles, prioritize network data and optimize audio settings at app level, meaning your Prime X399-A system is perfectly optimized for what you're doing.
Cooler by design
Prime X399-A features the most comprehensive cooling controls ever, configurable via Fan Xpert 4 or the UEFI BIOS:
Each header can be set to monitor and react to three thermal sensors, and via Fan Xpert 4 you can even assign a sensor to monitor the temperature of supported ASUS graphics cards, for optimal cooling during GPU or CPU-intensive workloads.
A dedicated header that supplies over 3A for high-performance PWM or DC water pumps, plus a second dedicated header for AIOs.
A built-in fan attached to the main heatsink array that helps cool the CPU VRM.
Every onboard header supports auto-detection of PWM or DC fans.
Includes three additional DC or PWM fan headers, plus three thermal-probe headers.
A dedicated integrated circuit that protects each fan header from over-temperature and over-current.
Media-acclaimed UEFI BIOS
The smoothest, slickest mouse-controlled graphical BIOS has been improved to make it even more appealing. Whether you're a PC novice or a seasoned overclocker, the EZ and Advanced Modes help you find your way, quickly and easily.
EZ Tuning Wizard Quickly apply a CPU overclock to improve system performance
My Favorites Quickly discover tuning options and add preferred tools to the list.
Intuitive graphical fan control: Fine-tune individual fans simply by dragging a curve with the mouse.
EZ XMP: Improve your DRAM performance with a click.
SATA Information: Displays SATA port details so you can easily recognize drives.
Fast Clock Adjustment: Use mouse controls to change the time and date.
GPU POST: Provides recommendations for multi-VGA configurations and detailed information for select ASUS graphics cards.
Secure Erase: Restores your SSDs to factory-fresh condition.
Last Modified Log: Track last change and save preferred profiles onto a USB drive.
SATA Port Renaming: Rename SATA ports for easy identification.
Make your memory go faster
Prime X399-A is engineered to support quad-channel memory kits rated up to a staggering DDR4 3600MHz, allowing you to get the best performance from the X399 platform. We've worked with all major DDR4 memory vendors to help ensure compatibility, so you're assured the best compatibility.
OC Design – ASUS Pro Clock Technology
A dedicated base-clock generator that extends CPU and memory overclocking margins. This custom solution works in tandem with the TPU to enhance voltage and base-clock overclocking control, providing the flexibility to extract every ounce of performance from Ryzen™ Threadripper™ processors.
CPU : Ryzen™ Threadripper™ 1950X | Motherboard: PRIME X399-A | DRAM: G.Skill F4-3866C18Q-16GTZ | PSU: Cooler Master-RS850-AFBA-G1 | Water-cooling : Corsair H115i
Speed up with onboard M.2 up to 32Gbps
With x4 PCI Express 3.0/2.0 bandwidth, M.2 supports up to 32Gbps data-transfer speeds. It is the perfect choice for an operating system or application drive, providing fast access to data.
Keep your SSD cooler
Prime X399-A has an ultra-efficient heatsink to reduce M.2 SSD temperatures by up to 20°C — and that means optimal storage performance and improved SSD longevity.
Join the NVMe revolution
The revolutionary specification that lets your SSDs scream at top speed. Just attach your chosen drive to with plug-and-play ease to experience data-transfer speeds of up to 32Gbps — and free up a PCIe slot for another expansion card.
USB 3.1 Gen 2 front-panel connector
Prime X399-A's front panel USB 3.1 connector is ready for next-gen PC cases and devices.
USB 3.1 Gen 2 Type-A & Type-C
Ultimate-speed 10Gbps with USB 3.1 onboard
With backward-compatible USB 3.1 Gen 2 Type-A™ and reversible USB 3.1 Gen 2 Type-C™ ports, you'll experience ultimate connection flexibility and blazing data-transfer speeds of up to 10Gbps.
More throughput, less CPU usage
Prime X399-A features the latest Intel Ethernet. Intel's LAN has the advantage of reducing CPU overhead and offering exceptionally high TCP and UDP throughput for faster, smoother data transfer.
