# Motherboard ASRock B850M Pro-A WiFi micro ATX – AMD B850, Socket AM5, DDR5, 4x DIMM, 256GB, Wi‑Fi, 2.5Gb LAN

**URL:** https://aio.lv/en/product--asrock-90-mxbr9-a0uayz--11247611
**Data updated:** 2026-01-21 11:08 (EET)
**Category:** Motherboards
**Manufacturer:** ASROCK
**Manufacturer code:** 90-MXBR9-A0UAYZ
**EAN:** 4711581490376
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 128.49 €
**Prices and availability valid until:** 2026-07-26 23:59
**Price without VAT (21%):** 106.19 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--asrock-90-mxbr9-a0uayz--11247611

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 10.07.2026 | free |
| Pickup points | 15.07.2026 | 1.89 EUR |
| Courier delivery to door | 15.07.2026 | 4.99 EUR |

## Summary description

ASRock B850M Pro-A WiFi is a micro ATX motherboard for Socket AM5 processors (AMD Ryzen 7000 series). It supports DDR5 memory up to 256 GB across 4 DIMM slots (dual-channel), PCIe 5.0 x16 and three M.2 slots (PCIe 5.0/4.0), SATA III and RAID 10. Integrated Wi‑Fi, Bluetooth 5.2, 2.5 Gb Ethernet, HDMI 2.1 and multiple USB ports provide connectivity for gaming, content creation and everyday PC builds.

## Long description

Optimized for stability, durability and efficiency, this ASRock motherboard combines reliable performance, user-friendly features and a streamlined style for daily computing tasks. The board implements an 8+2+1 power phase VRM design with Dr. MOS integrated power stages, Hi-Density CPU power connector and a 6-layer PCB to deliver smooth power delivery, improved thermal behavior and support for aggressive memory overclocking. It also supports DDR5 XMP and AMD EXPO profiles, multiple high-speed M.2 slots including a PCIe Gen5 Blazing M.2 and PCIe Gen4 Hyper M.2, plus onboard Wi‑Fi 6E and 2.5 Gb/s LAN for modern connectivity.
Advantages
The robust 8+2+1 VRM with Dr. MOS provides stable current to the CPU and better thermal performance compared with discrete MOSFET solutions. Hi‑Density power connectors increase reliability under high-current conditions such as CPU overclocking. A 6‑layer PCB enhances signal integrity and energy efficiency for memory overclocking. Native support for DDR5 XMP/EXPO enables easy activation of tested memory overclock profiles. High-speed storage options include a PCIe Gen5 M.2 for future ultrafast SSDs and PCIe Gen4 M.2 slots for current high-performance drives. Cooling features include optimized aluminum heatsinks, PWM/DC fan auto-detection and an intuitive fan-tuning utility. Connectivity is modern with Wi‑Fi 6E and Dragon 2.5 Gb/s LAN, while RGB headers and SignalRGB support provide customizable lighting. Practical features such as dual display outputs, reinforced PCIe slot and BIOS Flashback simplify building and maintenance.
Key specifications
 VRM: 8+2+1 power phase design with Dr. MOS
 Power connector: Hi‑Density CPU power connector
 PCB: 6-layer PCB
 Memory: DDR5 support with Intel XMP and AMD EXPO compatibility
 Storage: PCIe Gen5 Blazing M.2 and Hyper M.2 Gen4 x4 slots
 Cooling: Aluminum heatsinks; PWM/DC fan header support; Fan‑Tastic tuning utility
 Networking: Wi‑Fi 6E (802.11ax/e) and Dragon 2.5 Gb/s LAN
 RGB: Onboard RGB and addressable RGB headers; Polychrome RGB and SignalRGB support
 Graphics outputs: HDMI and DisplayPort
 Expansion slot: Reinforced steel PCIe slot (PCIe 5.0 compatible)
 Utilities: Auto driver installer (preinstalled LAN driver); BIOS Flashback (USB + power only)
How to use
Install the motherboard into a compatible chassis, connect the Hi‑Density CPU power connector and other required power cables, then mount CPU, cooler, memory modules and storage devices into the appropriate sockets and M.2 slots. Enable DDR5 XMP or AMD EXPO profiles in BIOS to apply pre‑tested memory overclock settings if the installed modules support them. Use the BIOS or ASRock A‑Tuning software to configure fan curves, leveraging PWM/DC auto‑detection and the Fan‑Tastic tuning feature for optimized cooling and acoustic balance. For network setup, enable Wi‑Fi 6E or connect via the Dragon 2.5 Gb/s LAN port. To update firmware without CPU or memory installed, use BIOS Flashback with a USB drive and power supply as instructed by the motherboard manual.
Recommendations
For stable overclocking and optimal performance, use compatible high-quality DDR5 memory modules that support Intel XMP or AMD EXPO, a capable CPU cooler matched to your workload, and a reliable high‑current PSU to take advantage of the Hi‑Density power connector and robust VRM design.

