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Green ATX motherboard with silver heatsinks and black slots

ASRock

ASRock B550 PRO4 AM4 AMD motherboard

SKU CH-9EWV-2GDMX

ATX board with AM4 socket for Ryzen CPUs, four DDR4 slots up to 128 GB, PCIe 4.0 x16 and Gen4 M.2, six SATA 6.0 Gb/s ports, 7.1 audio and Gigabit LAN

  • CPU Socket TypeAM4
  • CPU TypeSupports 3rd Gen AMD AM4 Ryzen / future AMD Ryzen Processors
  • ChipsetAMD B550
  • Number of Memory Slots4x288pin (DDR4)
  • Memory StandardAMD Ryzen series CPUs (Matisse) support DDR4 4533+(OC)/ 4466
  • Maximum Memory Supported128GB ** Due to the operating system limitation, the actual
  • Supports 3rd Gen AM4 Ryzen and future AMD Ryzen processors
  • Dual-channel DDR4 memory up to 128 GB across four slots
  • PCIe 4.0 x16 slot with Matisse CPUs for high-speed graphics and NVMe storage
  • Six SATA 6.0 Gb/s ports with RAID 0, 1, 10 support
  • Realtek ALC1200 7.1-channel audio and RTL8111H LAN

AM4 Socket B550 Board

The ASRock B550 PRO4 is an ATX motherboard built around the AMD B550 chipset and AM4 socket. It supports 3rd Gen AMD AM4 Ryzen processors and future AMD Ryzen processors with a possible BIOS update. The board provides four 288-pin DDR4 memory slots running in dual-channel mode up to 128GB. It targets builders who want PCIe 4.0 graphics and NVMe support on a mainstream platform.

Matisse or Renoir CPU Fit

This board suits owners of Ryzen Matisse CPUs who need a PCIe 4.0 x16 slot and a Gen4 M.2 socket for fast NVMe storage. Renoir APU users can also install here but will operate the primary x16 slot and the top M.2 at PCIe 3.0 speeds. Buyers with a Ryzen 5 3400G or Ryzen 3 3200G should look elsewhere because those APUs are explicitly not compatible.

Rear I/O and Expansion Extras

The rear panel includes HDMI and D-Sub video outputs driven by the APU integrated Radeon Vega graphics, Realtek ALC1200 7.1-channel audio, and a Realtek RTL8111H Gigabit LAN port. Six SATA3 6.0Gb/s connectors support RAID 0, 1, 10 alongside two PCIe 3.0 x1 slots and a Key E M.2 2230 socket for Wi-Fi or Bluetooth modules. Note that M2_3 and SATA3_5_6 share lanes so only one can be active.

Highlights

  • Supports 3rd Gen AM4 Ryzen and future AMD Ryzen processors
  • Dual-channel DDR4 memory up to 128 GB across four slots
  • PCIe 4.0 x16 slot with Matisse CPUs for high-speed graphics and NVMe storage
  • Six SATA 6.0 Gb/s ports with RAID 0, 1, 10 support
  • Realtek ALC1200 7.1-channel audio and RTL8111H LAN

Specifications

BrandASRock
ModelB550 PRO4
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 Slots4x288pin (DDR4)
Memory StandardAMD Ryzen series CPUs (Matisse) support 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 ECC & non-ECC, un-buffered memory*
AMD Ryzen series APUs (Renoir) 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), ECC is only supported with PRO CPUs.
Maximum Memory Supported128GB
** 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
PCI Express 4.0 x16AMD Ryzen series CPUs (Matisse)
- 1 x PCI Express x16 Slots (PCIE1: Gen4x16 mode)*
AMD Ryzen series APUs (Renoir)
- 1 x PCI Express x16 Slots (PCIE1: Gen3x16 mode)*
* Supports NVMe SSD as boot disks
PCI Express 3.0 x16AMD Ryzen series CPUs (Matisse)
- 1 x PCI Express x16 Slots (PCIE3: Gen3 x4 mode)*
AMD Ryzen series APUs (Renoir)
- 1 x PCI Express x16 Slots (PCIE3: Gen3 x4 mode)*
* Supports NVMe SSD as boot disks
PCI Express x12 x PCI Express 3.0 x1 Slots
Other Slots1 x M.2 Socket (Key E), supports type 2230 WiFi/BT module
Serial ATA (SATA)6 x SATA3 6.0Gb/s Connectors, support RAID, NCQ, AHCI and Hot Plug*
* M2_3 and SATA3_5_6 share lanes. If either one of them is in use, the other one will be disabled.
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)**
1 x M.2 Socket (M2_3), supports M Key type 2242/2260/2280 M.2 SATA3 6.0Gb/s module and M.2 PCI Express module up to Gen3 x2 (16Gb/s)**
** 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 D-Sub ports by independent display controllers
Supports HDMI 2.1 with max. resolution up to 4K x 2K (4096x2160) @ 60Hz
Supports D-Sub with max. resolution up to 1920x1200 @ 60Hz
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
Audio ChipsetRealtek ALC1200
Audio Channels7.1 Channels
LAN ChipsetRealtek RTL8111H
Max LAN Speed1Gbps
Back I/O PortsAntenna Bracket
1 x PS/2 Mouse/Keyboard Port
1 x D-Sub Port
1 x HDMI Port
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 (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

Questions about this item

Will a Ryzen 5000 series processor work out of the box?

A BIOS update may be required before a Zen 3 Ryzen 5000 CPU will post. Check the ASRock support page for the latest firmware and update instructions.

Can I run four sticks of DDR4 at 3200 MHz?

The board has four 288‑pin slots supporting dual‑channel DDR4 up to 128 GB. 3200 MHz is a native speed for Matisse CPUs; higher frequencies are possible with overclocking.

Does the primary M.2 slot share bandwidth with any SATA ports?

The Hyper M.2 socket (M2_1) runs at Gen4 x4 with Matisse or Gen3 x4 with Renoir and does not disable SATA ports. The second M.2 slot (M2_3) shares lanes with SATA3_5 and SATA3_6.

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