ASRock Intel Core-X X299 Steel Legend ATX Motherboard

QuickFind: 991334 Mfr part code: X299 STEEL LEGEND

Product Description

ASRock Intel Core-X X299 Steel Legend ATX Motherboard

Empower your Imagination

Here it is, the ASRock X299 Steel Legend, built for pure performance and sustainability and targeting most mainstream users. Featuring dual Intel Gigabit LAN, NVIDIA NVLINK, 3-way SLI and 3-way AMD CrossFireX and an XXL aluminium heatsink/heatpipe design. The X299 Steel Legend represents the rock-solid durability and irresistible aesthetics and provides a strong array of materials/components to ensure a stable and reliable performance. A motherboard that can fulfill every task - with style.


Dual M.2 for SSD

ASRock have included two of the worlds fastest M.2 slots. one interfaces via PCIe Gen3 x4 and provides ultra-fast transfer speeds of up to 32 Gb/s and the other also supports SATA3 6 GB/s both are protected by an integrated aluminum alloy cover.


Sturdy & Stable Power Delivery

Built from sturdy components and based on an 11 power phase design giving you stable voltage outputs from the VRMs and ensuring smooth power delivery to the CPU which in turn means the X299 Steel Legend offers unmatched overclocking capabilities and enhanced performance with lower temperature outputs.



Dr.MOS is the integrated power stage solution which is optimised for synchronous buck-set down voltage applications. Delivering higher current and driving up to 50A of continuous current for each phase, the benefit of this is improved thermal results and better performance.


Type-C & Type A USB Ports

The X299 Steel Legend features a plethora of USB Connections ranging from 2x USB 2.0 Headers for the front panel (capable of supporting 4 USB 2.0 ports), 1x USB 3.2 Gen1 header (supports 2x USB 3.2 Gen1 ports) and 1x Front Panel Type C USB Header directly on the board whilst the rear I/O panel hosts 4x USB 2.0 Ports, 1x USB 3.2 Gen2x2 Type-C port(20 Gb/s) and 3x USB 3.2 Gen1 Ports providing you with multiple connections to connect all of your peripherals and controllers as you deem necessary.


USB 3.2 Gen2x2 Type-C

The very latest in Type-C connections offering transfer speeds of up to 20 Gbps which is twice as fast as previous generations, giving you blazing fast data transfer and a highly sought after reversible USB Type-C port design allowing the connector to fit either way.


Front USB 3.2 Gen1 Type-C

The X299 Steel Legend by ASRock features a front USB 3.2 Gen1 Type-C header delivering up to 5 Gbps and next generation reversible USB design to the front panel of your chosen case allowing you easy access to faster transfer speeds.

Technical Specification

ASRock Intel Core-X X299 Steel Legend ATX Motherboard


Product Type Motherboard - ATX
Chipset Type Intel X299
Processor Socket LGA2066 Socket
Max Processors Qty 1

Supported RAM

Max Size 256 GB
Technology DDR4
Bus Clock 2400 MHz, 2133 MHz, 2666 MHz, 2800 MHz (O.C.), 2933 MHz (O.C.), 3200 MHz (O.C.), 3733 MHz (O.C.), 3600 MHz (O.C.), 3800 MHz (O.C.), 4000 MHz (O.C.), 4200 MHz (O.C.)
Supported RAM Integrity Check Non-ECC
Registered or Buffered Unbuffered
Features Quad channel memory architecture, Intel Extreme Memory Profiles (XMP) 2.0


Type HD Audio (8-channel)
Audio Codec Realtek ALC1220
Compliant Standards High Definition Audio, Premium Blu-ray audio support, Purity Sound 4


