Model

Chipsets

Brand	ASRock
Model	B550M PRO4

CPU Socket Type	AM4
CPU Type	Supports AMD Ryzen 5000 Series / 5000 G-Series / 4000 G-Series / 3000 Series / 3000 G-Series Processors* * Not compatible with AMD Athlon Processors. * BIOS update might require for AMD Zen 3 Ryzen 5000 Series CPU. Refer to ASRock website for CPU support list.

Memory

Chipset	AMD B550

Expansion Slots

Number of Memory Slots	4x288pin (DDR4)
Memory Standard	DDR4 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 Series APUs (Picasso, Cezanne and Renoir), ECC is only supported with PRO CPUs.
Maximum Memory Supported	128GB
Channel Supported	Dual Channel
ECC Supported	ECC supported varies by processors
Buffer Supported	Un-buffered

Storage Devices

PCI Express 4.0 x16	1 x PCI Express 4.0 x16* * Supports NVMe SSD as boot disks. * Actual support may vary by CPU.
PCI Express 3.0 x16	1 x PCI Express 3.0 x16* * Supports NVMe SSD as boot disks.
PCI Express x1	1 x PCI Express 3.0 x1
Other Slots	1 x M.2 Socket (Key E), supports type 2230 WiFi/BT module

Onboard Video

SATA 6Gb/s	6 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.
M.2	1 x Hyper M.2 Socket (M2_1), supports M Key type 2280 M.2 PCI Express module up to Gen4x4 (64 Gb/s) (with Vermeer, Matisse) or Gen3x4 (32 Gb/s) (with Cezanne, Renoir and Picasso)* 1 x M.2 Socket (M2_2), supports M Key type 2280 M.2 SATA3 6.0 Gb/s module and M.2 PCI Express module up to Gen3 x2 (16 Gb/s)* * Supports NVMe SSD as boot disks. * Supports ASRock U.2 Kit.
SATA RAID	0/1/10

Onboard Audio

Onboard Video Chipset	Supported only by CPU with integrated graphic

Onboard LAN

Audio Chipset	Realtek ALC1200
Audio Channels	7.1 Channels

Rear Panel Ports

Back I/O Ports

Antenna 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

Physical Spec

Onboard USB

2 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)

Other Connectors

1 x COM Port Header 1 x SPI TPM Header 1 x Power LED and Speaker Header 2 x RGB LED Headers* 2 x Addressable LED Headers** 1 x CPU Fan Connector (4-pin)*** 1 x CPU/Water Pump Fan Connector (4-pin) (Smart Fan Speed Control) 4 x Chassis/Water Pump Fan Connectors (4-pin) (Smart Fan Speed Control)**** 1 x Front Panel Audio Connector * Support in total up to 12V/3A, 36W LED Strip. ** Support in total up to 5V/3A, 15W LED Strip. *** The CPU Fan Connector supports the CPU fan of maximum 1A (12W) 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, CHA_FAN3/WP and CHA_FAN4/WP can auto detect if 3-pin or 4-pin fan is in use.

Windows 11 Compatibility

Form Factor	Micro ATX
LED Lighting	RGB
Dimensions (W x L)	9.6" x 9.6"
Power Pin	1 x 24-pin ATX Power Connector 1 x 8-pin 12V Power Connector

Features

Windows 11	Supported

Packaging

Features

Unique Feature: ASRock USB 3.2 Gen2 - ASRock USB 3.2 Gen2 Type-A Port (10Gb/s) - ASRock USB 3.2 Gen2 Type-C Port (10Gb/s) ASRock Super Alloy - XXL Aluminum Alloy Heatsink - Premium 50A Power Choke - Sapphire Black PCB - High Density Glass Fabric PCB - 2oz Copper PCB ASRock Steel Slot Gen4 ASRock Full Coverage M.2 Heatsink ASRock Hyper M.2 (PCIe Gen4x4) ASRock POST Status Checker (PSC) ASRock Full Spike Protection (for all USB, Audio, LAN Ports) ASRock Live Update & APP Shop BIOS: - 256MB AMI UEFI Legal BIOS with GUI support - Supports "Plug and Play" - ACPI 5.1 compliance wake up events - Supports jumperfree - SMBIOS 2.3 support - CPU, CPU VDDCR_SOC, DRAM, VPPM, 1.05V_PROM_S5, 2.5V_PROM, +1.8VSB, VDDP Voltage Multi-adjustment Software and UEFI: Software - ASRock Motherboard Utility (A-Tuning) - ASRock XFast LAN UEFI - ASRock Full HD UEFI - ASRock Instant Flash * These utilities can be downloaded from ASRock Live Update & APP Shop. Support CD: - Drivers, Utilities, AntiVirus Software (Trial Version), Google Chrome Browser and Toolbar 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 - Voltage monitoring: +12V, +5V, +3.3V, CPU Vcore, CPU VDDCR_SOC, DRAM, VPPM, 1.05V_PROM_S5, +1.8V, VDDP OS: - Microsoft Windows 10 64-bit / 11 64-bit Certifications: - FCC, CE - ErP/EuP ready (ErP/EuP ready power supply is required)

Package Contents	Accessories: Quick Installation Guide, Support CD, I/O Shield 2 x SATA Data Cables 2 x Screws for M.2 Sockets

LAN ChipsetRealtek RTL8111H
Max LAN Speed

10/100/1000Mbps