Asrock X299 STEEL LEGEND, X299, 8xDDR4, M.2 , ATX

Supports Intel® Core™ X-Series Processor Family for the LGA 2066 Socket
11 Power Phase Design, Dr. MOS, Dual Power Connectors
XXL Aluminum Alloy Heatsink & Heatpipe Design
Supports DDR4 4200+(OC)
4 PCIe 3.0 x16, 1 PCIe 3.0 x1, 1 M.2 Key-E for WiFi
NVIDIA® NVLINK™, 3-Way SLI™, AMD 3-Way CrossFireX™
7.1 CH HD Audio (Realtek ALC1220 Audio Codec), Supports Purity Sound™ 4
8 SATA3, 2 Ultra M.2 (PCIe Gen3 x4 & SATA3)
1 USB 3.2 Gen2 x2 Type-C (20Gb/s)
6 USB 3.2 Gen1 (2 Front, 3 Rear, 1 x Front Type-C)
8 USB 2.0 (4 Front, 4 Rear)
Dual Intel® Gigabit LAN
ASRock Polychrome RGB LED

Unique Feature
ASRock USB 3.2 Gen2
- ASRock Type C USB 3.2 Gen2x2 Port (20 Gb/s)
ASRock Super Alloy
- XXL Aluminum Alloy Heatsink
- Premium 60A Power Choke
- 50A Dr.MOS
- Nichicon 12K Black Caps (100% Japan made high quality conductive polymer capacitors)
- Matte Black PCB
- High Density Glass Fabric PCB
ASRock Steel Slots
ASRock Full Coverage M.2 Heatsink
ASRock Ultra M.2 (PCIe Gen3 x4 & SATA3)
ASRock POST Status Checker (PSC)
ASRock Full Spike Protection (for all USB, Audio, LAN Ports)
ASRock Live Update & APP Shop
CPU
- Supports Intel® Core™ X-Series Processor Family for the LGA 2066 Socket (Cascade Lake-X, Skylake X Refresh and Skylake X)
- Digi Power design
- 11 Power Phase design
- Supports Intel® Turbo Boost Max Technology 3.0
Chipset
- Intel® X299
Memory
- Quad Channel DDR4 Memory Technology
- 8 x DDR4 DIMM Slots
- Supports DDR4 4200+(OC)* / 4000(OC) / 3800(OC) / 3733(OC) / 3600(OC) / 3200(OC) / 2933(OC) / 2800(OC) / 2666 / 2400 / 2133 non-ECC, un-buffered memory
- Max. capacity of system memory: 256GB
- Supports Intel® Extreme Memory Profile (XMP) 2.0
- 15µ Gold Contact in DIMM Slots

*The maximum memory frequency supported may vary by processor type.
BIOS
- 128Mb AMI UEFI Legal BIOS with multilingual GUI support
- ACPI 6.1 Compliant wake up events
- SMBIOS 3.0 Support
- CPU, DRAM, VPPM, VTTM, PCH 1.0V, VCCIO, VCCSA, Voltage Multi-adjustment
Graphics
- n/a
Audio
- 7.1 CH HD Audio with Content Protection (Realtek ALC1220 Audio Codec)
- Premium Blu-ray Audio support
- Supports Surge Protection
- Supports Purity Sound™ 4
- Nichicon Fine Gold Series Audio Caps
- 120dB SNR DAC with Differential Amplifier
- NE5532 Premium Headset Amplifier for Front Panel Audio Connector (Supports up to 600 Ohm headsets)
- Pure Power-In
- Direct Drive Technology
- PCB isolate shielding
- Impedance Sensing on Rear Out port
- Individual PCB Layers for R/L Audio Channel
- Gold Audio Jacks
- 15µ Gold Audio Connector
LAN
- Gigabit LAN 10/100/1000 Mb/s
- 1 x Giga PHY Intel® I219V, 1 x GigaLAN Intel® I211AT
- Supports Wake-On-LAN
- Supports Lightning/ESD Protection
- Supports Dual LAN with Teaming*
- Supports Energy Efficient Ethernet 802.3az
- Supports PXE

