# Motherboard ASUS PRIME B850M-A-CSM AMD B850 Socket AM5 micro ATX DDR5

**URL:** https://aio.lv/en/product--asus-90mb1lq0-m0eayc--11456553
**Data updated:** 2025-12-30 21:23 (EET)
**Category:** Motherboards
**Manufacturer:** Asus
**Manufacturer code:** 90MB1LQ0-M0EAYC
**EAN:** 4711636054706
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 195.99 €
**Prices and availability valid until:** 2026-08-02 23:59
**Price without VAT (21%):** 161.98 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--asus-90mb1lq0-m0eayc--11456553

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 20.07.2026 | free |
| Pickup points | 23.07.2026 | 1.89 EUR |
| Courier delivery to door | 23.07.2026 | 4.99 EUR |

## Summary description

The ASUS PRIME B850M-A-CSM is a micro ATX motherboard designed for AMD processors, supporting Ryzen 7000, 8000, and 9000 series. It features DDR5 memory support with a maximum capacity of 256 GB, multiple PCIe interfaces for storage, and advanced RAID configurations. Ideal for high-resolution displays up to 7680 x 4320 pixels and equipped with 2.5 Gigabit Ethernet for fast connectivity.

## Long description

The ASUS PRIME B850M-A-CSM is a micro‑ATX motherboard for Socket AM5 systems, engineered for AMD Ryzen™ 7000, 8000 and 9000 series processors. It supports DDR5 memory (up to 256 GB across 4 slots), multiple PCIe interfaces including a PCIe 5.0-capable M.2 slot, and integrated 2.5 Gb Ethernet. Built for corporate and DIY use, the board is part of the ASUS Corporate Stable Model (CSM) program and includes ASUS Control Center Express for centralized IT management.
Advantages
The PRIME B850M-A-CSM combines a robust 8+2+1 digital power design with multi-layer PCB cooling to deliver stable power and improved thermal performance for everyday and demanding workloads. It offers enhanced DDR5 tuning (AEMP and EXPO support), three M.2 slots with up to one PCIe 5.0 lane for faster storage, extensive fan and thermal control via Fan Xpert 2+, and comprehensive connectivity including front-panel USB Type-C and Realtek 2.5 Gb Ethernet. Commercial features include a 36-month product lifecycle support and ASUS Control Center Express for IT deployment and endpoint management.
Suitable for
Office and corporate desktops requiring stable lifecycle support and remote IT management
Home and small-business workstations for content creation and productivity
Enthusiast and DIY builds that need DDR5 performance and PCIe 5.0 storage support
Systems requiring multiple NVMe drives and compact micro‑ATX form factor
Key specifications
Form factor: Micro ATX
Chipset: AMD B850
CPU socket: AM5 (supports AMD Ryzen 7000/8000/9000 series)
Memory: 4 × DDR5 slots, up to 256 GB
M.2: Three M.2 slots (one with PCIe 5.0 up to 128 Gbps, two with PCIe 4.0)
LAN: Realtek 2.5 Gb Ethernet
Front I/O: USB 5Gbps Type‑C connector
Power design: 8+2+1 phase digital VRM (Digi+)
Special features: Pre-mounted I/O shield, BIOS FlashBack™, SafeSlot, Q-LED Core
How to use
Install the motherboard into a compatible micro‑ATX chassis and populate the AM5 CPU, DDR5 memory modules (observe recommended slot population), GPU and storage devices according to the manual. Connect power, front-panel headers and cooling fans, then use the UEFI BIOS or ASUS AI Advisor for initial configuration and performance tuning. For BIOS updates without CPU or memory installed, use BIOS FlashBack™: copy the approved BIOS file to a FAT32 USB stick, insert into the FlashBack™ port and press the button.
Usage recommendations
For stable corporate deployments, register and deploy ASUS Control Center Express to automate BIOS and software updates during off‑peak hours, and group endpoints for secure configuration management. Use recommended DDR5 modules with EXPO or allow AEMP to optimize non‑EXPO kits for reliable system performance.

## Specifications

### Features

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

| Feature | Value |
|---|---|
| Product colour | Grey |

### 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 |
| Supported memory clock speed (max) | 8000 MHz |
| Maximum internal memory per slot | 64 GB |
| ECC сompatibility | ECC & non-ECC |

### Expansion slots

| Feature | Value |
|---|---|
| Number of M.2 (M) slots | 3 |
| PCI Express x16 (Gen 4.x) slots | 2 |
| 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 |
| 4th 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 |
| 4th M.2 highest PCI Express generation | 4.0 |

### Graphics

| Feature | Value |
|---|---|
| Maximum resolution | 7680 x 4320 |
| Parallel processing technology support | Not supported |

### Network

| Feature | Value |
|---|---|
| Ethernet LAN | Yes |
| Wi-Fi | No |
| Ethernet interface type | 2.5 Gigabit Ethernet |

### Internal I/O

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

### Rear panel I/O ports

| Feature | Value |
|---|---|
| Line-in | Yes |
| USB 2.0 ports quantity | 4 |
| Ethernet LAN (RJ-45) ports | 1 |
| Headphone outputs | 1 |
| Microphone in | Yes |
| HDMI ports quantity | 1 |
| HDMI version | 2.1 |
| DisplayPorts quantity | 2 |
| 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 | 2 |

### Storage controllers

| Feature | Value |
|---|---|
| RAID levels | 1, 5, 10 |
| 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 |

### 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 |
|---|---|
| Number of HDDs supported | 4 |
| Supported processor sockets | Socket AM5 |
| Package weight | 1450 g |
| DisplayPort version | 1.4 |

### Packaging content

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

### Packaging data

| Feature | Value |
|---|---|
| Package depth | 275 mm |
| Package height | 67.5 mm |
| Package width | 275 mm |

## FAQ

### How much does the Motherboard ASUS PRIME B850M-A-CSM cost, and is it available for purchase?

The price is 195.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 81 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 20.07.2026 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 ASUS PRIME B850M-A-CSM 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 Asus 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 Asus 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 Motherboard ASUS PRIME B850M-A-CSM?

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/11456553/66138881_large.webp