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Green mini-ITX board with silver heatsinks and rear I/O shield

ASRock

ASRock B550M-ITX/AC AMD motherboard

SKU CH-V3VW-0JETW MPN B550M-ITX/AC

Mini ITX AM4 board supports 3rd Gen Ryzen, dual-channel DDR4 up to 64 GB, PCIe 4.0 M.2, Wi-Fi and 7.1 audio

  • CPU Socket TypeAM4
  • CPU TypeSupports 3rd Gen AMD AM4 Ryzen / future AMD Ryzen Processors
  • ChipsetAMD B550
  • Number of Memory Slots2x288pin (DDR4)
  • Memory StandardAMD Ryzen series CPUs (Matisse) support DDR4 4600+(OC)/ 4533
  • Maximum Memory Supported64GB ** Due to the operating system limitation, the actual m

Option B550M-ITX/AC

Struck-through versions exist but are not stocked here.

  • Compact mini-ITX design fits small-form-factor builds
  • AM4 socket supports 3rd Gen Ryzen and future AMD Ryzen processors
  • B550 chipset enables PCIe 4.0 x16 graphics and Gen4 M.2 storage
  • Dual-channel DDR4 up to 64 GB with XMP 2.0 profiles
  • Integrated WiFi 802.11ac plus Gigabit LAN for wireless and wired connectivity

Compact AMD Ryzen Platform

The ASRock B550M-ITX/AC is a Mini ITX motherboard for the AM4 socket, built around the AMD B550 chipset. It supports 3rd Gen AMD Ryzen processors and future Ryzen CPUs, with a BIOS update available for Zen 3 Ryzen 5000 series. The board fits small-form-factor cases while keeping full desktop connectivity.

Sustained Power Delivery

An 8 Power Phase design uses premium 60A power chokes to keep Vcore voltage stable during long workloads. The chokes raise saturation current up to three times over traditional parts, helping the VRM run cooler when the CPU holds high clocks for extended periods. This layout targets consistent output rather than short bursts.

PCIe 4.0 M.2 for Fast Storage

One Hyper M.2 socket accepts 2280 M Key modules and runs at PCIe 4.0 x4 with Matisse CPUs or PCIe 3.0 x4 with Renoir APUs. It also supports SATA3 6.0 Gb/s M.2 drives and NVMe SSDs as boot devices. This single slot decides whether the board can host a high-speed system drive in a compact build.

Highlights

  • Compact mini-ITX design fits small-form-factor builds
  • AM4 socket supports 3rd Gen Ryzen and future AMD Ryzen processors
  • B550 chipset enables PCIe 4.0 x16 graphics and Gen4 M.2 storage
  • Dual-channel DDR4 up to 64 GB with XMP 2.0 profiles
  • Integrated WiFi 802.11ac plus Gigabit LAN for wireless and wired connectivity

Specifications

BrandASRock
ModelB550M-ITX/AC
CPU Socket TypeAM4
CPU TypeSupports 3rd Gen AMD AM4 Ryzen / future AMD Ryzen Processors *
* Not compatible with AMD Ryzen 5 3400G and Ryzen 3 3200G.
* BIOS update might require for AMD Zen 3 Ryzen 5000 series CPU. Refer to ASRock website for CPU support list.
ChipsetAMD B550
Number of Memory Slots2x288pin (DDR4)
Memory StandardAMD 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*
* For Ryzen Series CPUs (Picasso and Raven Ridge), ECC is only support
Maximum Memory Supported64GB
** 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.
Channel SupportedDual Channel
Memory Performance ProfileIntel XMP 2.0
PCI Express 4.0 x16AMD Ryzen series CPUs (Matisse)
- 1 x PCI Express 4.0 x16 Slot (PCIE1: x16 mode)*
AMD Ryzen series APUs (Renoir)
- 1 x PCI Express 3.0 x16 Slot (PCIE1: x16 mode)*
* Supports PCIe riser cards to extend x8/x8 slots
* Supports NVMe SSD as boot disks
Other Slots1 x Vertical M.2 Socket (Key E) with the bundled WiFi-802.11ac module (on the rear I/O)
Serial ATA (SATA)4 x SATA3 6.0 Gb/s Connectors, support RAID, NCQ, AHCI and Hot Plug
M.21 x Hyper M.2 Socket (M2_1), supports M Key type 2280 M.2 SATA3 6.0Gb/s module and M.2 PCI Express module up to Gen4x4 (64Gb/s) (with Matisse) or Gen3x4 (32Gb/s) (with Renoir)*
* Supports NVMe SSD as boot disks
* Supports ASRock U.2 Kit
SATA RAID0/1/10
Onboard Video ChipsetIntegrated 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.
Audio ChipsetRealtek ALC887
Audio Channels7.1 Channels
LAN ChipsetRealtek RTL8111H
Max LAN Speed1Gbps
Wireless LANIntel 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
BluetoothSupports Bluetooth 4.2+ High speed class II
Back I/O Ports2 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
Onboard USB1 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)
Other Connectors1 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 Front Panel Audio Connector
* 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.
Form FactorMini ITX
LED LightingRGB
Dimensions (W x L)6.7" x 6.7"
Power Pin1 x 24-pin ATX Power Connector
1 x 8-pin 12V Power Connector
Windows 11Supported
FeaturesUnique Feature:
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
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, +1.8VSB, VDDP Voltage Multi-adjustment
Software and UEFI:
Software
- ASRock Motherboard Utility
Package ContentsAccessories:
- Quick Installation Guide, Support CD, I/O Shield
- 2 x SATA Data Cables
- 2 x ASRock WiFi 2.4/5 GHz Antennas
Shipping weight0.84 kg
Package size324 × 292 × 64 mm

Other versions of this model

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Questions about this item

Does the board's 8 power-phase design and 60 A chokes keep VRM temperatures low during sustained all-core loads?

The 8 power-phase design with premium 60 A chokes delivers smooth power to the CPU and is rated for lower operating temperatures under heavy loads.

Which components must I already have to complete a build around this AM4 mini-ITX board?

You need an AM4 Ryzen processor, DDR4 memory modules, a compatible mini-ITX case and power supply, and storage drives such as SATA SSDs or an M.2 2280 device.

Can I reuse my existing SATA drives and PCIe 3.0 add-in cards with this B550 board?

Four SATA3 6.0 Gb/s ports support existing SATA drives, and the PCIe 4.0 x16 slot is backward compatible with PCIe 3.0 cards.

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