*Teaming is supported on Windows® 10 RS2, RS3 and RS4.
Slots
- 4 x PCI Express 3.0 x16 Slots*
- 1 x PCI Express 3.0 x1 Slot*
- Supports AMD 3-Way CrossFireX™ and CrossFireX™ **
- Supports NVIDIA® 3-Way SLI™ and SLI™**
- Supports NVIDIA® NVLink™ with dual NVIDIA® GeForce RTX series graphics cards**
- 1 x M.2 Socket (Key E), supports type 2230 WiFi/BT module
- 15µ Gold Contact in VGA PCIe Slot (PCIE1 and PCIE3)

*If you install CPU with 48 lanes, PCIE1/PCIE2/PCIE3/PCIE5 will run at x16/x4/x16/x8.
If you install CPU with 44 lanes, PCIE1/PCIE2/PCIE3/PCIE5 will run at x16/x4/x16/x8.
If you install CPU with 28 lanes, PCIE1/PCIE2/PCIE3/PCIE5 will run at x16/x4/x8/x0.

**3-Way CrossFireX™ and 3-Way SLI™ are only supported with CPU with 48 lanes or 44 lanes.
NVIDIA® NVLink™ Bridge does not come with the package. Please purchase it from NVIDIA® if necessary.
Storage
- 8 x SATA3 6.0 Gb/s Connectors, support RAID (RAID 0, RAID 1, RAID 5, RAID 10, Intel® Rapid Storage Technology 17 and Intel® Smart Response Technology), NCQ, AHCI and Hot Plug*
- 1 x Ultra M.2 Socket (M2_1), supports M Key type 2230/2242/2260/2280/22110 M.2 SATA3 6.0 Gb/s module and M.2 PCI Express module up to Gen3 x4 (32 Gb/s)**
- 1 x Ultra M.2 Socket (M2_2), supports M Key type 2260/2280 M.2 SATA3 6.0 Gb/s module and M.2 PCI Express module up to Gen3 x4 (32 Gb/s)**

*If M2_1 is occupied by a SATA-type M.2 device, SATA3_1 will be disabled.
If M2_2 is occupied by a SATA-type M.2 device, SATA3_0 will be disabled.

**Supports Intel® Optane™ Technology M10 Series
Supports PCIe RAID
Supports NVMe SSD as boot disks
Connector
- 1 x Virtual RAID On CPU Header
- 1 x SPI TPM Header
- 1 x Power LED and Speaker Header
- 2 x RGB LED Headers*
- 2 x Addressable LED Headers**
- 1 x CPU Fan Connector (4-pin)***
- 1 x CPU/Water Pump Fan Connector (4-pin) (Smart Fan Speed Control)****
- 5 x Chassis/Water Pump Fan Connectors (4-pin) (Smart Fan Speed Control)*****
- 1 x 24 pin ATX Power Connector (Hi-Density Power Connector)
- 2 x 8 pin 12V Power Connectors (Hi-Density Power Connector)
- 1 x Front Panel Audio Connector (15µ Gold Audio Connector)
- 1 x Thunderbolt™ AIC Connector (5-pin)******
- 2 x USB 2.0 Headers (Support 4 USB 2.0 ports) (Supports ESD Protection)
- 1 x USB 3.2 Gen1 Header (Supports 2 USB 3.2 Gen1 ports) (Supports ESD Protection)
- 1 x Front Panel Type C USB 3.2 Gen1 Header (ASMedia ASM1074 Hub)

*Supports in total up to 12V/3A, 36W LED Strip

**Support in total up to 5V/3A, 15W LED Strip

***The CPU Fan Connector supports the CPU fan of maximum 1A (12W) fan power.

****The CPU/Water Pump Fan supports the water cooler fan of maximum 2A (24W) fan power.

*****The Chassis/Water Pump Fan supports the water cooler fan of maximum 2A (24W) fan power.
CPU_FAN2/WP, CHA_FAN1~5/WP can auto detect if 3-pin or 4-pin fan is in use.

******The Thunderbolt™ AIC card can be installed in the enabled PCIe slot (depending on CPU type).
Rear Panel I/O
- 2 x Antenna Ports (on I/O Panel Shield)
- 1 x PS/2 Mouse/Keyboard Port