# Motherboard Asrock B550M Pro4 AMD B550 Socket AM4 micro ATX

**URL:** https://aio.lv/en/product--asrock-90-mxbdk0-a0uayz--3504850
**Data updated:** 2026-02-17 11:44 (EET)
**Category:** Motherboards
**Manufacturer:** ASROCK
**Manufacturer code:** 90-MXBDK0-A0UAYZ
**EAN:** 4710483931598
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 105.99 €
**Prices and availability valid until:** 2026-07-28 23:59
**Price without VAT (21%):** 87.60 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--asrock-90-mxbdk0-a0uayz--3504850

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 13.07.2026 | free |
| Pickup points | 16.07.2026 | 1.89 EUR |
| Courier delivery to door | 16.07.2026 | 4.99 EUR |

## Summary description

The Asrock B550M Pro4 motherboard supports AMD Ryzen 3000 Series processors with Socket AM4. It features DDR4-SDRAM memory support with a maximum capacity of 128 GB across DIMM slots. The board offers M.2 and SATA III interfaces for HDD and SSD storage, and supports RAID levels 0, 1, and 10. With CrossFireX technology, it enables parallel processing and supports resolutions up to 5120 x 2880 pixels. The Gigabit Ethernet interface is powered by a Realtek RTL8111H LAN controller.

## Long description

The ASRock B550M Pro4 is a micro‑ATX motherboard for AMD Socket AM4 processors based on the AMD B550 chipset. It supports DDR4 memory up to 128 GB across four DIMM slots, dual M.2 storage (including Type 22110 NVMe) and multiple SATA III ports. The board includes reinforced PCIe slots, dual USB 3.2 Gen2 Type‑A and Type‑C on the rear I/O, Gigabit LAN and integrated audio with Nahimic enhancements for directional sound awareness.
Advantages
The board uses an 8‑phase power design with premium 50A power chokes and 2oz copper PCB layers to improve voltage delivery, thermal performance and stability for sustained workloads and overclocking. Dual M.2 slots (one Hyper M.2 supporting PCIe Gen4 x4 and one supporting PCIe Gen3/SATA) and M.2 armors provide high‑speed storage support and thermal protection. Onboard RGB and addressable RGB headers enable synchronized lighting, while reinforced steel PCIe slot and a Post Status Checker simplify installation and troubleshooting.
Suitable for
Desktop PC builders using AMD Ryzen processors (Socket AM4)
Mid‑range gaming systems with single GPU configurations
Workstations requiring fast NVMe storage and up to 128 GB DDR4 memory
Systems needing integrated RGB lighting control and Wi‑Fi module expansion (M.2 Key E)
Key specifications
Form factor: Micro ATX
Chipset: AMD B550
CPU socket: Socket AM4 (supports AMD Ryzen 3000 series and compatible CPUs)
Memory: 4× DIMM DDR4, up to 128 GB
Storage: Dual M.2 (one Type 22110, Hyper M.2 PCIe Gen4 x4; one PCIe Gen3 x2 / SATA3), multiple SATA III ports
Expansion slots: 1× PCIe x16 (reinforced), 1× PCIe x1
Rear I/O: Dual USB 3.2 Gen2 (Type‑A + Type‑C), Gigabit LAN (Realtek RTL8111H), audio with Nahimic
Additional: M.2 (Key E) slot for Wi‑Fi, Post Status Checker
How to use
Install the B550M Pro4 into a compatible micro‑ATX case and secure it to the standoffs. Fit an AM4 CPU and apply appropriate cooling, populate up to four DDR4 DIMMs according to the motherboard manual for optimal channel configuration, and install storage devices into M.2 sockets or SATA ports. Connect front panel, power, and peripheral headers, then attach any RGB devices to the onboard RGB or addressable RGB headers. For wireless networking, install an M.2 Key E Wi‑Fi module and attach antennas if required. Power on and enter BIOS to verify device detection, configure memory/XMP and storage modes, and update firmware if necessary.
Usage recommendations
Use quality power supplies and adequate chassis airflow to maximise stability and to keep VRM and M.2 temperatures low. When installing high‑performance NVMe drives, fit the M.2 armor or enable airflow over the slots. Follow the motherboard manual for correct memory slot population and PCIe device seating to avoid configuration issues.

