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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

  • CPU Socket TypeAM4
  • CPU TypeSupports AMD Ryzen 5000 Series / 4000 G-Series / 3000 Series
  • ChipsetAMD B550
  • Number of Memory Slots4x288pin (DDR4)
  • Memory StandardDDR4 4733(OC)+ / 4666(OC) / 4600(OC) / 4533(OC) / 4466(OC) /
  • Maximum Memory Supported128GB

Option B550 PHANTOM GAMING 4 AC

Struck-through versions exist but are not stocked here.

  • 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.

Highlights

  • 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

Specifications

BrandASRock
ModelB550 Phantom Gaming 4/ac
CPU Socket TypeAM4
CPU TypeSupports AMD Ryzen 5000 Series / 4000 G-Series / 3000 Series 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 Slots4x288pin (DDR4)
Memory StandardDDR4 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))
Maximum Memory Supported128GB
Channel SupportedDual Channel
Memory Performance ProfileIntel XMP 2.0
ECC SupportedYes
Buffer SupportedUn-buffered
PCI Express 4.0 x161 x PCI Express 4.0 x16*
* Actual support may vary by CPU.
* Supports NVMe SSD as boot disks.
PCI Express 3.0 x161 x PCI Express 3.0 x16*
* Supports NVMe SSD as boot disks.
PCI Express x12 x PCI Express 3.0 x1
Other Slots1 x M.2 Socket (Key E) with the bundled WiFi-802.11ac module
Serial ATA (SATA)4 x SATA 6Gb/s
M.21 x Hyper M.2 Socket (M2_1), supports M Key type 2260/2280/22110 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 ChipsetSupported only by CPU with integrated graphic
Audio ChipsetRealtek ALC1200
Audio Channels7.1 Channels
LAN ChipsetRealtek RTL8111H
Max LAN Speed1Gbps
Wireless LANIntel 802.11ac WiFi Module
IEEE 802.11a/b/g/n/ac
BluetoothBluetooth 4.2
Back I/O 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 USB2 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)
Other Connectors1 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
Form FactorATX
LED LightingRGB
Dimensions (W x L)12.0" x 9.6"
Power Pin1 x 24-pin ATX Power Connector
1 x 8-pin 12V Power Connector
1 x 4-pin 12V Power Connector
Windows 11Supported
FeaturesGaming Armor:
Memory
- 15µ Gold Contact in DIMM Slots
Cooling
- XXL Aluminum Alloy Heatsink
Audio
- Nahimic Audio
Unique Feature:
ASRock Super Alloy
- XXL Aluminum Alloy Heatsink
- Premium 50A Power Choke
- Sapphire Black PCB
- High Density Glass Fabric PCB
- 2oz Copper PCB
Intel 802.11ac WiFi
ASRock Steel Slot Gen4
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
-
Package ContentsAccessories:
- 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
Shipping weight1.36 kg
Package size337 × 267 × 64 mm

Other versions of this model

4 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

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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