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ATX motherboard with grey steel armour and silver heatsinks

ASRock

ASRock Z390 STEEL LEGEND Intel motherboard

SKU CH-PQ4X-423S2

ATX board for 8th and 9th Gen Intel Core CPUs on LGA 1151 with DDR4 up to 4266 MT/s, dual x16 PCIe 3.0 slots, two Ultra M.2 sockets, six SATA 6.0 Gb/s ports and Realtek ALC1200 7.1 audio

  • CPU Socket TypeLGA 1151 (300 Series)
  • CPU TypeSupports 9th and 8th Gen Intel Core Processors (Socket 1151)
  • Supported CPU TechnologiesTurbo Boost Technology 2.0
  • ChipsetIntel Z390
  • Onboard Video ChipsetSupports Intel UHD Graphics Built-in Visuals: Intel Quick Sy
  • Number of Memory Slots4x288pin (DDR4)
  • Supports 9th and 8th Gen Intel Core processors via LGA 1151 socket
  • Dual-channel DDR4 memory up to 128 GB across four 288-pin slots
  • Two PCI Express 3.0 x16 slots plus three x1 slots for expansion cards
  • Two Ultra M.2 sockets with PCI Express Gen3 x4 and SATA 6.0 Gb/s support
  • Realtek ALC1200 audio codec delivering 7.1-channel sound

Z390 chipset for 8th and 9th Gen Intel Core

The ASRock Z390 STEEL LEGEND is an ATX motherboard built around the Intel Z390 chipset. It accepts 8th and 9th Generation Intel Core processors in the LGA 1151 socket. The board is not backward compatible with earlier LGA 1151 CPUs. It targets builders who need a full-size platform for these specific processor generations.

DDR4 memory limits and dual-channel operation

Four 288-pin slots support dual-channel DDR4 up to 128 GB total capacity. Validated speeds range from 2133 MT/s to 4266+(OC) MT/s including 2400, 2666, 2933, 3200, 3600, 3733, 3800, 3866, 4000 and 4133 MT/s. Only non-ECC un-buffered modules are supported. The operating system may reserve memory under 32-bit Windows.

PCIe 3.0 x4 M.2 slot for NVMe or SATA drives

The primary Ultra M.2 socket (M2_1) accepts M-key modules in 2230, 2242, 2260, 2280 and 22110 lengths. It runs at PCIe 3.0 x4 (32 Gb/s) for NVMe SSDs or at SATA 6.0 Gb/s for SATA M.2 drives. Installing a SATA-type M.2 device in M2_1 disables the SATA3_5 connector. This slot determines whether a high-speed NVMe boot drive can be used.

Highlights

  • Supports 9th and 8th Gen Intel Core processors via LGA 1151 socket
  • Dual-channel DDR4 memory up to 128 GB across four 288-pin slots
  • Two PCI Express 3.0 x16 slots plus three x1 slots for expansion cards
  • Two Ultra M.2 sockets with PCI Express Gen3 x4 and SATA 6.0 Gb/s support
  • Realtek ALC1200 audio codec delivering 7.1-channel sound

