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ATX motherboard, black PCB with grey heatsinks, AM4 socket, four DDR4 slots, PCIe x16 and x1 slots, M.2 shield, rear I/O with Wi-Fi

ASRock

ASRock B550 PHAN GAM 4 AC AMD motherboard

SKU CH-M012-8FY0Y MPN B550 PHAN GAM 4 AC

ATX AM4 board with PCIe 4.0 M.2, dual-band 802.11ac Wi-Fi, 7.1 audio and four DDR4 slots up to 128 GB

  • ProcessorSupports AMD Ryzen 5000 Series / 4000 G-Series / 3000 Series
  • ChipsetAMD B550
  • Form factorATX
  • CPU socketAM4
  • Memory slot count4 × 288pin (DDR4)
  • Supported memoryDDR4 4733(OC)+ / 4666(OC) / 4600(OC) / 4533(OC) / 4466(OC) /

Model B550 PHANTOM GAMING 4 AC

  • Supports Ryzen 5000 and 3000 series CPUs on AM4 socket
  • DDR4 memory up to 4733 OC across four slots with 128 GB capacity
  • PCIe 4.0 x16 slot plus Hyper M.2 Gen4 x4 for fast GPU and SSD
  • 8 power phase design with Digi Power delivers stable CPU voltage
  • Wi‑Fi 802.11ac plus Gigabit LAN for wired and wireless networking

AM4 Socket AMD B550 Board

The ASRock B550 PHAN GAM 4 AC is an ATX motherboard built around the AMD B550 chipset for AM4 processors. It supports Ryzen 5000 series, 4000 G-series and 3000 series CPUs, though a BIOS update may be required for Zen 3 parts. The board includes a bundled WiFi 802.11ac module in the Key E M.2 socket.

Suits Ryzen 5000 or 3000 Builders

This board suits builders pairing a Ryzen 5000 or 3000 series CPU with DDR4 memory and a single PCIe 4.0 graphics card. It is not compatible with Ryzen 5 3400G or Ryzen 3 3200G APUs. Users needing more than one PCIe 4.0 x16 slot or native USB 3.2 Gen2 ports should look elsewhere.

One PCIe 4.0 x16 Slot Decides

The single PCI Express 4.0 x16 slot is the specification that decides fit. It delivers Gen4 bandwidth to one graphics card or NVMe adapter when a Matisse CPU is installed. A second PCIe 3.0 x16 slot and two PCIe 3.0 x1 slots handle additional cards at lower speeds.

How it compares

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

Price $101.99
Cheaper than about 75% of the 1,906 comparable items (median $224.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameASRock
Model nameB550 Phantom Gaming 4/ac
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 (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 (Matisse))
Max supported RAM128 GB
Memory channelsDual Channel
Memory profilesIntel XMP 2.0
ECC supportYes
BufferingUn-buffered
Storage
SATA ports4 x SATA 6Gb/s
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 standardIntel 802.11ac WiFi Module
IEEE 802.11a/b/g/n/ac
Bluetooth support4.2
Ports & slots
PCIe 4.0 x16 slots1 x PCI Express 4.0 x16*
* Actual support may vary by CPU.
* Supports NVMe SSD as boot disks.
PCIe 3.0 x16 slots1 x PCI Express 3.0 x16*
* Supports NVMe SSD as boot disks.
PCIe x1 slots2 x PCI Express 3.0 x1
Additional slots1 x M.2 Socket (Key E) with the bundled WiFi-802.11ac module
Rear panel ports2 x Antenna Ports
1 x PS/2 Mouse/Keyboard Port
1 x HDMI Port
6 x USB 3.2 Gen1 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
Onboard USB headers2 x USB 2.0 Headers (Support 4 USB 2.0 ports) (Supports ESD Protection)
1 x USB 3.2 Gen1 Header (Supports 2 USB 3.2 Gen1 ports) (Supports ESD Protection)
Power
Power connectors1 × 24-pin ATX Power Connector
1 × 8-pin 12 V Power Connector
1 × 4-pin 12 V Power Connector
Size & build
Form factorATX
Width and length12.0 in × 9.6 in
Shipping weight1.36 kg
Package size337 × 267 × 64 mm
Compatibility
Windows 11 supportSupported
In the box
In the boxAccessories:
- Quick Installation Guide, Support CD, I/O Shield
- 2 x SATA Data Cables
- 2 x ASRock WiFi 2.4/5 GHz Antennas
- 1 x Screw for M.2 Socket
More details
LightingRGB

Other versions of this model

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Questions about this item

What does the DDR4 4733(OC)+ memory speed mean once the board is built?

The board can run DDR4 modules at up to 4733 MT/s when overclocked, with lower speeds such as 3200 MT/s supported natively depending on the Ryzen CPU installed.

How does the PCIe 4.0 x16 slot limit graphics or storage performance?

The primary x16 slot runs at PCIe 4.0 with a Ryzen 5000 series CPU, giving 64 Gb/s bandwidth for a graphics card or NVMe adapter; with a Ryzen 3000 CPU it falls back to PCIe 3.0 at 32 Gb/s.

What physical space and mounting does the Hyper M.2 socket need?

The M2_1 socket accepts M-key modules in 2260, 2280 or 22110 lengths and is secured with a single screw standoff on the board.

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