# Motherboard Asrock B860M Pro-A Intel B860 LGA 1851 micro ATX

**URL:** https://aio.lv/en/product--asrock-90-mxbrr-a0uayz--11417090
**Data updated:** 2025-12-30 21:17 (EET)
**Category:** Motherboards
**Manufacturer:** ASROCK
**Manufacturer code:** 90-MXBRR-A0UAYZ
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 118.99 €
**Prices and availability valid until:** 2026-07-31 23:59
**Price without VAT (21%):** 98.34 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--asrock-90-mxbrr-a0uayz--11417090

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 15.07.2026 | free |
| Pickup points | 20.07.2026 | 1.89 EUR |
| Courier delivery to door | 20.07.2026 | 4.99 EUR |

## Summary description

The Asrock B860M Pro-A motherboard is designed for Intel processors with LGA 1851 socket, supporting Intel Core Ultra (Series 2). It features DDR5-SDRAM memory support with a maximum capacity of 256 GB across DIMM slots. Storage options include M.2 and SATA III interfaces for HDD and SSD drives, with RAID levels 0, 1, 5, and 10. The board also includes a 2.5 Gigabit Ethernet interface powered by the Dragon RTL8125BG LAN controller, making it suitable for high-performance PC builds.

## Long description

The ASRock B860M Pro-A is a micro ATX motherboard for Intel LGA 1851 processors, built to provide stable, durable and efficient daily computing. It supports DDR5 memory up to 256 GB across four DIMM slots, PCIe Gen5 M.2 storage, SATA III drives, RAID 0/1/5/10, and features a 2.5 Gb/s Dragon LAN for improved network throughput. The board includes modern connectivity such as USB 3.2 Gen2x2 Type-C and front-panel USB 3.2 Gen1 Type-C, reinforced PCIe slot construction, aluminum heatsinks and onboard RGB headers.
Advantages
The B860M Pro-A offers a 10+1+1 VRM power design with Dr.MOS components for stable CPU power delivery and efficient thermal behavior, a Hi-Density CPU power connector for overclocking stability, and a 6-layer PCB that improves signal integrity and memory overclocking potential. PCIe Gen5-compliant M.2 support and USB 3.2 Gen2x2 Type-C deliver high data transfer speeds, while the 2.5 Gb/s Dragon LAN increases network bandwidth for demanding tasks. Onboard and addressable RGB headers plus SignalRGB compatibility allow synchronized lighting control.
Suitable for
Home and office desktop builds requiring compact micro ATX form factor
Content creation and streaming with high network and storage bandwidth needs
Gaming systems that benefit from reinforced PCIe slot and improved power delivery
Systems using DDR5 memory and modern NVMe PCIe Gen5 SSDs
Key specifications
Form factor: Micro ATX
Chipset: Intel B860
CPU socket: LGA 1851 (Socket V1) — supports Intel Core Ultra (Series 2) and compatible processors
Memory: 4× DIMM, DDR5-SDRAM, up to 256 GB
Storage interfaces: PCIe Gen5 M.2, M.2 slots, SATA III, RAID 0/1/5/10
LAN: Dragon RTL8125BG 2.5 Gb/s Ethernet
USB: Rear USB 3.2 Gen2x2 Type-C (20 Gbps), front-panel USB 3.2 Gen1 Type-C (5 Gbps)
Expansion: Reinforced PCIe steel slot (PCIe 5.0 compatible)
How to use
Install the motherboard into a compatible micro ATX case and connect the LGA 1851 CPU, DDR5 memory modules, and storage devices following the motherboard manual for proper slot placement and orientation. Connect the Hi-Density CPU power connector and the ATX power connector from a compatible PSU. Use the provided M.2 and SATA connectors for SSDs/HDDs and configure RAID arrays through the BIOS if required. Install the operating system and then use the Auto Driver Installer utility to add network and chipset drivers; BIOS Flashback is available for updating BIOS using a USB drive without CPU or RAM installed.
Usage recommendations
For stable memory overclocking, enable pre-tested DDR5 XMP or AMD EXPO profiles only with compatible modules. Ensure a quality power supply and sufficient case cooling when running high loads or overclocking. Use the reinforced PCIe slot and secure heavy graphics cards with the case support to prevent stress on the board.

## Specifications

### Features

| Feature | Value |
|---|---|
| Motherboard form factor | Micro ATX |
| Motherboard chipset | Intel B860 |
| Component for | PC |
| Audio output channels | 7.1 |
| Windows operating systems supported | Windows 11 x64 |
| Motherboard chipset family | Intel |

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

### Processor

| Feature | Value |
|---|---|
| Processor manufacturer | Intel |
| Processor socket | LGA 1851 (Socket V1) |

### 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 |
| Supported memory clock speed (max) | 8666 MHz |
| ECC сompatibility | non-ECC |

### Expansion slots

| Feature | Value |
|---|---|
| Number of M.2 (M) slots | 1 |
| PCI Express x4 (Gen 4.x) slots | 1 |
| PCI Express x16 (Gen 5.x) slots | 1 |

### Graphics

| Feature | Value |
|---|---|
| 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 |
| Number of COM connectors | 1 |
| ATX Power connector (24-pin) | Yes |
| Number of chassis fan connectors | 3 |
| Front panel audio connector | Yes |
| TPM connector | Yes |
| USB 3.2 Gen 1 (3.1 Gen 1) connectors | 2 |
| Number of SATA III connectors | 4 |
| RGB LED pin header | Yes |
| 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 2.0 ports quantity | 2 |
| Ethernet LAN (RJ-45) ports | 1 |
| Microphone in | Yes |
| HDMI ports quantity | 1 |
| DisplayPorts quantity | 1 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 3 |
| USB 3.2 Gen 2x2 Type-C ports quantity | 1 |

### Storage controllers

| Feature | Value |
|---|---|
| RAID levels | 10, 5, 1 |
| Supported storage drive types | HDD & SSD |
| RAID support | Yes |
| Supported storage drive interfaces | SATA III, M.2 |

### 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 |
|---|---|
| DisplayPort version | 1.4 |
| Audio chip | Realtek ALC897 |

### Packaging content

| Feature | Value |
|---|---|
| Cables included | SATA |

## FAQ

### How much does the Motherboard Asrock B860M Pro-A, 90-MXBRR-A0UAYZ cost, and is it available for purchase?

The price is 118.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 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 15.07.2026 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 B860M Pro-A, 90-MXBRR-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, 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.

## Image

https://aio.lv/img/cache/product/11417090/66184717_large.webp