c0l_logo_asrock
c0_ASRock B450M Steel Legend Motherboard

ASRock B450M Steel Legend Motherboard

Powered by AMD B450 chipset, this motherboard flawlessly supports up to 3nd generation AMD Ryzen processors of up to 16 cores. This micro ATX board looks great, featuring a camouflage-themed PCB and aggressive-looking heatsinks. Its onboard LED lighting features full spectrum of RGB colors with various effects, and can synchronize with other devices that support ASRock Polychrome. With a micro ATX form factor, this B450M Steel Legend has quad DIMM slots supporting DDR4 3533+ (OC), two PCI-E x16 slots ready for AMD Quad CrossFireX, two M.2 slots, and two USB 3.1 Gen2 ports (rear Type-A + Type-C), so you have all the essentials needed to build your new powerhouse. Moreover, this board is constructed to be tough with Super Alloy components, Full Spike Protection, and a PCI-E x16 slot covered by steel plate for better strength and less EMI.

If you're looking for a solid, budget-friendly yet feature-rich foundation for your dream system, look no further than ASRock B450M Steel Legend.

  • AMD AM4 Socket
  • Supports DDR4 3533+ (OC)
  • 1 PCIe 3.0 x16, 1 PCIe 2.0 x16, 1 PCIe 2.0 x1
  • AMD Quad CrossFireX
  • Graphics Output: DisplayPort, HDMI
  • 7.1 CH HD Audio (Realtek ALC892 Audio Codec)
  • 4 SATA3, 1 Ultra M.2 (PCIe Gen3 x4), 1 M.2 (SATA3)
  • 2 USB 3.1 Gen2 (Rear Type-A+C)
  • 6 USB 3.1 Gen1 (2 Front, 4 Rear)
  • Realtek Gigabit LAN
c1_slots & connectors
 1_Steel Legend series

Steel Legend represents the philosophical state of rock-solid durability and irresistible aesthetics. Built around most demanding specs and features, the Steel Legend series aims at daily users and mainstream enthusiasts! Providing a strong array of materials/components to ensure a stable and reliable performance. A motherboard that fulfills every task—with style!

 2_Polychrome RGB
Rule Your Own Lighting Way - Polychrome RGB

ASRock motherboards deliver stunning performance and superior aesthetics to rule your own colorful lighting way! ASRock offers a very comprehensive control to perform the built-in RGB LEDs or the connected LED strips, CPU fans, coolers, chassis and any RGB devices smoothly. Devices can be synchronized across the Polychrome RGB Sync-certified accessories as well.

* The addressable RGB LED header supports WS2812B addressable RGB LED strip (5V/Data/GND), with a maximum power rating of 3A (5V), a max of 80 LEDs and length within 2 meters.

* The RGB LED header supports standard 5050 RGB LED strip (12V/G/R/B), with a maximum power rating of 3A (12V) and length within 2 meters.

201_Polychrome RGB
 3_Dual M.2 for SSD
Dual M.2 for SSD

Two of the world’s fastest M.2 slots. One delivers up to PCIe Gen3 x4 32Gb/s transfer speed, the other one supports SATA3 6Gb/s mode.

* Please refer to the product specification page for more detail.

4_Dual USB 3.1 Gen2
Dual USB 3.1 Gen2 (Type-A + Type-C)

This motherboard has a pair of onboard Type-A and Type-C USB 3.1 Gen2 ports built on the rear I/O for supporting next generation USB 3.1 Gen2 devices and to deliver up to 10 Gbps data transfer rates.

401_Dual USB 3.1 Gen2
 5_2oz Copper
2oz Copper

It comes with 2 ounces copper inner layers, using only carefully selected copper materials for PCB layers, delivering lower temperature and higher energy efficiency for overclocking.

6_Premium 60A Power Choke
Premium 60A Power Choke

ASRock’s premium 60A power chokes effectively make the saturation current up to three times better, thus providing enhanced and improved Vcore voltage to the motherboard.

 7_PCI-E Steel Slot
PCI-E Steel Slot

The advanced PCI-E Steel Slot packed with solid cover that prevents any signal interference with graphics cards. It also allows the heavy graphics cards to be well-installed in the PCI-E slot safely.

