# Motherboard ASRock B850 Pro RS — ATX, AMD B850, Socket AM5, DDR5, 4 DIMM, 256 GB, 2.5Gb LAN, M.2, SATA III

**URL:** https://aio.lv/en/product--asrock-90-mxbqk-a0uayz--11245387
**Data updated:** 2026-01-21 11:08 (EET)
**Category:** Motherboards
**Manufacturer:** ASROCK
**Manufacturer code:** 90-MXBQK-A0UAYZ
**EAN:** 4711581490161
**Warranty:** 3 Years
**Availability:** Available for order
**Price:** 156.49 €
**Prices and availability valid until:** 2026-08-09 23:59
**Price without VAT (21%):** 129.33 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--asrock-90-mxbqk-a0uayz--11245387

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 21.07.2026 | free |
| Pickup points | 24.07.2026 | 1.89 EUR |
| Courier delivery to door | 24.07.2026 | 4.99 EUR |

## Summary description

ASRock B850 Pro RS is an ATX motherboard for Socket AM5 processors (AMD Ryzen 7000 series) with AMD B850 chipset. Supports DDR5 memory up to 256 GB across 4 DIMM slots (dual-channel, ECC compatible). Features 1x PCIe Gen5 x16, 1x PCIe Gen4 x16, 1x M.2 slot, 4x SATA III, RAID 10, Realtek ALC897 7.1 audio, Dragon RTL8125BG 2.5Gb Ethernet, multiple USB ports and connectors for fans, TPM and RGB. Designed for desktop PC builds and upgrades; provides modern connectivity and storage options for gaming, content creation and general computing.

## Long description

Optimized for stability, durability and efficiency, this ASRock motherboard combines reliable performance, user-friendly features and a streamlined design for daily computing tasks. It supports high-current power delivery, advanced memory overclocking profiles and the latest PCIe 5.0 storage devices, making it suitable for demanding home and gaming systems.
Advantages
The Hi-Density Power Connector and 14+2+1 power phase design provide stable and sustained power for CPU overclocking while reducing thermal stress. Integrated Dr.MOS components and an 8-layer PCB improve power efficiency and thermal performance for both CPU and memory. Native DDR5 XMP/EXPO support enables easy memory overclocking via pre-tested profiles. PCIe Gen5 Blazing M.2 and a reinforced PCIe 5.0 steel slot deliver future-proof high-speed storage and secure GPU mounting. Additional features include an optimized aluminum heatsink, 2.5 Gb/s Dragon LAN for faster networking and Nahimic audio enhancements for clear communication and immersive sound.
Key specifications
Power design: Hi-Density Power Connector; 14+2+1 power phase
Power components: Dr.MOS integrated power stage
PCB layers: 8-layer PCB for stable signals and thermal control
Memory: DDR5 with Intel® XMP and AMD EXPO™ support
Storage: PCIe Gen5 Blazing M.2 (up to 128 Gb/s)
Expansion slot: Reinforced steel PCIe slot (PCIe 5.0 compatible)
Cooling: Optimized aluminum heatsink design
Networking: Dragon 2.5 Gb/s LAN
Audio: Nahimic audio engine with noise suppression, echo cancellation and voice stabilizer
RGB: Polychrome RGB and addressable RGB headers; SignalRGB support
How to use
Install the motherboard into a compatible case, secure it to standoffs and connect the Hi-Density CPU power connector(s) from a PSU rated to handle required current for overclocking. Install DDR5 memory modules that support Intel XMP or AMD EXPO and enable the desired pre-tested profile in firmware for stable overclocking. Fit PCIe Gen5 M.2 SSDs into the Blazing M.2 slot and attach graphics cards to the reinforced steel PCIe slot, ensuring latches and anchor points are engaged. Connect LAN, audio and RGB devices to their respective headers and configure Nahimic audio settings and Polychrome/SignalRGB lighting software as needed. Verify cooling is adequate and monitor temperatures during initial operation and when overclocking.
Recommendations
Use a high-quality power supply with sufficient current capacity when overclocking, ensure memory modules explicitly support XMP/EXPO profiles, and maintain good case airflow to benefit from the 8-layer PCB and aluminum heatsinks. Update firmware and drivers to the latest versions for best stability and compatibility.

## Specifications

### Features

| Feature | Value |
|---|---|
| Motherboard form factor | ATX |
| Motherboard chipset | AMD B850 |
| Component for | PC |
| Audio output channels | 7.1 |
| Windows operating systems supported | Windows 11 x64, Windows 10 x64 |
| Motherboard chipset family | AMD |

### 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 |
| Memory slots type | DIMM |
| ECC сompatibility | ECC |

### Expansion slots

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

### 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 | 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 III connectors | 4 |
| RGB LED pin header | Yes |
| USB 3.2 Gen 2x2 connectors | 1 |
| Number of CPU fan connectors | 2 |
| Number of EPS power connectors (8-pin) | 2 |

### Rear panel I/O ports

| Feature | Value |
|---|---|
| Line-in | Yes |
| USB 2.0 ports quantity | 6 |
| Ethernet LAN (RJ-45) ports | 1 |
| Microphone in | Yes |
| HDMI ports quantity | 1 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 4 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-C 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 |
| RAID support | Yes |
| Supported storage drive interfaces | M.2, SATA III |

### BIOS

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

### Weight & dimensions

| Feature | Value |
|---|---|
| Width | 305 mm |
| Depth | 244 mm |

### Other features

| Feature | Value |
|---|---|
| Audio chip | Realtek ALC897 |

### Packaging content

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

## FAQ

### How much does the ASRock B850 Pro RS motherboard (Socket AM5) cost, and is it available for purchase?

The price is 156.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 158 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 21.07.2026 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 B850 Pro RS motherboard (Socket AM5) 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/11245387/65439476_large.webp