Network Controller Intel I219V / I211-AT
Network Interfaces 2 x Gigabit Ethernet


Included Accessories 3 x M.2 screws, ASRock SLI_HB_Bridge_2S Card, 2 x standoff for M.2 socket
Cables Included 4 x Serial ATA cable
Software Included Drivers & Utilities, ASRock A-Tuning, Antivirus (Trial version), Google Chrome Browser, Google ChromeToolbar, ASRock XFast LAN, ASRock Polychrome SYNC
Compliant Standards FCC, EuP Ready, ErP Ready
Width 30.5 cm
Depth 24.4 cm

Expansion / Connectivity

Expansion Slots 1 x CPU ¦ 8 x DIMM 288-pin ¦ 4 x PCIe 3.0 x16 (48-lane CPU (x16/x4/x16/x8 mode), 44-lane CPU (x16/x4/x16/x8 mode), 28-lane CPU (x16/x4/x8/x0 mode)) ¦ 1 x PCIe 3.0 x1 ¦ 1 x M.2 socket (Key E)
Storage Interfaces SATA-600 -connectors: 8 x 7pin Serial ATA - RAID 0 / RAID 1 / RAID 10 / RAID 5 ¦ SATA-600 / PCIe 3.0 -connectors: 2 x Ultra M.2
RAID Features Intel Smart Response Technology
Interfaces 1 x PS/2 keyboard / mouse ¦ 1 x USB-C Gen2x2 ¦ 1 x TOSLINK ¦ 4 x USB 2.0 ¦ 3 x USB 3.2 Gen 1 ¦ 2 x LAN (Gigabit Ethernet) ¦ 1 x audio line-out (rear) - mini-jack ¦ 1 x audio line-out (center/subwoofer) - mini-jack ¦ 1 x audio line-in - mini-jack ¦ 1 x audio line-out - mini-jack ¦ 1 x microphone - mini-jack
Internal Interfaces 2 x USB 3.2 Gen 1 - header ¦ 4 x USB 2.0 - header ¦ 1 x audio - header ¦ 1 x Thunderbolt - header ¦ 1 x USB-C Gen 1 - header
Power Connectors 24-pin main power connector, 2 x 8-pin ATX12V connectors


BIOS Features Multilingual BIOS, UEFI BIOS, SMBIOS 3.0 support, ACPI 6.1 support
Hardware Monitoring CPU core temperature, chassis temperature, CPU fan tachometer, chassis fan tachometer, system voltage, CPU core voltage
Sleep / Wake Up Wake on LAN (WOL)
Hardware Features NVIDIA SLI Technology Support, ASRock Instant Flash, NVIDIA 3-way SLI Technology Support, 15µ Gold Contact, Dual LAN Teaming, AMD CrossFireX technology support, AMD 3-way CrossFireX technology support, ASRock Internet Flash, Digi Power Design, ESD Protection, Gold Plated Audio Hardware, Energy Efficient Ethernet 802.3az, Preboot eXecution Environment (PXE), Clear CMOS Button, Direct Drive Technology, ASRock Full Spike Protection, ASRock APP Shop, ASRock Super Alloy, High Density Glass Fabric PCB, ASRock Full HD UEFI, ASRock My Favorites in UEFI, ASRock Easy RAID Installer, Dr.MOS MOSFET, XXL Aluminum Alloy Heatsink, Nichicon Fine Gold Series Audio Capacitors, ASRock Live Update, ASRock EZ Mode, Intel Optane Memory Ready, ASRock Ultra M.2, Nichicon 12K Black Caps, Matte Black PCB, ASRock Steel Slots, TI NE5532 Premium Headset Amplifier, Premium 60A Power Choke, 11 Phase Power Design, 120dB SNR DAC with Differential Amplifier, Pure Power-In, PCB Isolate Shielding, ASRock VR Ready, Intel VROC support, Intel Turbo Boost Max Technology 3.0, NVIDIA NVLink, ASRock POST Status Checker (PSC), ASRock Full Coverage M.2 Heatsink, ASRock USB 3.2 Gen2

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ASRock Intel Core-X X299 Steel Legend ATX Motherboard

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