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Micro ATX motherboard, dark PCB with black and grey heatsinks, four DDR4 slots, AM4 socket, multiple PCIe and M.2 slots, rear I/O

ASRock

ASRock B550M PRO4 AMD motherboard

SKU CH-9P3M-9WEVC MPN B550M PRO4

Micro-ATX AM4 board with PCIe 4.0 x16, dual M.2 slots and 128 GB DDR4 support up to 4733 MHz

  • ProcessorSupports AMD Ryzen 5000 Series / 5000 G-Series / 4000 G-Seri
  • ChipsetAMD B550
  • Form factorMicro ATX
  • CPU socketAM4
  • Memory slot count4 × 288pin (DDR4)
  • Supported memoryDDR4 4733+(OC) / 4666(OC) / 4600(OC) / 4533(OC) / 4466(OC) /

Model B550M PRO4

  • Supports Ryzen 5000 and 3000 series CPUs on AM4 socket
  • DDR4 memory overclocks to 4733 MHz across four slots
  • PCIe 4.0 x16 and Gen4 M.2 for fast GPU and storage
  • 8-phase digital power design for stable CPU delivery
  • 1-channel Realtek ALC1200 audio with Nahimic enhancement

AM4 Ryzen platform

The ASRock B550M PRO4 is a micro-ATX motherboard built around the AMD B550 chipset for socket AM4 processors. It supports Ryzen 5000, 5000 G-Series, 4000 G-Series, 3000 and 3000 G-Series CPUs, though a BIOS update may be required for Zen 3 parts. The board is not compatible with Athlon processors.

8-phase Digi Power

An 8-phase Digi Power design delivers smooth current to the CPU and keeps VRM temperatures low during typical workloads. Passive heatsinks on the power stages dissipate heat without adding fan noise. The board draws only the power required by the installed components.

DDR4 4733 OC ceiling

Four 288-pin slots accept unbuffered DDR4 up to 128 GB in dual-channel mode. Supported speeds range from 2133 to 4733+(OC) with Ryzen 5000 G-Series APUs and 4533+(OC) with Ryzen 5000 CPUs. Intel XMP 2.0 profiles are recognised for simplified memory overclocking.

How it compares

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

Price $82.99
Cheaper than about 82% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASRock
Product linePrime
Model nameB550M PRO4
Part numberB550M PRO4
Processor
CPU socketAM4
ChipsetAMD B550
Memory
Memory slot count4 × 288pin (DDR4)
Supported memoryDDR4 4733+(OC) / 4666(OC) / 4600(OC) / 4533(OC) / 4466(OC) / 4400(OC) / 4333(OC) / 4266(OC) / 4200(OC) / 4133(OC) / 4000(OC) / 3866(OC) / 3800(OC) / 3733(OC) / 3600(OC) / 3466(OC) / 3200 / 2933 / 2667 / 2400 / 2133 (AMD Ryzen series APUs (Cezanne & Renoir))*
DDR4 4533+(OC) / 4466(OC) / 4400(OC) / 4333(OC) / 4266(OC) / 4200(OC) / 4133(OC) / 4000(OC) / 3866(OC) / 3800(OC) / 3733(OC) / 3600(OC) / 3466(OC) / 3200 / 2933 / 2667 / 2400 / 2133 (AMD Ryzen series CPUs (Vermeer & Matisse))*
DDR4 3333+(OC) / 3200(OC) / 2933 / 2667 / 2400 / 2133 (AMD Ryzen series APUs (Picasso))*
* For Ryzen Ser
Max supported RAM128 GB
Memory channelsDual Channel
Memory profilesIntel XMP 2.0
ECC supportVaries by processors
BufferingUn-buffered
Storage
SATA ports6 x SATA3 6.0Gb/s*
* M2_2 and SATA3_5_6 share lanes. If either one of them is in use, the other one will be disabled.
SATA and RAID support0/1/10
Graphics
Onboard video chipSupported only by CPU with integrated graphic
Audio & video
Audio chipRealtek ALC1200
Sound channels7.1 Channels
Connectivity
Ethernet controllerRealtek RTL8111H
Maximum network speed1 Gbit/s
Wi-Fi standardWi-Fi 802.11 be
Ports & slots
PCIe 4.0 x16 slots1 x PCI Express 4.0 x16*
* Supports NVMe SSD as boot disks.
* Actual support may vary by CPU.
PCIe 3.0 x16 slots1 x PCI Express 3.0 x16*
* Supports NVMe SSD as boot disks.
PCIe x16 slots1 x PCI Express x16
PCIe x4 slots3 x PCI Express x4
PCIe x1 slots1 x PCI Express 3.0 x1
PCI slots1 x PCI Slot
Additional slots1 x M.2 Socket (Key E), supports type 2230 WiFi/BT module
Rear panel portsAntenna Bracket
1 x PS/2 Mouse/Keyboard Port
1 x D-Sub Port
1 x HDMI Port
1 x DisplayPort 1.4
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 (ASMedia ASM1074 hub) (Supports ESD Protection)
2 x USB 2.0 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
PS/2 ports1
Serial ports3
Video connectors1
HDMI ports1 x HDMI
Ethernet port1 x RJ45
USB 3.1 ports2 x USB 3.1
USB 3.0 ports10 x USB 3.0
USB 2.0 ports9 x USB 2.0
Game/midi ports1
Audio jacks6 Ports
Onboard USB headers2 x USB 2.0 Headers (Support 4 USB 2.0 ports) (Supports ESD Protection)
2 x USB 3.2 Gen1 Headers (Support 4 USB 3.2 Gen1 ports) (Supports ESD Protection)
Power
Power connectors1 × 24-pin ATX Power Connector
1 × 8-pin 12 V Power Connector
Size & build
Form factorMicro ATX
Width and length9.6 in × 9.6 in
Shipping weight1.54 kg
Package size330 × 279 × 76 mm
Compatibility
Windows 11 supportSupported
More details
PCI express 2.0 x161 x PCI Express 2.0 x16
ESATA1 x eSATA 3Gb/s
LightingRGB

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