8_Super Alloy
801_XXL Aluminum Alloy Heatsink

XXL Aluminum Alloy Heatsink

Extra large aluminum alloy heat sinks that effectively take away heat from the MOSFET and chipset so that your whole system may perform more stable.

802_Premium 60A Power Choke

Premium 60A Power Choke

Compared to traditional chokes, ASRock’s premium 60A power chokes effectively make the saturation current up to three times better, thus providing enhanced and improved Vcore voltage to the motherboard.

803_Nichicon 12K Black Caps

Nichicon 12K Black Caps

Supreme 12K black capacitors with lifespans of at least 12,000 hours. Compared to other counterparts on high-end motherboards that merely have lifespans of around 10,000 hours, ASRock applied Nichicon 12K Black Caps that offer 20% longer lifespans and provide more stability and reliability.

804_IO Armor

I/O Armor

A new designed protective cover for all of the crucial parts near the motherboard's rear I/O, so that they won't easily be damaged by static electricity.

805_Sapphire Black PCB

Sapphire Black PCB

Pure black PCB appearance. The new Sapphire Black PCB represents rock-solid quality and gives the motherboard a more mysterious touch.

806_High Density Glass Fabric PCB

High Density Glass Fabric PCB

High Density Glass Fabric PCB design that reduces the gaps between the PCB layers to protect the motherboard against electrical shorts caused by humidity.

807_2oz Copper PCB

2oz Copper PCB

Using only carefully selected copper materials for PCB layers, 2oz Copper PCB delivers lower temperature and higher energy efficiency for overclocking.

9_Full Spike Protection

Full Spike Protection

Some sensitive digital components on the motherboard are vulnerable to power surges, the excessive current may cause your system to malfunction immediately. ASRock Full Spike Protection includes various technologies to prevent your motherboard’s components from being damaged by these unexpected voltage spikes.

10_Live Update & APP Shop

Live Update & APP Shop

ASRock Live Update & APP Shop is designed for your convenience. We provide various apps and support software for users to download. You can also easily optimize your system and keep your motherboard up to date with ASRock Live Update & APP Shop.

