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ASRock AMD B450M Pro4 Ryzen MicroATX Motherboard

Stock may vary from item pictured. Retail pictures do not guarantee retail products.
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ASRock B450M Pro4, AMD B450, AM4, DDR4, 2x M.2, 2-Way CrossFire, Realtek GbE, USB 3.1 Gen2 A+C, MicroATX

This item is currently discontinued and at present, we have no replacement on order.
 Web Only Product 
Quickcode: 71668  
Stock code: MBD-90-MXB8F0-A0UAYZ
Manuf. code: B450M PRO4
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B450M Pro4 mATX Ryzen Gaming Motherboard by ASROCK


ASROCK PREMIUM QUALITY MICRO ATX MOTHERBOARD The ASRock B450M Pro4 is the best Micro ATX motherboard for professionals who command an excellent performance for their system. Prepared with M.2 slot that supports both SATA3 6Gb/s and four PCIe Gen3, the quality interface that excels data transfer speeds up to 32Gb/s. Featuring high quality manufactured 2oz Copper, for PCB layers providing lower temperatures and higher energy productivity for overclocking. With on-board Dual USB 3.1 Gen 2 ports, users can accomplish double the data transfer rate.

Dual M.2 Slots | USB 3.1 Gen2 | Triple Monitor Support (VGA, DVI-D, HDMI

Dual M.2 Slots


Impressive data transfer speeds up to 32Gb/s The B450M Pro4 motherboard is assembled with M.2 slot that supports both SATA3 6Gb/s and four PCIe Gen3. The ASRock Ultra M.2 interface that boosts data transfer speeds up to 32Gb/s. Compatible with ASRock’s U.2 Kit for installing some of the world’s speediest U.2 PCIe Gen3 x4 SSD.

AMD StoreMI Technology


The powerful pc tool AMD StoreMI technology automatically moves the data you access the most to the SSD, so you get the best of both worlds: SSD responsiveness, and mechanical hard disk capacity. You can also use up to 2GB of RAM as a last-level cache for ultra-fast data.

On-board Dual USB 3.1 Gen2


up to 10 Gbps data transfer rates The B450M Pro4 motherboard features a pair of on-board 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, which delivers up to 10 Gbps data transfer rates.

Superior Motherboard Alloy

power choke

PREMIUM POWER CHOKE Compared to traditional chokes, ASRock’s premium 42A power chokes effectively make the saturation current up to three times better, thus providing enhanced and improved Vcore voltage to the motherboard.


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

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.

fabric density

HIGH DENSITY GLASS FABRIC PCB ASRock features the High Density Glass Fabric PCB design, which reduces the gaps between the PCB layers to protect the motherboard against electrical shorts caused by humidity.

Support Software and Premium Components


TRIPLE MONITOR Graphics, graphics and even more graphics! You've demanded for more eye candy, so this motherboard supports Triple Monitor. You may choose up to three display interfaces from the rear i/o to connect monitors and use them simultaneously without installing another graphics card.


3 GRAPHICS OUTPUTSComplete with all three types of most used connectors! Packed with a D-Sub + DVI-D + HDMI combo. Plus the HDMI port supports 4K resolution.


DIGI POWERUnlike traditional motherboards that use analog power, this motherboard uses a next generation digital PWM (Pulse-Width Modulation) design, which provides CPU Vcore voltage more efficiently and smoothly, so that the stability and lifespan of the motherboard is greatly enhanced.


Solid capacitor designASRock applied solid capacitors on this motherboard. With these solid caps, this motherboard is allowed to perform more stably and ensure longer lifetime.


FULL SPIKE PROTECTIONSome 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.


ELNA audio capsASRock applied ELNA audio capacitors on mainstream and entry-level motherboards. Compared with traditional solid caps, the leakage current of ELNA audio caps is merely 3uA. This is the key to reduce noise level significantly and satisfy even the pickiest audiophiles.


A-tuning softwareA-Tuning is ASRock's multi-purpose software suite with a new interface, more new features and improved utilities.


LIVE UPDATE & APP SHOPASRock Live Update & APP Shop is designed for your convenience. Users can download various apps and support software, optimise your system with ease and keep your motherboard up to date with the:


- Model: ASRock B450M Pro4 / 90-MXB8F0-A0UAYZ
- Form Factor: MicroATX
- CPU Socket: AM4
- Chipset: AMD B450
- Memory: DDR4 / Dual Channel / Max 64GB
- Memory Speed (Mhz): 2133 - 3200 O.C.
- Audio: Realtek ALC892 7.1 HD Audio
- Primary GPU Interface: PCIe 3.0 (x16)
- Multi-GPU Support: 2-Way CrossFire
- On-Board Graphics Connectors: D-Sub (VGA) / DVI-D / HDMI
- Network Interface Type: Wired Gigabit LAN (10/100/1000)
- Network Chip/Modules: 1 x Realtek RTL8111H (Gigabit LAN)

- Expansion Slots:
: 1 x M.2, 22-30/42/60/80, SATA
: 1 x M.2, 22-42/60/80, PCIe Gen3
: 1 x PCIe 2.0 x1
: 1 x PCIe 3.0 x16
: 1 x PCIe 3.0 x16 (x4 Bandwidth)
- SATA Support: SATA3 / M.2
- RAID Support via: SATA
- Storage Mode Support: AHCI / Hot Plug / NCQ / RAID 0 / RAID 1 / RAID 10

- Internal I/O:
: 1 x 24-pin (Power)
: 1 x 8-pin (Power)
: 1 x Addressable Digital RGB Header
: 1 x AMD Fan LED Header
: 3 x Chassis Water Pump/Fan Connector
: 1 x CPU Fan Connector
: 1 x CPU Water Pump/Fan Connector
: 1 x Front Panel Audio Header
: 1 x Power LED / Speaker Header
: 1 x RGB Header
: 1 x Serial (COM) Header
: 1 x TPM Header
: 2 x USB 2.0 Header
: 1 x USB 3.1 Gen1 Header

- Rear I/O Connectors:
: 1 x 10/100/1000 (LAN)
: 1 x D-Sub (VGA) Out
: 1 x DVI-D
: 1 x Front Speaker Out
: 1 x HDMI
: 1 x Line In
: 1 x Mic-In
: 1 x PS/2 Keyboard/Mouse Combo
: 2 x USB 2.0
: 4 x USB 3.1 Gen1 Type-A
: 1 x USB 3.1 Gen2 Type-A
: 1 x USB 3.1 Gen2 Type-C

- Board Dimensions: 244 x 244 mm

Warranty Information:

Manufacturer asrock
Warranty Type Direct with Manufacturer
Manufacturer Website
Manufacturer Phone 00 31 243 454433
Warranty Period (yrs)2
Number of PCI-E Slots - x160
RAM Slots0
Maximum RAM0
SATA II Ports0
USB 3.0 Ports0
USB 2.0 Ports0

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