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Model

B450M Pro4

B450M Steel Legend
Form Factor- Micro ATX Form Factor: 9.6-in x 9.6-in, 24.4 cm x 24.4 cm
- Solid Capacitor design
- Micro ATX Form Factor: 9.6-in x 9.6-in, 24.4 cm x 24.4 cm
Unique FeatureASRock USB 3.1 Gen2< / b>
- ASRock USB 3.1 Gen2 Type-A Port (10 Gb / s)
- ASRock USB 3.1 Gen2 Type-C Port (10 Gb / s)
ASRock Super Alloy< / b>
- Premium 42A Power Choke
- Sapphire Black PCB
- High Density Glass Fabric PCB
- 2oz Copper PCB
ASRock Ultra M.2< / b> (PCIe Gen3 x4)
ASRock Full Spike Protection< / b> (for all USB, Audio, LAN Ports)
ASRock Live Update & APP Shop< / b>
ASRock USB 3.1 Gen2< / b>
- ASRock USB 3.1 Gen2 Type-A Port (10 Gb / s)
- ASRock USB 3.1 Gen2 Type-C Port (10 Gb / s)
ASRock Super Alloy< / b>
- XXL Aluminum Alloy Heatsink
- Premium 60A Power Choke
- Nichicon 12K Black Caps (100% Japan made high quality conductive polymer capacitors)
- I / O Armor
- Sapphire Black PCB
- High Density Glass Fabric PCB
- 2oz Copper PCB
ASRock Steel Slot< / b>
ASRock Ultra M.2< / b> (PCIe Gen3 x4)
ASRock Full Spike Protection< / b> (for all USB, Audio, LAN Ports)
ASRock Live Update & APP Shop< / b>
AMD StoreMI< / b>
CPU- AMD AM4 Socket
- Digi Power design
- AMD AM4 Socket
- Digi Power design
- 6 Power Phase design
Chipset- AMD Promontory B450- AMD Promontory B450
Memory- Dual Channel DDR4 Memory Technology
- 4 x DDR4 DIMM Slots
- 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 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 3200+(OC)/2933(OC)/2667/2400/2133 ECC & non-ECC, un-buffered memory*
- AMD Ryzen series CPUs (Raven Ridge) support DDR4 3200+(OC)/2933/2667/2400/2133 non-ECC, un-buffered memory*
- Max. capacity of system memory: 64GB**
- 15μ Gold Contact in DIMM Slots

*For Ryzen Series CPUs (Picasso and Raven Ridge), ECC is only supported with PRO CPUs.
Please refer to below table for AMD non-XMP memory frequency support.

Ryzen Series CPUs (Matisse):


Ryzen Series CPUs (Pinnacle Ridge):


Ryzen Series CPUs (Picasso):


Ryzen Series CPUs (Summit Ridge):


Ryzen Series CPUs (Raven Ridge):


SR: Single rank DIMM, 1Rx4 or 1Rx8 on DIMM module label
DR: Dual rank DIMM, 2Rx4 or 2Rx8 on DIMM module label

**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.
- Dual Channel DDR4 Memory Technology
- 4 x DDR4 DIMM Slots
- 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*
- Max. capacity of system memory: 64GB**
- 15μ Gold Contact in DIMM Slots

*For Ryzen Series CPUs (Picasso and Raven Ridge), ECC is only supported with PRO CPUs.
Please refer to below table for AMD non-XMP memory frequency support.

Ryzen Series CPUs (Matisse):


Ryzen Series CPUs (Pinnacle Ridge):


Ryzen Series CPUs (Picasso):


Ryzen Series CPUs (Summit Ridge):


Ryzen Series CPUs (Raven Ridge):


SR: Single rank DIMM, 1Rx4 or 1Rx8 on DIMM module label
DR: Dual rank DIMM, 2Rx4 or 2Rx8 on DIMM module label

**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.
SlotsAMD Ryzen series CPUs (Matisse, Summit Ridge and Pinnacle Ridge)
- 1 x PCI Express 3.0 x16 Slot (PCIE2: x16 mode)*
- 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode)
AMD Ryzen series CPUs (Picasso, Raven Ridge)
- 1 x PCI Express 3.0 x16 Slot (PCIE2: x8 mode)*
- 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode)
AMD Athlon series CPUs< / b>
- 1 x PCI Express 3.0 x16 Slot (PCIE2: x4 mode)*
- 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode)

- 1 x PCI Express 2.0 x1 Slot
- Supports AMD Quad CrossFireX™ and CrossFireX™

*Supports NVMe SSD as boot disks
AMD Ryzen series CPUs (Matisse, Summit Ridge and Pinnacle Ridge)
- 1 x PCI Express 3.0 x16 Slot (PCIE2: x16 mode)*
- 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 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.)
- 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode)
AMD Athlon series CPUs
- 1 x PCI Express 3.0 x16 Slot (PCIE2: x4 mode)*
- 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode)

