ASRock B550M Pro4 AM4 Micro-ATX Motherboard - DDR4, PCIe 4.0
ASRock
ASRock B550M Pro4 AM4 Micro-ATX Motherboard - DDR4, PCIe 4.0
The ASRock B550M Pro4 is a Micro-ATX motherboard built for Ryzen 5000 and older-generation processor builds. It combines PCIe 4.0 support with a sturdy 8-phase power delivery and comprehensive connectivity, making it a capable choice for gamers and enthusiasts building or upgrading mid-range systems.
Why this product
PCIe 4.0 ready with strong power delivery
One PCIe 4.0 x16 slot backed by an 8-phase power design with 50A chokes ensures stable performance for high-end graphics cards and NVMe drives. The reinforced slot has extra anchor points and a stronger latch to support heavy cards securely.
Supports Ryzen 5000 and earlier AM4 processors
AM4 socket compatibility spans Ryzen 3000 through 5000 series, including G-Series APUs with integrated graphics. Check your specific processor against the compatibility list before purchase.
Fast memory support with overclocking headroom
Four DDR4 DIMM slots reach up to 128 GB capacity and support speeds from 2133 to 4733+ MHz overclocked, giving enthusiasts plenty of tuning options.
Multiple storage and expansion options
Six SATA3 ports, one PCIe 4.0 M.2 slot, one PCIe 3.0 M.2 slot, and an M.2 Key E slot for WiFi modules provide flexibility for drives and wireless connectivity.
Generous USB and audio connectivity
Two USB 3.2 Gen2 ports on the rear (one Type-C), eight USB 3.2 Gen1 ports, plus Realtek ALC1220 7.1 audio with Nahimic ensure modern peripherals and sound quality.
RGB and troubleshooting features included
Onboard RGB headers support Polychrome RGB Sync for lighting effects, and the POST Status Checker helps diagnose startup problems quickly.
- Form FactorMicro ATX
- ChipsetAMD B550
- CPU SocketAMD AM4
- Memory CapacityUp to 128 GB DDR4
- PCIe 4.0 Slots1 x PCIe 4.0 x16
- Storage Ports6 x SATA3, 2 x M.2 (Gen4 & Gen3)
- USB 3.2 Gen22 (1 Type-A, 1 Type-C)
- SKUASR-2019
- EAN4710483931598
- Ryzen 5000 series processors and Ryzen 5000 G-Series APUs with integrated graphics.
- Ryzen 3000, 3000 G-Series, and 4000 G-Series processors; will require a BIOS update on first use.
- DDR4 memory up to 128 GB across four DIMM slots, supporting both standard and high-speed overclocked modules.
- PCIe 4.0 graphics cards and NVMe storage drives; also supports older PCIe 3.0 and PCIe 2.0 devices.
- AMD Radeon graphics cards for dual-GPU setups via CrossFireX; not compatible with NVIDIA multi-GPU configurations.
- WiFi expansion requires a compatible M.2 Key E module installed in the dedicated slot; no WiFi included.
Best for
- Ryzen 5000 gaming builds in compact cases
- Enthusiasts who want PCIe 4.0 without high-end pricing
- Overclocking and memory tuning on a budget
- Builders who need multiple storage drives and USB devices
- Systems using Ryzen G-Series APUs for workstation or HTPC use
Trade-offs
- Intel systems. This is an AMD-only socket and chipset.
- NVIDIA multi-GPU setups. Supports only AMD CrossFireX, not SLI.
- Large tower builds requiring full-size ATX. Micro-ATX form factor limits expansion slots and may not fit all cases.
- Built-in WiFi requirement. WiFi is optional via M.2 Key E module; not included by default.
- High-core-count Threadripper or HEDT workloads. B550 chipset and socket AM4 are designed for mainstream Ryzen, not workstation-class CPUs.
AMD AM4 socket supports Ryzen 3000, 3000 G-Series, 4000 G-Series, 5000 and 5000 G-Series processors. 8 power phase design, DDR4 up to 4733+ MHz overclocked, 1 PCIe 4.0 x16, 2 PCIe 3.0 x16, M.2 Key E for WiFi. HDMI, DisplayPort, D-Sub outputs. Realtek ALC1220 7.1 HD audio with Nahimic. AMD CrossFireX support. 6 SATA3, M.2 Gen4x4 and Gen3x2. 2 USB 3.2 Gen2, 8 USB 3.2 Gen1. Gigabit LAN.