## Specifications

### Features

| Feature | Value |
|---|---|
| Motherboard form factor | Micro ATX |
| Motherboard chipset | AMD B850 |
| Component for | PC |
| Certification | FCC, CE, ErP/EuP |
| Audio output channels | 7.1 |
| Windows operating systems supported | Windows 11 x64, Windows 10 x64 |
| Motherboard chipset family | AMD |

| Feature | Value |
|---|---|
| Product colour | Black |

### Processor

| Feature | Value |
|---|---|
| Processor manufacturer | AMD |
| Processor socket | Socket AM5 |

### Memory

| Feature | Value |
|---|---|
| Number of memory slots | 4 |
| Maximum internal memory | 256 GB |
| Supported memory types | DDR5-SDRAM |
| Memory channels | Dual-channel |
| Unbuffered memory | Yes |
| Memory slots type | DIMM |
| ECC сompatibility | ECC & non-ECC |

### Expansion slots

| Feature | Value |
|---|---|
| Number of M.2 (M) slots | 3 |
| PCI Express x4 (Gen 4.x) slots | 1 |
| PCI Express x16 (Gen 5.x) slots | 1 |
| 1st M.2 largest key size | 2280 |
| 2nd M.2 largest key size | 2280 |
| 3rd M.2 largest key size | 2280 |
| 1st M.2 highest PCI Express generation | 5.0 |
| 2nd M.2 highest PCI Express generation | 4.0 |
| 3rd M.2 highest PCI Express generation | 4.0 |

### Graphics

| Feature | Value |
|---|---|
| Maximum resolution | 3840 x 2160 |
| Parallel processing technology support | Not supported |
| HDCP | Yes |

### Network

| Feature | Value |
|---|---|
| Bluetooth version | 5.2 |
| Ethernet LAN | Yes |
| Bluetooth | Yes |
| LAN controller | Dragon RTL8125BG |
| Wi-Fi | Yes |
| Ethernet interface type | 2.5 Gigabit Ethernet |
| Top Wi-Fi standard | Wi-Fi 6E (802.11ax) |

### Internal I/O

| Feature | Value |
|---|---|
| USB 2.0 connectors | 2 |
| CPU fan connector | Yes |
| ATX Power connector (24-pin) | Yes |
| Number of chassis fan connectors | 3 |
| Front panel audio connector | Yes |
| TPM connector | Yes |
| EPS power connector (8-pin) | Yes |
| USB 3.2 Gen 1 (3.1 Gen 1) connectors | 3 |
| Number of SATA III connectors | 4 |
| 12V power connector | Yes |
| RGB LED pin header | Yes |
| Number of RGB LED pin headers | 1 |
| Number of CPU fan connectors | 2 |
| Number of EPS power connectors (8-pin) | 1 |

### Rear panel I/O ports

| Feature | Value |
|---|---|
| Line-in | Yes |
| USB connector type | USB Type-C, USB Type-A |
| USB 2.0 ports quantity | 4 |
| Ethernet LAN (RJ-45) ports | 1 |
| Headphone outputs | 3 |
| Microphone in | Yes |
| WiFi-AP antenna jack | 2 |
| HDMI ports quantity | 1 |
| HDMI version | 2.1 |
| DisplayPorts quantity | 1 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 2 |
| 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 | 10, 1 |
| Supported storage drive types | HDD & SSD |
| RAID support | Yes |
| Number of storage drives supported | 7 |
| Supported storage drive interfaces | PCI Express 5.0, PCI Express 4.0, SATA III |

### BIOS

| Feature | Value |
|---|---|
| BIOS memory size | 256 Mbit |
| BIOS type | UEFI AMI |

### Weight & dimensions

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

### Other features

| Feature | Value |
|---|---|
| Supported processor sockets | Socket AM5 |
| Wi-Fi standards | 802.11g, 802.11b, 802.11a, Wi-Fi 6E (802.11ax), Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac), Wi-Fi 6 (802.11ax) |
| DisplayPort version | 1.4 |
| Audio chip | Realtek ALC897 |

### Packaging content

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

## FAQ

### How much does the ASRock B850M Pro-A WiFi micro ATX motherboard cost, and is it available for purchase?

The price is 128.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 57 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 10.07.2026 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 ASRock B850M Pro-A WiFi micro ATX motherboard 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, 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 ASRock B850M Pro-A WiFi micro ATX motherboard?

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/11247611/65439683_large.webp