## Specifications

### Features

| Feature | Value |
|---|---|
| Motherboard form factor | Micro ATX |
| Motherboard chipset | AMD B550 |
| Component for | PC |
| Certification | FCC, CE
ErP/EuP ready (ErP/EuP ready power supply is required) |
| Audio output channels | 7.1 |
| PC health monitoring | CPU, FAN, Temperature, Voltage |
| Windows operating systems supported | Windows 10 x64, Windows 11 x64 |
| Motherboard chipset family | AMD |

### Processor

| Feature | Value |
|---|---|
| Processor manufacturer | AMD |
| Maximum number of SMP processors | 1 |
| Processor socket | Socket AM4 |

### Memory

| Feature | Value |
|---|---|
| Number of memory slots | 4 |
| Maximum internal memory | 128 GB |
| Supported memory types | DDR4-SDRAM |
| Supported memory clock speeds | 2133, 2400, 2667, 2933, 3200, 3466, 3600, 3733, 3800, 3866, 4000, 4133, 4200, 4266, 4333, 4400, 4466, 4533, 4600, 4666, 4733 |
| Memory channels | Dual-channel |
| Unbuffered memory | Yes |
| Memory slots type | DIMM |
| Supported memory module capacities | 4GB, 8GB, 16GB, 32GB |
| Supported memory clock speed (max) | 4733 MHz |
| ECC сompatibility | ECC & non-ECC |

### Expansion slots

| Feature | Value |
|---|---|
| PCI Express x1 (Gen 3.x) slots | 1 |
| PCI Express x16 (Gen 3.x) slots | 1 |
| Number of M.2 (M) slots | 3 |
| PCI Express x16 (Gen 4.x) slots | 1 |

### Graphics

| Feature | Value |
|---|---|
| Maximum resolution | 5120 x 2880 |
| Parallel processing technology support | CrossFireX, Quad-GPU CrossFireX |
| DirectX version | 12.0 |
| HDCP | Yes |
| Number of displays supported | 3 |

### Network

| Feature | Value |
|---|---|
| Ethernet LAN | Yes |
| Wake-on-LAN ready | Yes |
| LAN controller | Realtek RTL8111H |
| Wi-Fi | No |
| Ethernet interface type | Gigabit Ethernet |

### Internal I/O

| Feature | Value |
|---|---|
| USB 2.0 connectors | 2 |
| CPU fan connector | Yes |
| Number of COM connectors | 1 |
| ATX Power connector (24-pin) | Yes |
| Number of chassis fan connectors | 4 |
| Front panel audio connector | Yes |
| TPM connector | Yes |
| EPS power connector (8-pin) | Yes |
| USB 3.2 Gen 1 (3.1 Gen 1) connectors | 2 |
| Number of SATA II connectors | 6 |
| Front panel connector | Yes |
| 12V power connector | Yes |
| RGB LED pin header | Yes |

### Rear panel I/O ports

| Feature | Value |
|---|---|
| PS/2 ports quantity | 1 |
| USB 2.0 ports quantity | 2 |
| Ethernet LAN (RJ-45) ports | 1 |
| Microphone in | Yes |
| VGA (D-Sub) ports quantity | 1 |
| HDMI ports quantity | 1 |
| HDMI version | 2.1 |
| DisplayPorts quantity | 1 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 4 |
| USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity | 1 |
| USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity | 1 |

### Storage controllers

| Feature | Value |
|---|---|
| RAID levels | 1, 10 |
| Supported storage drive types | HDD & SSD |
| RAID support | Yes |
| Supported storage drive interfaces | M.2, SATA III |

### BIOS

| Feature | Value |
|---|---|
| BIOS memory size | 256 Mbit |
| BIOS type | UEFI AMI |
| ACPI version | 5.1 |
| System Management BIOS (SMBIOS) version | 2.3 |

### Weight & dimensions

| Feature | Value |
|---|---|
| Width | 244 mm |
| Depth | 244 mm |

### Other features

| Feature | Value |
|---|---|
| Supported processor sockets | Socket AM4 |
| Weight | 0.465 kg |
| Height | 70 mm |
| DisplayPort version | 1.4 |
| Audio chip | Realtek ALC1200 |

### Packaging content

| Feature | Value |
|---|---|
| Cables included | SATA |
| Drivers included | Yes |

### Logistics data

| Feature | Value |
|---|---|
| Harmonized System (HS) code | 84733020 |

## FAQ

### How much does the Motherboard Asrock B550M Pro4, 90-MXBDK0-A0UAYZ cost, and is it available for purchase?

The price is 105.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 5 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 13.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can Motherboard Asrock B550M Pro4, 90-MXBDK0-A0UAYZ be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All ASROCK products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized ASROCK service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: motherboard form factor, motherboard chipset, component for, processor socket, number of memory slots, maximum internal memory, pci express x1 (gen 3.x) slots, pci express x16 (gen 3.x) slots, weight, supported memory types, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

### Where can I download the instructions for Motherboard Asrock B550M Pro4, 90-MXBDK0-A0UAYZ?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

https://aio.lv/img/cache/product/3504850/65417345_large.webp