Specifications

BrandASRock
ModelZ390 STEEL LEGEND
CPU Socket TypeLGA 1151 (300 Series)
CPU TypeSupports 9th and 8th Gen Intel Core Processors (Socket 1151)
* Not backward compatible with older generation of LGA 1151 CPUs
Supported CPU TechnologiesTurbo Boost Technology 2.0
ChipsetIntel Z390
Onboard Video ChipsetSupports Intel UHD Graphics Built-in Visuals: Intel Quick Sync Video with AVC, MVC (S3D) and MPEG-2 Full HW Encode1, Intel InTru 3D, Intel Clear Video HD Technology, Intel Insider, Intel UHD Graphics
DirectX 12
HWA Encode/Decode: AVC/H.264, HEVC/H.265 8-bit, HEVC/H.265 10-bit, VP8, VP9 8-bit, VP9 10-bit (Decode only), MPEG2, MJPEG, VC-1 (Decode only)
Dual graphics output: Support HDMI and DisplayPort 1.2 ports by independent display controllers
Supports HDMI 1.4 with max. resolution up to 4K x 2K (4096x2160) @ 30Hz
Supports DisplayPort 1.2 with max. resolution up to 4K x 2K (4096x230
Number of Memory Slots4x288pin (DDR4)
Memory StandardSupports DDR4 4266+(OC)/ 4133(OC)/ 4000(OC)/ 3866(OC)/ 3800(OC)/ 3733(OC)/ 3600(OC)/ 3200(OC)/ 2933(OC)/ 2800(OC)/ 2666/ 2400/ 2133 non-ECC, un-buffered memory
Maximum Memory Supported128GB*
* Due to the operating system limitation, the actual memory size may be less than 4GB for the reservation for system usage under Windows 32-bit OS. For Windows 64-bit OS with 64-bit CPU, there is no such limitation.
Channel SupportedDual Channel
PCI Express 3.0 x162 x PCI Express 3.0 x16 Slots (PCIE1/PCIE4: single at x16 (PCIE1); dual at x16 (PCIE1) / x4 (PCIE4))*
* Supports NVMe SSD as boot disks
PCI Express x13 x PCI Express 3.0 x1 Slots (Flexible PCIe)
Other Slots1 x M.2 Socket (Key E), supports type 2230 Wi-Fi/BT module and Intel CNVi (Integrated Wi-Fi/BT)
Serial ATA (SATA)6 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_5 will be disabled.
* If M2_2 is occupied by a SATA-type M.2 device, SATA3_1 will be disabled.
* If M2_1 is occupied by a PCIE-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 2230/2242/2260/2280 M.2 SATA3 6.0Gb/s module and M.2 PCI Express module up to Gen3 x4 (32Gb/s)**
** Supports Intel Optane Technology
** Supports NVMe SSD as boot disks
** Supports ASRock U.2 Kit
Intel Optane ReadyYes
SATA RAID0/1/5/10
Audio ChipsetRealtek ALC1200
Audio Channels7.1 Channels
LAN ChipsetIntel I219-V
Max LAN Speed1Gbps
Back I/O Ports1 x Antenna Bracket
1 x PS/2 Mouse/Keyboard Port
1 x HDMI Port
1 x DisplayPort 1.2
1 x Optical SPDIF Out Port
2 x USB 2.0 Ports (Supports ESD Protection)
1 x USB 3.2 Gen2 Type-A Port (10Gb/s) (ReDriver) (Supports ESD Protection)
1 x USB 3.2 Gen2 Type-C Port (10Gb/s) (ReDriver) (Supports ESD Protection)
2 x USB 3.2 Gen1 Ports (Intel Z390) (Supports ESD Protection)
1 x RJ-45 LAN Port with LED (ACT/LINK LED and SPEED LED)
HD Audio Jacks: Rear Speaker / Central / Bass / Line in / Front Speaker / Microphone (Gold Audio Jacks)
Onboard USB2 x USB 2.0 Headers (Support 3 USB 2.0 ports) (Supports ESD Protection)
2 x USB 3.2 Gen1 Headers (Support 4 USB 3.2 Gen1 ports) (Supports ESD Protection)
Other Connectors1 x COM Port Header
1 x SPI TPM Header
1 x Power LED and Speaker Header
2 x RGB LED Headers*
1 x Addressable LED Header**
1 x CPU Fan Connector (4-pin)***
1 x CPU/Water Pump Fan Connector (4-pin) (Smart Fan Speed Control)****
3 x Chassis/Water Pump Fan Connectors (4-pin) (Smart Fan Speed Control)*****
1 x Front Panel Audio Connector
1 x Thunderbolt AIC Connector (5-pin)
* Support in total up to 12V/3A, 36W LED Strip.
** Supports 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 w
Windows 11Supported
Form FactorATX
LED LightingRGB
Dimensions (W x L)12.0" x 9.6"
Power Pin1 x 24-pin ATX Power Connector
1 x 8-pin 12V Power Connector

Questions about this item

Will my 7th generation Intel Core processor fit the LGA 1151 socket on this board?

No, the socket is for 300-series only and supports 8th and 9th generation Core CPUs. Older 6th and 7th generation LGA 1151 processors are not electrically compatible.

Can I run four sticks of DDR4 at 3200 MT/s without manual tuning?

The board lists 3200 as an overclocked speed. Running four modules at that frequency will usually require enabling the XMP profile in the BIOS and may need voltage adjustments.

If I install a SATA M.2 drive in the second M.2 slot, which SATA port becomes unusable?

Occupying M2_2 with a SATA-type M.2 device disables the SATA3_1 connector. The remaining five SATA3 ports stay active.

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