B550M-ITX/AC DDR4

Supports AMD AM4 Socket Ryzen™ 3000, 3000 G-Series, 4000 G-Series, 5000 and 5000 G-Series Desktop Processors*
Digi Power design
8 Power Phase design

_{*Not compatible with AMD Athlon™ Processors.
*Not compatible with AMD Ryzen™ 5 3400G and Ryzen™ 3 3200G.}

AMD

AM4

AMD B550

Dual Channel DDR4 Memory Technology
2 x DDR4 DIMM Slots
AMD Ryzen series CPUs (Matisse) support DDR4 4600+(OC) / 4533(OC) / 4466(OC) / 4400(OC) / 4333(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 ECC & non-ECC, un-buffered memory*
AMD Ryzen series APUs support 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 ECC & non-ECC, un-buffered memory*
Max. capacity of system memory: 64GB**
Supports Extreme Memory Profile (XMP) memory modules
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.
**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.

4600

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 1.4 ports by independent display controllers
Supports HDMI 2.1 with max. resolution up to 4K x 2K (4096x2160) @ 60Hz
Supports DisplayPort 1.4 Input with max. resolution up to 5K (5120x2880)@120Hz
Supports Auto Lip Sync, Deep Color (12bpc), xvYCC and HBR (High Bit Rate Audio) with HDMI 2.1 Port (Compliant HDMI monitor is required)
Supports HDR (High Dynamic Range) with HDMI 2.1
Supports HDCP 2.3 with HDMI 2.1 and DisplayPort 1.4 Ports
Supports 4K Ultra HD (UHD) playback with HDMI 2.1 and DisplayPort 1.4 Ports
Supports Microsoft^® PlayReady

*Actual support may vary by CPU
**The Max shared memory 16GB requires 32GB system memory installed.

N/A

7.1 CH HD Audio (Realtek ALC887 Audio Codec)
Supports Surge Protection

AMD Ryzen series CPUs (Matisse)
- 1 x PCI Express 4.0 x16 Slot (PCIE1: x16 mode)*
AMD Ryzen series APUs
- 1 x PCI Express 3.0 x16 Slot (PCIE1: x16 mode)*

- 1 x Vertical M.2 Socket (Key E) with the bundled WiFi-802.11ac module (on the rear I/O)

*Supports PCIe riser cards to extend x8/x8 slots
Supports NVMe SSD as boot disks

PCIe 4.0

4 x SATA3 6.0 Gb/s Connectors, support RAID (RAID 0, RAID 1 and RAID 10), NCQ, AHCI and Hot Plug

1 x Hyper M.2 Socket (M2_1), supports M Key type 2280 M.2 SATA3 6.0 Gb/s module and M.2 PCI Express module up to Gen4x4 (64 Gb/s) (with Matisse) or Gen3x4 (32 Gb/s)**

*Supports NVMe SSD as boot disks
Supports ASRock U.2 Kit

NVMe, SATA

1

2 x USB 2.0 Ports (Supports ESD Protection)
3 x USB 3.2 Gen1 Type-A Ports (Supports ESD Protection)
1 x USB 3.2 Gen1 Type-C Port (Supports ESD Protection)
1 x USB 2.0 Header (Supports 2 USB 2.0 ports) (Supports ESD Protection)
1 x USB 3.2 Gen1 Header (Supports 2 USB 3.2 Gen1 ports) (Supports ESD Protection)

1 x RGB LED Header*
1 x Addressable LED Header**
1 x CPU Fan Connector (4-pin)***
2 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
1 x USB 2.0 Header (Supports 2 USB 2.0 ports) (Supports ESD Protection)
1 x USB 3.2 Gen1 Header (Supports 2 USB 3.2 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 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.
CHA_FAN1/WP and CHA_FAN2/WP can auto detect if 3-pin or 4-pin fan is in use.

2 x Antenna Ports
1 x PS/2 Mouse/Keyboard Port
1 x HDMI Port
1 x DisplayPort 1.4
2 x USB 2.0 Ports (Supports ESD Protection)
3 x USB 3.2 Gen1 Type-A Ports (Supports ESD Protection)
1 x USB 3.2 Gen1 Type-C Port (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

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

Intel^® 802.11ac WiFi Module
Supports IEEE 802.11a/b/g/n/ac
Supports Dual-Band (2.4/5 GHz)
Supports high speed wireless connections up to 433Mbps
Supports Bluetooth 4.2 + High speed class II

Mini ITX

Temperature Sensing: CPU, Chassis/Water Pump Fans
Fan Tachometer: CPU, Chassis/Water Pump Fans
Quiet Fan (Auto adjust chassis fan speed by CPU temperature): CPU, Chassis/Water Pump Fans
Fan Multi-Speed Control: CPU, Chassis/Water Pump Fans
Voltage monitoring: +12V, +5V, +3.3V, CPU Vcore

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, +1.8VSB, VDDP Voltage Multi-adjustment

ASRock Super Alloy
- Premium 60A Power Choke
- 50A Dr.MOS
- Sapphire Black PCB
- High Density Glass Fabric PCB

Intel^® 802.11ac WiFi
ASRock Full Coverage M.2 Heatsink
ASRock Hyper M.2 (PCIe Gen4x4)
ASRock Full Spike Protection (for all USB, Audio, LAN Ports)
ASRock Live Update & APP Shop

Software
- ASRock Motherboard Utility (A-Tuning)
- ASRock Polychrome SYNC
- ASRock XFast LAN
UEFI
- ASRock Full HD UEFI
- ASRock Instant Flash

*These utilities can be downloaded from ASRock Live Update & APP Shop.

Microsoft^® Windows^® 10 64-bit

Quick Installation Guide, Support CD, I/O Shield
2 x SATA Data Cables
2 x ASRock WiFi 2.4/5 GHz Antennas