Learn more about ASRock B450M Steel Legend

Model
Brand
ASRock
Model
B450M Steel Legend
Supported CPU
CPU Socket Type
AM4
CPU Type
Ryzen Series
Chipsets
Chipset
AMD Promontory B450
Memory
Number of Memory Slots
4x288pin (DDR4)
Memory Standard
AMD Ryzen series CPUs (Matisse) support DDR4 3200/ 2933/ 2667/ 2400/ 2133 ECC & non-ECC, un-buffered memory*AMD Ryzen series CPUs (Pinnacle Ridge) support DDR4 3533+(OC)/ 3200(OC)/ 2933(OC)/ 2667/2400/2133 ECC & non-ECC, un-buffered memory*AMD Ryzen series CPUs (Picasso) support DDR4 2933/ 2667/ 2400/ 2133 non-ECC, un-buffered memory*AMD Ryzen series CPUs (Summit Ridge) support DDR4 3466+(OC)/ 3200(OC)/ 2933(OC)/ 2667/2400/2133 ECC & non-ECC, un-buffered memory*AMD Ryzen series CPUs (Raven Ridge) support DDR4 3466+(OC)/ 3200(OC)/ 2933/ 2667/ 2400/ 2133 non-ECC, un-buffered memory** For Ryzen Series CPUs (Picasso and Raven Ridge), ECC is only supported with PRO CPUs.
Maximum Memory Supported
64GB** 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 Supported
Dual Channel
Expansion Slots
PCI Express 3.0 x16
AMD Ryzen series CPUs (Matisse, Summit Ridge and Pinnacle Ridge)- 1 x PCI Express 3.0 x16 Slot (PCIE2: x16 mode)*AMD Ryzen series CPUs (Picasso, Raven Ridge)- 1 x PCI Express 3.0 x16 Slot (PCIE2: x8 mode) (If you use Athlon 2xxGE series APU, PCIE2 slot will run at x4 mode.)AMD Athlon series CPUs- 1 x PCI Express 3.0 x16 Slot (PCIE2: x4 mode)**Supports NVMe SSD as boot disks
PCI Express 2.0 x16
AMD Ryzen series CPUs (Matisse, Summit Ridge and Pinnacle Ridge)- 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode)AMD Ryzen series CPUs (Picasso, Raven Ridge)- 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode)AMD Athlon series CPUs- 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode)*Supports NVMe SSD as boot disks
PCI Express x1
1 x PCI Express 2.0 x1 Slot
Storage Devices
SATA 6Gb/s
4 x SATA3 6.0Gb/s Connectors, support RAID, NCQ, AHCI and Hot Plug** M2_2 and SATA3_3 share lanes. If either one of them is in use, the other one will be disabled.
M.2
1 x Ultra M.2 Socket (M2_1), supports M Key type 2242/2260/2280 M.2 PCI Express module up to Gen3 x4 (32Gb/s) (with Matisse, Picasso, Summit Ridge, Raven Ridge and Pinnacle Ridge) or Gen3 x2 (16Gb/s) (with Athlon series APU and Raven Ridge 2)**1 x M.2 Socket (M2_2), supports M Key type 2230/2242/2260/2280 M.2 SATA3 6.0Gb/s module** Supports NVMe SSD as boot disks** Supports ASRock U.2 Kit
SATA RAID
0/1/10
Onboard Video
Onboard Video Chipset
Integrated AMD Radeon Vega Series Graphics in Ryzen Series APU*DirectX 12, Pixel Shader 5.0Shared memory default 2GB. Max Shared memory supports up to 16GB.**Dual graphics output: Support HDMI and DisplayPort 1.2 ports by independent display controllersSupports HDMI 1.4 with max. resolution up to 4K x 2K (4096x2160) @ 24 Hz / (3840x2160) @ 30 HzSupports DisplayPort 1.2 with max. resolution up to 4K x 2K (4096x2160) @ 60 HzSupports Auto Lip Sync, Deep Color (12bpc), xvYCC and HBR (High Bit Rate Audio) with HDMI 1.4 Port (Compliant HDMI monitor is required)Supports HDCP 1.4 with HDMI 1.4 and DisplayPort 1.2 PortsSupports 4K Ultra HD (UHD) playback with HDMI 1.4 and DisplayPort 1.2 Ports* Actual support may vary by CPU** The Max shared memory 16GB requires 32GB system memory installed.
Onboard Audio
Audio Chipset
Realtek ALC892/897 Audio Codec
Audio Channels
7.1 CH HD Audio with Content Protection Supports Surge Protection
Onboard LAN
LAN Chipset
Realtek RTL8111H
Max LAN Speed
10/100/1000Mbps
Rear Panel Ports
Back I/O Ports
1 x PS/2 Mouse/Keyboard Port1 x HDMI Port1 x DisplayPort 1.21 x Optical SPDIF Out Port2 x USB 2.0 Ports (Supports ESD Protection)1 x USB 3.2 Gen2 Type-A Port (10Gb/s) (Supports ESD Protection)1 x USB 3.2 Gen2 Type-C Port (10Gb/s) (Supports ESD Protection)4 x USB 3.2 Gen1 Ports (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)
Internal I/O Connectors
Onboard USB
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)
Other Connectors
1 x COM Port Header1 x TPM Header1 x Chassis Intrusion Header1 x Power LED and Speaker Header1 x RGB LED Header*1 x Addressable LED Header**1 x AMD Fan 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* Supports in total up to 12V/3A, 36W LED Strip.** Supports in total up to 5V/3A, 15W LED Strip.*** The AMD Fan LED Header supports LED strips of maximum load of 3A (36W) and length up to 2.5M.**** 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/WP, CHA_FAN2/WP and CHA_FAN3/WP can auto detect if 3-pin or 4-pin fan is in use.
Physical Spec
Form Factor
Micro ATX
LED Lighting
RGB
Dimensions (W x L)
9.6" x 9.6"
Power Pin
1 x 24-pin ATX Power Connector1 x 8-pin 12V Power Connector
Windows 11 Compatibility
Windows 11
Supported
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