Featuring sturdy components and completely smooth power delivery to the CPU. Plus, it offers unmatched overclocking capabilities and enhanced performance with the lowest temperature for advanced gamers as well. Compared to traditional chokes, ASRock's premium 50A power chokes effectively make the saturation current up to three times better, thus providing enhanced and improved Vcore voltage to the motherboard. 2 ounce copper inner layers that provide stable signal traces and power shapes! Delivering lower temperature and higher energy efficiency for overclocking, it's able to support the latest DDR4 memory modules with most extreme memory performance!
Conventional PC systems processor can only access a fraction of graphics memory and limits system performance. With AMD Smart Access Memory, the data channel gets expanded to harness the full potential of GPU memory, removes the bottleneck and increase performance.
The reinforced steel slot is capable of supporting PCI Express 4.0 standard. The various benefits include: ✔ Extra anchor points ✔ Stronger latch ✔ Ensure signal stability ✔ Make sure heavy graphics cards to be well-installed.
This motherboard features onboard RGB headers and an addressable RGB header that allow motherboard to be connected to compatible LED devices such as strip, CPU fans, coolers, chassis and so on. Users may also synchronize RGB LED devices across the Polychrome RGB Sync-certified accessories to create their own unique lighting effects. *The addressable RGB LED header supports WS2812B addressable RGB LED strip (5V/Data/GND), with a maximum power rating of 3A (5V), a max of 80 LEDs and length within 2 meters.
This motherboard has a pair of onboard Type-A and Type-C USB 3.2 Gen2 ports built on the rear i/o for supporting next generation USB 3.2 Gen2 devices and to deliver up to 10 Gbps data transfer rates. *Charge speed may vary due to controller protocol, please make sure your device can support 3.0A charging. Besides the onboard LAN port, users may also choose wireless connections by M.2 (Key E) slot.
An easy troubleshooting tool that shows the CPU / DRAM / VGA / BOOT operation every time you start up the system. Post Status Checker is a fast and easy way to identify the source of the problem.
General
| Brand | ASRock |
|---|---|
| Model | B550M Pro4 |
| Part Number | 90-MXBDK0-A0UAYZ |
Processor & Memory
| CPU Socket | AMD AM4 |
|---|---|
| Supported CPUs | Ryzen 3000, 3000 G-Series, 4000 G-Series, 5000 and 5000 G-Series |
| Memory Slots | 4 x DDR4 DIMM (288-pin), Dual Channel |
| Max Memory | 128 GB |
| Memory Speeds | DDR4 2133–4733+ MHz (OC) |
Expansion & Storage
| PCIe Slots | 1 x PCIe 4.0 x16, 1 x PCIe 3.0 x16, 1 x PCIe 3.0 x1 |
|---|---|
| SATA Ports | 6 x SATA3 |
| M.2 Slots | 1 x M.2 (PCIe Gen4 x4), 1 x M.2 (PCIe Gen3 x2 & SATA3), 1 x M.2 Key E (WiFi/BT) |
| Multi-GPU Support | AMD CrossFireX and Quad CrossFireX |
Connectivity & Audio
| Graphics Outputs | D-Sub, DisplayPort 1.4, HDMI 2.1 (up to 4K x 2K @ 60Hz) |
|---|---|
| USB (Rear) | 2 x USB 3.2 Gen2 (1 Type-A, 1 Type-C), 4 x USB 3.2 Gen1, 2 x USB 2.0 |
| USB (Front Headers) | 4 x USB 3.2 Gen1, 4 x USB 2.0 |
| LAN | Realtek Gigabit LAN (RTL8111H) |
| Audio Codec | Realtek ALC1220, 7.1 CH with Nahimic |
Power & Features
| Power Design | 8 Power Phase, 50A Power Chokes, 2oz Copper PCB |
|---|---|
| RGB Headers | Onboard RGB + addressable RGB (Polychrome RGB Sync), supports WS2812B strip up to 80 LEDs, 3A @ 5V |
| POST Status Checker | Onboard troubleshooting tool for CPU, DRAM, VGA, BOOT diagnosis |
| Smart Access Memory | AMD Smart Access Memory supported |
Shipping
All our products are shipped from the United Kingdom within 24 to 48 hours of purchase. See our Shipping and Returns page for full details.
Returns
- Tech Syndicate offers a full money-back guarantee on all purchases made in our store. If you are not satisfied with your purchase, we will provide a full refund, no questions asked.
- Refunds are available within 45 days of delivery.
- After the 45-day period you are no longer eligible for a refund, so we encourage you to try the product within the first few weeks to make sure it fits your needs.