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ATX motherboard with silver-grey steel armour, eight DDR4 slots, four full-length PCIe x16 slots

ASRock

ASRock X299 Steel Legend LGA 2066 Intel motherboard

SKU CH-66J6-7P5HY

Supports Intel Core X-Series processors on LGA 2066 with quad-channel DDR4 up to 256GB and 7.1 audio via Realtek ALC1220

  • CPU Socket TypeLGA 2066
  • CPU TypeSupports Intel Core X-Series Processor Family for the LGA 20
  • Supported CPU TechnologiesTurbo Boost Technology 3.0
  • ChipsetIntel X299
  • Onboard Video ChipsetNone
  • Number of Memory Slots8x288pin (DDR4)
  • Supports Intel Core X-Series CPUs on LGA 2066 socket
  • Quad-channel DDR4 memory up to 256 GB capacity
  • Four PCI Express 3.0 x16 slots for multi-GPU builds
  • Dual Ultra M.2 sockets with PCIe Gen3 x4 32 Gb/s speed
  • Realtek ALC1220 audio delivering 7.1 channel high-definition sound

ASRock X299 Steel Legend LGA 2066 motherboard

The ASRock X299 Steel Legend is an ATX motherboard built around the Intel X299 chipset for LGA 2066 Core X-Series processors including Cascade Lake-X and Skylake-X refresh parts. It provides eight DDR4 slots supporting quad-channel memory up to 256 GB and a wide range of overclocked speeds up to DDR4 4200+. Four PCIe 3.0 x16 slots and two Ultra M.2 sockets give extensive expansion room for graphics and storage.

Who should use this board and who should not

This board suits builders who need quad-channel memory bandwidth and up to 48 PCIe lanes from high-core-count CPUs for workstations or multi-GPU compute. It is not a fit for mainstream consumer CPUs, smaller form-factor cases, or anyone who requires integrated graphics because the chipset provides no onboard video output.

LGA 2066 socket and X299 chipset define

The LGA 2066 socket paired with the Intel X299 chipset is the single specification that decides whether this motherboard fits your build. Only Intel Core X-Series processors for this socket will work and the CPU lane count (44 or 48) directly sets the electrical wiring of the four x16 slots.

Highlights

  • Supports Intel Core X-Series CPUs on LGA 2066 socket
  • Quad-channel DDR4 memory up to 256 GB capacity
  • Four PCI Express 3.0 x16 slots for multi-GPU builds
  • Dual Ultra M.2 sockets with PCIe Gen3 x4 32 Gb/s speed
  • Realtek ALC1220 audio delivering 7.1 channel high-definition sound

Specifications

BrandASRock
ModelX299 STEEL LEGEND
CPU Socket TypeLGA 2066
CPU TypeSupports Intel Core X-Series Processor Family for the LGA 2066 Socket (Cascade Lake-X, Skylake X Refresh and Skylake X)
Supported CPU TechnologiesTurbo Boost Technology 3.0
ChipsetIntel X299
Onboard Video ChipsetNone
Number of Memory Slots8x288pin (DDR4)
Memory StandardSupports 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
* The maximum memory frequency supported may vary by processor type.
Maximum Memory Supported256GB
Channel SupportedQuad Channel
PCI Express 3.0 x164 x PCI Express 3.0 x16 Slots*
* 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.
PCI Express x11 x PCI Express 3.0 x1 Slot
Other Slots1 x M.2 Socket (Key E), supports type 2230 WiFi/BT module
15µ Gold Contact in VGA PCIe Slot (PCIE1 and PCIE3)
Serial ATA (SATA)8 x SATA3 6.0Gb/s Connectors, support RAID, NCQ, AHCI and Hot Plug*
* 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.
M.21 x Ultra M.2 Socket (M2_1), supports M Key type 2230/2242/2260/2280/22110 M.2 SATA3 6.0Gb/s module and M.2 PCI Express module up to Gen3 x4 (32Gb/s)**
1 x Ultra M.2 Socket (M2_2), supports M Key type 2260/2280 M.2 SATA3 6.0Gb/s module and M.2 PCI Express module up to Gen3 x4 (32Gb/s)**
** Supports Intel Optane Technology
** Supports PCIe RAID
** Supports NVMe SSD as boot disks
Intel Optane ReadyYes
SATA RAIDRAID 0, RAID 1, RAID 5, RAID 10, Intel Rapid Storage Technology 17 and Intel Smart Response Technology
Audio ChipsetRealtek ALC1220
Audio Channels7.1 Channels
LAN ChipsetIntel I219-V
Second LAN ChipsetIntel I211-AT
Max LAN Speed2 x 1Gbps
Back I/O Ports1 x PS/2 Mouse/Keyboard Port
1 x Optical SPDIF Out Port
4 x USB 2.0 Ports (Supports ESD Protection)
1 x USB 3.2 Gen2x2 Type-C Port (20Gb/s) (ASMedia ASM3242) (Supports ESD Protection)
3 x USB 3.2 Gen1 Ports (Supports ESD Protection)
2 x RJ-45 LAN Ports with LED (ACT/LINK LED and SPEED LED)
1 x Clear CMOS Button
HD Audio Jacks: Rear Speaker / Central / Bass / Line in / Front Speaker / Microphone (Gold Audio Jacks)
Onboard USB2 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)
Other Connectors1 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 Front Panel Audio Connector (15µ Gold Audio Connector)
1 x Thunderbolt AIC Connector (5-pin)******
* 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 powe
Form FactorATX
LED LightingRGB
Dimensions (W x L)12.0" x 9.6"
Power Pin1 x 24-pin ATX Power Connector (Hi-Density Power Connector)
2 x 8-pin 12V Power Connectors (Hi-Density Power Connector)
FeaturesUnique Feature:
ASRock USB 3.2 Gen2
- ASRock Type C USB 3.2 Gen2x2 Port (20Gb/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
BIOS:
- 128MB AMI UEFI Legal BIOS with multilingual GUI support
- A
Package ContentsAccessories:
- Quick Installation Guide, Support CD, I/O Shield
- 4 x SATA Data Cables
- 1 x ASRock SLI_HB_Bridge_2S Card
- 3 x Screws for M.2 Sockets
- 2 x Standoffs for M.2 Sockets

Questions about this item

Will an Intel Core X-Series processor with 44 lanes run all four x16 slots at full speed?

With a 44-lane CPU the board routes the four x16 slots as x16, x4, x16 and x8, so only the first and third operate at full x16 bandwidth.

What is the maximum DDR4 capacity this board can address?

The board supports up to 256 GB of non-ECC unbuffered DDR4 across its eight 288-pin slots in quad-channel mode.

Can I use a SATA M.2 drive in the second M.2 socket without losing any SATA ports?

If a SATA-type M.2 drive occupies the M2_2 socket, SATA3_0 is disabled, so one of the eight SATA3 connectors becomes unavailable.

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