The Prime X299-A II caters to users with serious pursuits: Those who prefer to put their high-core-count processors to more productive use. This high-end desktop board combines cutting-edge performance with our signature features, including an enhanced VRM tailored for running the CPU performance at stock speeds, intuitive cooling control, next-gen connectivity, and extensive customisation.

Get the most out of all your cores

Intel®'s high-end desktop platform raises the stakes with updated Intel Core™ X-Series Processors that boast cores, cache, and bandwidth. The Prime X299-A II is ready for the additional processing power that plows through CPU-intensive tasks, and the extra bandwidth allows you to add more GPUs and NVMe SSDs to accelerate a wide range of work.

Robust Power Design

The LGA 2066 socket is compatible with Intel Core X-Series Processors with up to 18 cores, over 44 PCI Express® lanes, and 165-watt thermal design power (TDP). Those specs require serious power, so the Prime X299-A II is equipped with an enhanced power solution that includes 12 power stages that line up neatly along the top edge of the PCB.

Make your memory go faster

The X299 platform delivers ample bandwidth on multiple fronts. Its quad-channel memory controller supports up to 256 GB of DDR4 memory across eight slots. With optimised trace layout, the Prime X299-A II can hit memory speeds up to DDR4 4266 MHz or beyond.

Multi-GPU support

Fully loaded takes on a new meaning when you have over 44 PCI Express lanes stemming from the CPU. Those lanes can be split in an x16/x16/x8 configuration spanning the board's trio of PCIe x16 slots, allowing you to load up on GPUs to accelerate an increasingly diverse array of work.

M.2

Achieve speed with onboard M.2

Professional applications require fast solid-state storage, which is why the Prime X299-A II is equipped with three M.2 slots that are compatible with the latest NVMe SSDs. All slots support longer 110 mm drives, and they can be configured into bootable RAID arrays connected directly to the CPU via Intel VROC technology.

VROC

Upgrade your RAID

Use onboard M.2 slots and ASUS Hyper M.2 x16 Card V2* to take advantage of Intel's Virtual RAID on CPU (VROC)** by connecting the three M.2 drives in RAID configurations. With VROC, your RAID arrays are easily configured to be bootable, and traditional DMI bottlenecks are eliminated so that your storage is not held back by other traffic.

* ASUS Hyper M.2 x16 Card V2 is a separate purchase.
** Additional purchase of Intel VROC hardware key required for RAID 1, 5 or 10.

USB 3.2 Gen 2 front-panel connector

Future-proof connectivity

Plenty of USB ports are provided to support high-end rigs loaded with peripherals, including a front-panel header with faster USB 3.2 Gen 2 connectivity for compatible cases.

Intel Ethernet

More throughput, less CPU usage and great gaming experiences

The latest Intel I219-V Ethernet has the advantage of reducing CPU overhead and offering exceptionally high TCP and UDP throughput for faster, smoother data transfer.

Cool to the core

Effective cooling is extremely important, even at stock speeds. That is why the Prime X299-A II allows consolidated cooling control of the entire system, even for the most hardcore rigs. It comes equipped with onboard heatsinks, an array of fan headers, and options for water pump or AIO headers.

M.2 Heatsinks

Two M.2 slots are covered by heatsinks to combat temperature-induced throttling that can affect performance during heavy, sustained storage loads.

Backplate

A reinforced backplate improves the stability of the board, and the included thermal pad efficiently directs heat away from the VRM and other components.

Cooler by design

Prime X299-A II features the most comprehensive cooling controls ever, configurable via FanXpert 4 or the UEFI BIOS.

Tune it your way

Comprehensive controls form the foundation of the ASUS Prime series. The Prime X299-A II packs flexible tools to tune every aspect of your system to deliver the performance that you desire.

AI Overclocking

ASUS AI Overclocking makes automatic tuning faster and smarter than ever before. Available in Windows or directly through the UEFI, it profiles the CPU and cooling to predict the optimal configuration for each individual system.

5-way Optimisation

One click takes care of all that complex tuning. ASUS 5-Way Optimisation makes your PC smart. It dynamically optimises essential aspects of the system, providing overclocking and cooling profiles that are tailored for your rig.

• An automated tuning utility that optimises overclocking and cooling profiles for your unique system configuration.
• Fans stay quiet as a whisper 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 optimise and overclock for CPU or memory-centric workloads.

UEFI BIOS

The renowned UEFI BIOS provides everything you need to configure, tweak, and tune your rig. It offers intelligently simplified options for newcomers to PC DIY, as well as comprehensive features for seasoned veterans.

Little things make a big difference

We pay careful attention to all the little details that improve your overall experience, from integrating a flashing utility directly into the UEFI to simplifying firmware updates or displaying your system vital signs. Prime X299-A II provides the tools you need to personalise your build and stay on top of things.

Pre-mounted I/O Shield

Set up without slip-ups

Form meets function in the pre-mounted I/O shield that we pioneered with the ROG series. Now available on Prime X299-A II, this feature streamlines the installation process for budding builders and savvy enthusiasts alike.

FlexKey

A multi-purpose button

The FlexKey maps the rarely used Reset button on the front-panel of your chassis to a different function. Instead of leaving the button set to a dated function, you can reassign it to change performance profiles, boot directly into the UEFI, toggle Aura Sync lighting, and much more.

BIOS Flashback

Update your BIOS without CPU and DRAM

The Prime X299-A II supports USB BIOS Flashback®, which can perform low-level firmware updates using only a power supply and a USB stick with the required file.

ASUS Node

A header to keep ahead

ASUS Node is a proprietary bi-directional interface that allows ASUS motherboards to communicate with other system components, opening up a wealth of new options for system builders.?

Realtek codec and unique design features for pristine, powerful audio

Prime X299-A II utilises 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 the gain to ensure optimal volume range for your headphones.

DTS:X® Ultra adds a spatial audio feature to boost headphones and speakers for an enhanced gaming, VR, and extended reality experience. DTS:X Ultra supports sound based on channels, scenes, and objects to allow for deeper sonic immersion in enabled content. It also provides post-processing enhancements and device-level tuning for DTS® codecs.

Aura Sync

Outshine the 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 and they can all be synced with an ever-growing portfolio of Aura-capable ASUS hardware. The board has dual headers for standard 4-pin RGB strips*, plus two more for the new Addressable Gen 2 RGB strips** and devices.

* The Aura RGB-strip header supports standard 5050 RGB LED strips with a maximum power rating of 3A (12V). For maximum brightness, strip length should not exceed 3m.

** The addressable RGB header supports WS2812B addressable RGB LED strips (5V/Data/Ground), with a max power rating of 3A (5V) and a max of 60 LEDs.

Addressable Gen 2 RGB header

Prime X299-A II has an addressable Gen 2 RGB header, which is now capable of detecting the number of LEDs on second-gen addressable RGB devices, allowing the software to automatically tailor lighting effects to specific devices. The new headers also offer backward-compatibility with existing Aura RGB gear.

Armoury Crate

Armoury Crate is a new software utility designed to give you centralised control of supported products. From a single intuitive interface, Armoury Crate allows you to easily customise RGB lighting and effects for every compatible device in your arsenal. The software also provides control of settings for ASUS products, including keyboard and mouse preferences. Armoury Crate even features dedicated product registration and highlight to help you stay in touch with the ASUS community.