- 1 x PCI Express 2.0 x1 Slot
- Supports AMD Quad CrossFireX™ and CrossFireX™

*Supports NVMe SSD as boot disks
Graphics- Integrated AMD Radeon™ Vega Series Graphics in Ryzen Series APU*
- DirectX 12, Pixel Shader 5.0
- Shared memory default 2GB. Max Shared memory supports up to 16GB.**
- Three graphics output options: D-Sub, DVI-D and HDMI
- Supports Triple Monitor
- Supports HDMI with max. resolution up to 4K x 2K (4096x2160) @ 24Hz / (3840x2160) @ 30Hz
- Supports DVI-D with max. resolution up to 1920x1200 @ 60Hz
- Supports D-Sub with max. resolution up to 1920x1200 @ 60Hz
- Supports Auto Lip Sync, Deep Color (12bpc), xvYCC and HBR (High Bit Rate Audio) with HDMI Port (Compliant HDMI monitor is required)
- Supports HDCP 1.4 with DVI-D and HDMI Ports
- Supports 4K Ultra HD (UHD) playback with HDMI Port

*Actual support may vary by CPU

**The Max shared memory 16GB requires 32GB system memory installed.
- Integrated AMD Radeon™ Vega Series Graphics in Ryzen Series APU*
- DirectX 12, Pixel Shader 5.0
- Shared memory default 2GB. Max Shared memory supports up to 16GB.**
- 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) @ 24Hz / (3840x2160) @ 30Hz
- Supports DisplayPort 1.2 with max. resolution up to 4K x 2K (4096x2160) @ 60Hz
- Supports 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 Ports
- Supports 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.
Audio- 7.1 CH HD Audio with Content Protection (Realtek ALC892 Audio Codec)
- Premium Blu-ray Audio support
- Supports Surge Protection
- ELNA Audio Caps
- 7.1 CH HD Audio with Content Protection (Realtek ALC892 Audio Codec)
- Premium Blu-ray Audio support
- Supports Surge Protection
- Nichicon Fine Gold Series Audio Caps
- PCB Isolate Shielding
- Individual PCB Layers for R / L Audio Channel
- Gold Audio Jacks
Lan- PCIE x1 Gigabit LAN 10 / 100 / 1000 Mb / s
- Realtek RTL8111H
- Supports Wake-On-LAN
- Supports Lightning / ESD Protection
- Supports Energy Efficient Ethernet 802.3az
- Supports PXE
- PCIE x1 Gigabit LAN 10 / 100 / 1000 Mb / s
- Realtek RTL8111H
- Supports Wake-On-LAN
- Supports Lightning / ESD Protection
- Supports Energy Efficient Ethernet 802.3az
- Supports PXE
WiFi- n/a- n/a
Rear Panel I/O- 1 x PS / 2 Mouse / Keyboard Port
- 1 x D-Sub Port
- 1 x DVI-D Port
- 1 x HDMI Port
- 2 x USB 2.0 Ports (Supports ESD Protection)
- 1 x USB 3.1 Gen2 Type-A Port (10 Gb / s) (Supports ESD Protection)
- 1 x USB 3.1 Gen2 Type-C Port (10 Gb / s) (Supports ESD Protection)
- 4 x USB 3.1 Gen1 Ports (Supports ESD Protection)
- 1 x RJ-45 LAN Port with LED (ACT / LINK LED and SPEED LED)
- HD Audio Jacks: Line in / Front Speaker / Microphone
- 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 3.1 Gen2 Type-A Port (10 Gb / s) (Supports ESD Protection)
- 1 x USB 3.1 Gen2 Type-C Port (10 Gb / s) (Supports ESD Protection)
- 4 x USB 3.1 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)
Storage- 4 x SATA3 6.0 Gb / s Connectors, support RAID (RAID 0, RAID 1 and RAID 10), NCQ, AHCI and Hot Plug*
- 1 x Ultra M.2 Socket (M2_1), supports M Key type 2242 / 2260 / 2280 M.2 PCI Express module up to Gen3 x4 (32 Gb / s) (with Matisse, Picasso, Summit Ridge, Raven Ridge and Pinnacle Ridge) or Gen3 x2 (16 Gb / s) (with Athlon 2xxGE series APU)**
- 1 x M.2 Socket (M2_2), supports M Key type 2230 / 2242 / 2260 / 2280 M.2 SATA3 6.0 Gb / s module

*M2_2 and SATA3_3 share lanes. If either one of them is in use, the other one will be disabled.

