# Motherboard ASRock B850M Pro RS — AMD B850, Socket AM5, microATX, DDR5, 4 DIMM, 256GB, 3×M.2, PCIe 5.0 x16, 2.5Gb LAN, HDMI 2.1

**URL:** https://aio.lv/en/product--asrock-90-mxbr6-a0uayz--11245388
**Data updated:** 2026-01-21 11:08 (EET)
**Category:** Motherboards
**Manufacturer:** ASROCK
**Manufacturer code:** 90-MXBR6-A0UAYZ
**EAN:** 4711581490345
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 127.99 €
**Prices and availability valid until:** 2026-07-26 23:59
**Price without VAT (21%):** 105.78 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--asrock-90-mxbr6-a0uayz--11245388

## 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 RS is a microATX motherboard for Socket AM5 supporting AMD Ryzen 7000 series. It features the AMD B850 chipset, four DDR5 DIMM slots (up to 256 GB, dual-channel), three M.2 slots (one PCIe 5.0), one PCIe 5.0 x16 slot, SATA III and RAID support, Realtek ALC897 7.1 audio, HDMI 2.1 and DisplayPort 1.4, plus 2.5Gb Ethernet (Dragon RTL8125BG). Ideal for compact gaming and productivity PCs.

## Long description

The ASRock B850M Pro RS (Socket AM5, micro ATX) is a motherboard engineered for stable daily computing and enthusiast desktop builds. Compatible with AMD Ryzen 7000, 8000 and 9000 series processors, the board supports DDR5 memory up to 256 GB across four DIMM slots, modern storage interfaces including PCIe Gen5 M.2 and PCIe Gen4 M.2, SATA III and versatile USB connectivity. Its design emphasizes robust power delivery, cooling and expandability for sustained performance.
Advantages
The motherboard features an 8+2+1 power phase VRM with Dr.MOS integrated power stages and ASRock Hi-Density power connectors to provide smoother, higher-current delivery for CPU overclocking and reliable operation under load. A 6-layer PCB improves signal integrity and thermal behaviour for memory overclocking. Storage performance is addressed with a PCIe Gen5 Blazing M.2 slot and Hyper M.2 Gen4 x4 support. Cooling and noise control are enhanced by aluminum heatsinks, PWM/DC fan headers with auto-detection and ASRock Fan-Tastic tuning. Networking and audio are covered by Dragon 2.5 Gb/s LAN and Nahimic audio technologies, while onboard and addressable RGB headers plus SignalRGB support provide customizable lighting. The board also includes reinforced PCIe steel slot(s), dual graphics outputs (HDMI + DisplayPort) and a pre-installed I/O shield for easier installation.
Suitable for
Home and office desktop PCs requiring stable everyday performance
Mid-range to enthusiast gaming systems with Ryzen AM5 CPUs
Content creation and streaming setups needing fast storage and 2.5 GbE networking
Systems with DDR5 memory and moderate overclocking
Compact micro ATX builds that require multiple modern I/O options
Key specifications
Form factor: Micro ATX
Chipset: AMD B850
CPU socket: Socket AM5 (supports Ryzen 7000/8000/9000 series)
Memory: 4× DIMM, DDR5 up to 256 GB, XMP & EXPO profiles supported
Power design: 8+2+1 VRM with Dr.MOS and Hi-Density power connector
PCB: 6-layer PCB
Storage: PCIe Gen5 M.2 (Blazing M.2), PCIe Gen4 M.2 (Hyper M.2 Gen4 x4), SATA III
LAN: Dragon 2.5 Gb/s LAN
Audio: Nahimic audio technologies
Expansion: Reinforced steel PCIe slot (PCIe 5.0 ready), dual graphics outputs (HDMI + DisplayPort)
Other: Onboard and addressable RGB headers, SignalRGB support, pre-installed I/O shield
How to use
Install the ASRock B850M Pro RS into a compatible micro ATX chassis and connect the Socket AM5 CPU, DDR5 memory modules, storage devices and power supply following the motherboard manual. Use the Hi-Density CPU power connector and ensure correct seating of Dr.MOS-equipped VRM components. For NVMe SSDs, install into the designated M.2 slots and attach the M.2 heatsink if provided to improve thermal performance. Connect case fans to the PWM/DC headers and configure fan curves via the BIOS or ASRock A-Tuning Fan-Tastic Tuning utility. To enable memory overclocking profiles, activate Intel XMP or AMD EXPO in BIOS if your modules support them. Update BIOS using the EZ flash method when necessary to ensure CPU and memory compatibility.
Usage recommendations
For stable overclocking and long-term reliability, use a high-quality power supply, ensure adequate case airflow and keep NVMe drives cooled with the provided M.2 heatsink. Verify that memory modules support XMP or EXPO profiles before enabling overclocking in BIOS. Regularly update the BIOS and drivers from ASRock to maintain compatibility and performance.

## 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 |
|---|---|
| Ethernet LAN | Yes |
| LAN controller | Dragon RTL8125BG |
| Wi-Fi | No |
| Ethernet interface type | 2.5 Gigabit Ethernet |

### 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 |
| 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 | 1, 10 |
| Supported storage drive types | HDD & SSD |
| RAID support | Yes |
| Number of storage drives supported | 7 |
| Supported storage drive interfaces | PCI Express 4.0, PCI Express 5.0, 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 |
| DisplayPort version | 1.4 |
| Audio chip | Realtek ALC897 |

### Packaging content

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

## FAQ

### How much does the ASRock B850M Pro RS microATX Socket AM5 motherboard cost, and is it available for purchase?

The price is 127.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 112 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 RS microATX Socket AM5 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 RS microATX Socket AM5 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/11245388/65439496_large.webp