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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

  • ProcessorSupports Intel Core X-Series Processor Family for the LGA 20
  • ChipsetIntel X299
  • Form factorATX
  • CPU socketLGA 2066
  • CPU technologiesTurbo Boost Technology 3.0
  • Memory slot count8 × 288pin (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.

How it compares

Measured against everything we stock in Motherboards for Intel CPUs, at today’s prices. Recalculated every night.

Price $229.99
Pricier than about 85% of the 2,965 comparable items (median $97.99).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameASRock
Model nameX299 STEEL LEGEND
Processor
ProcessorSupports Intel Core X-Series Processor Family for the LGA 2066 Socket (Cascade Lake-X, Skylake X Refresh and Skylake X)
CPU socketLGA 2066
ChipsetIntel X299
CPU technologiesTurbo Boost Technology 3.0
Memory
Memory slot count8 × 288pin (DDR4)
Supported memorySupports 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.
Max supported RAM256 GB
Memory channelsQuad Channel
Storage
M.2 slots1 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
Optane memory supportYes
SATA and RAID supportRAID 0, RAID 1, RAID 5, RAID 10, Intel Rapid Storage Technology 17 and Intel Smart Response Technology
Graphics
Onboard video chipNone
Audio & video
Audio chipRealtek ALC1220
Sound channels7.1 Channels
Connectivity
Ethernet controllerIntel I219-V
Second LAN controllerIntel I211-AT
Maximum network speed2 × 1 Gbit/s
Ports & slots
PCIe x1 slots1 x PCI Express 3.0 x1 Slot
Additional slots1 x M.2 Socket (Key E), supports type 2230 WiFi/BT module
15µ Gold Contact in VGA PCIe Slot (PCIE1 and PCIE3)
Rear panel 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 Gen2 × 2 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)
Power
Power connectors1 × 24-pin ATX Power Connector (Hi-Density Power Connector)
2 × 8-pin 12 V Power Connectors (Hi-Density Power Connector)
Size & build
Form factorATX
Width and length12.0 in × 9.6 in
In the box
In the boxAccessories:
- 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
More details
LightingRGB

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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