Pumped-up throughput, 2.5x higher surge tolerance
ASUS LANGuard is hardware-level networking protection that employs signal-coupling technology and premium anti-EMI surface-mounted capacitors to ensure a more reliable connection and better throughput.
Network-optimization software for customizable packet prioritization
Turbo LAN with cFosSpeed traffic-shaping technology allows you to configure application priority via an intuitive interface, and reduces network lag.
With support for both NVIDIA® SLI™ and AMD CrossFireX™ 2/3-WAY configurations, Prime X399-A motherboard enables multi-GPU setups so you can harness the full power of the latest graphics technologies to drive games at 4K and beyond.
Protect your graphics card investment
SafeSlot* is the PCIe slot reinvented by ASUS and engineered to provide superior retention and shearing resistance. Manufactured in a single step using a new insert-molding process, SafeSlot integrates the slot with fortifying metal for an inherently stronger slot, which is then firmly anchored to the PCB through additional solder points.
Realtek codec and unique design features for pristine, powerful audio
Prime X399-A utilizes a unique audio codec designed in close collaboration with Realtek — the Realtek S1220A. It also features an unprecedented 120dB signal-to-noise ratio for the stereo line-out and a 113dB SNR for the line-in, providing pristine audio quality. Additionally, a new impedance-sensing circuit automatically adjusts gain to ensure the optimal volume range for your headphones.
DTS Headphone:XTM Surround sound, to go
Immersive 3D surround-sound technology provides incredible audio experiences.
Crystal Sound 3
Flawless audio that makes you part of the game
Reduces power-input noise to ensure consistent performance.
Separates analog/digital signal domains, significantly reducing multi-lateral interference.
Ensures minimal crosstalk between audio paths.
Capable of driving high-impedance headphones, without rolling-off high or low frequencies.
Reduces start-up popping noise to all audio outputs.
Premium parts provide an immersive sound signature, with exceptional fidelity.
Outshine your competition
A well-tuned enthusiast system deserves a matching aesthetic. ASUS Aura offers full RGB lighting control with a variety of functional presets for the built-in RGB LEDs as well as strips connected to the onboard RGB header.* And it can all be synced with an ever-growing portfolio of Aura-capable ASUS hardware.
* The Aura RGB-strip header supports standard 5050 RGB LED strips with a maximum power rating of 2A (12V). For maximum brightness, strip length should not exceed 2m.
**One extension cable is included. LED Strips and Aura-compatible devices are sold separately.
Exclusive 3D mount for easy installation
Make it your own
Dedicated 3D mounts on the motherboard makes fitting 3D-printed parts easy. Using the same screws as M.2 drives and standard motherboard mounting holes, you can easily add nameplates and cable covers.
As system parts are visible in custom PC builds, make yours stand out from the competition with 3D-printed accessories.
Graphics card holder Prevent sag by providing support for heavy graphics cards.
2-Way SLI HB Bridge cover Clip the cover onto the SLI HB Bridge to add style to your build. Multiple form factors — EATX, ATX and mATX — are available.
Fan grill Make your cooling a little cooler.
Cable combs Keep cables organized with the multi-connector design. 3D design files are available for 24-pin, 8-pin, 8 + 6-pin, 6-pin and 4-pin PSU connectors.
Guide to start 3D printing
Print Use your own printer, or visit a local vendor or ASUS store with Shapeways.
Ready for AMD SocketTR4 Ryzen Threadripper The ASUS Prime X399-A motherboard supports the latest 2nd Gen AMD Ryzen™ Threadripper™ and AMD Ryzen™ Threadripper™ processors. Based on the innovative Zen core architecture, the high-performance Threadripper CPUs boast up to 32 cores. AMD SocketTR4 processors feature quad-channel DDR4 memory, 64 lanes of PCI Express® 3.0 and native 5Gbps USB 3.0 for superb performance.
AMD X399 chipset The AMD X399 chipset delivers outstanding overclocking capabilities for the latest AMD SocketTR4 Ryzen™ Threadripper™ processors. It's optimized for multiple GPU configurations, including NVDIA SLI™ and AMD CrossFireX™. It also provides two 10Gbps USB 3.1 ports and eight 6Gbps SATA ports for faster data retrieval.