**Supports NVMe SSD as boot disks
Supports ASRock U.2 Kit
- 4 x SATA3 6.0 Gb / s Connectors, support RAID (RAID 0, RAID 1 and RAID 10), NCQ, AHCI and Hot Plug*
- 1 x Ultra M.2 Socket (M2_1), supports M Key type 2242 / 2260 / 2280 M.2 PCI Express module up to Gen3 x4 (32 Gb / s) (with Summit Ridge, Raven Ridge and Pinnacle Ridge) or Gen3 x2 (16 Gb / s) (with Athlon 2xxGE series APU and Raven Ridge 2)**
- 1 x M.2 Socket (M2_2), supports M Key type 2230 / 2242 / 2260 / 2280 M.2 SATA3 6.0 Gb / s module**

*M2_2 and SATA3_3 share lanes. If either one of them is in use, the other one will be disabled.

**Supports NVMe SSD as boot disks
Supports ASRock U.2 Kit
Connector- 1 x COM Port Header
- 1 x TPM Header
- 1 x Chassis Intrusion Header
- 1 x Power LED and Speaker Header
- 1 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 24 pin ATX Power Connector
- 1 x 8 pin 12V Power Connector
- 1 x Front Panel Audio Connector
- 2 x USB 2.0 Headers (Support 4 USB 2.0 ports) (Supports ESD Protection)
- 1 x USB 3.1 Gen1 Header (Supports 2 USB 3.1 Gen1 ports) (Supports ESD Protection)

*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.
- 1 x COM Port Header
- 1 x TPM Header
- 1 x Chassis Intrusion Header
- 1 x Power LED and Speaker Header
- 1 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 24 pin ATX Power Connector
- 1 x 8 pin 12V Power Connector
- 1 x Front Panel Audio Connector
- 2 x USB 2.0 Headers (Support 4 USB 2.0 ports) (Supports ESD Protection)
- 1 x USB 3.1 Gen1 Header (Supports 2 USB 3.1 Gen1 ports) (Supports ESD Protection)

*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.
BIOS- 128Mb AMI UEFI Legal BIOS with multilingual GUI support
- Supports "Plug and Play"
- ACPI 5.1 compliance wake up events
- Supports jumperfree
- SMBIOS 2.3 support
- DRAM Voltage multi-adjustment
- 128Mb AMI UEFI Legal BIOS with multilingual GUI support
- Supports "Plug and Play"
- ACPI 5.1 compliance wake up events
- Supports jumperfree
- SMBIOS 2.3 support
- DRAM Voltage multi-adjustment
Support CD- Drivers, Utilities, AntiVirus Software (Trial Version), Google Chrome Browser and Toolbar- Drivers, Utilities, AntiVirus Software (Trial Version), Google Chrome Browser and Toolbar
Software and UEFISoftware< / b>
- ASRock A-Tuning
- ASRock Polychrome SYNC
- ASRock XFast LAN
UEFI< / b>
- ASRock Full HD UEFI
- ASRock Instant Flash
- ASRock Easy RAID Installer

*These utilities can be downloaded from ASRock Live Update & APP Shop.
Software< / b>
- ASRock A-Tuning
- ASRock Polychrome SYNC
- ASRock XFast LAN
UEFI< / b>
- ASRock Full HD UEFI
- ASRock Instant Flash
- ASRock Easy RAID Installer

*These utilities can be downloaded from ASRock Live Update & APP Shop.
Hardware Monitor- Temperature Sensing: CPU, CPU / Water Pump, Chassis / Water Pump Fans
- Fan Tachometer: CPU, CPU / Water Pump, Chassis / Water Pump Fans
- Quiet Fan (Auto adjust chassis fan speed by CPU temperature): CPU, CPU / Water Pump, Chassis / Water Pump Fans
- Fan Multi-Speed Control: CPU, CPU / Water Pump, Chassis / Water Pump Fans
- CASE OPEN detection
- Voltage monitoring: +12V, +5V, +3.3V, Vcore
- Temperature Sensing: CPU, CPU / Water Pump, Chassis / Water Pump Fans
- Fan Tachometer: CPU, CPU / Water Pump, Chassis / Water Pump Fans
- Quiet Fan (Auto adjust chassis fan speed by CPU temperature): CPU, CPU / Water Pump, Chassis / Water Pump Fans
- Fan Multi-Speed Control: CPU, CPU / Water Pump, Chassis / Water Pump Fans
- CASE OPEN detection
- Voltage monitoring: +12V, +5V, +3.3V, Vcore
OS- Microsoft Windows 10 64-bit- Microsoft Windows 10 64-bit
Certifications- FCC, CE
- ErP / EuP ready (ErP / EuP ready power supply is required)
- FCC, CE
- ErP / EuP ready (ErP / EuP ready power supply is required)
Accessories- Quick Installation Guide, Support CD, I / O Shield
- 2 x SATA Data Cables
- 2 x Screws for M.2 Sockets
- Quick Installation Guide, Support CD, I / O Shield
- 2 x SATA Data Cables
- 2 x Screws for M.2 Sockets