ASRock B850M Pro A Socket AM5 DDR5 PCIe 5.0 2.5G LAN Motherboard
7559 EGP
- Part Number 90-MXBR80-A0UAYZ
- CPU Socket AM5 (Ryzen 9000 / 8000 / 7000 Series)
- Memory Support 4x DDR5 DIMM, up to 8000+(OC) MT/s (256GB Max)
- Primary Slots 1x PCIe 5.0 x16 & 1x Blazing M.2 (Gen5x4)
- Storage 3x M.2 Slots (1x Gen5, 2x Gen4) & 4x SATA 6Gb/s
- Networking Dragon 2.5GbE LAN
- Warranty 3 Years
ASRock B850M Pro-A: PCIe 5.0 AM5 Micro-ATX Powerhouse
In short, the ASRock B850M Pro-A technically facilitates a superior computing environment through its enhanced stability and industrial-grade efficiency. Notably, the architecture utilizes an 8+2+1 Power Phase design with Dr.MOS to effectively manage VCore+SOC+MISC telemetry. Specifically, the integration of PCIe Gen5 for both graphics and M.2 storage reinforces structural synchronization for next-gen builds near-instantaneously, ensuring your professional presence remains optimized under extreme workloads.
Furthermore, the Pro-A series is technically engineered for enhanced durability, blending a streamlined aesthetic with 2.5G Dragon LAN connectivity for high-velocity networking. Because the frame supports DDR5 memory up to 8000+(OC), it technically facilitates elite multitasking excursions without the latency compromises typical of entry-level boards. Consequently, you receive a visually perfect and rock-solid foundation for AMD Ryzen™ 9000, 8000, and 7000 series processors.
Superb Productivity & Thermal Synchronization
Blazing M.2 Storage Matrix
Alongside the PCIe 5.0 x16 slot is a Blazing M.2 socket technically engineered for 128 Gb/s throughput. This effectively ensures your storage iterations remain stable, specifically reducing bottlenecking for heavy NVMe workloads while protecting the thermal integrity of your AM5 system through optimized PCB trace synchronization.
EZ Update & Troubleshooter
Moreover, the integrated BIOS Flashback button technically facilitates near-instantaneous firmware updates without a CPU. This architecture ensures your hardware transitions remain clean and secure, while the ASRock Post Status Checker provides visual telemetry to effectively identify component issues during enthusiast builds.
💡 Pro-Builder Tip: Storage Configuration
To technically facilitate maximum Gen5 throughput, prioritize installation in the M2_1 slot for 128 Gb/s performance. Specifically, be aware that if the M2_3 socket is occupied, the PCIE2 slot will be disabled to effectively manage lane bandwidth. Furthermore, ensure you utilize the ASRock Auto Driver Installer to maintain signal stability across all 2.5G LAN and USB 3.2 Gen2 interfaces.
Technical Matrix
| Hardware Feature | Detailed Specification |
|---|---|
| Unique Feature | PCIe Gen5 (Graphics, M.2) | 8+2+1 Power Phase, Dr.MOS | 2.5G LAN | BIOS Flashback | Auto Driver Installer |
| CPU Support | AMD Socket AM5 Ryzen™ 9000, 8000 and 7000 Series Processors |
| Chipset | AMD B850 |
| Memory | 4 x DDR5 DIMM | Dual Channel | Supports ECC/non-ECC up to 8000+(OC) | Max 256GB | XMP & EXPO Support |
| BIOS | 256Mb AMI UEFI Legal BIOS with GUI support |
| Graphics | 1 x HDMI 2.1 (4K 120Hz) | 1 x DisplayPort 1.4 with DSC (4K 120Hz) |
| Audio | 7.1 CH HD Audio (Realtek ALC897 Audio Codec) |
| LAN | 2.5 Gigabit LAN (Dragon RTL8125BG) | Smart Auto Adjust Bandwidth |
| Expansion Slots | 1 x PCIe 5.0 x16 | 1 x PCIe 4.0 x4 | 1 x M.2 Socket (Key E) for WiFi/BT |
| Storage | 1 x Blazing M.2 (Gen5x4) | 2 x Hyper M.2 (Gen4x4) | 4 x SATA3 6.0 Gb/s |
| RAID | Supports RAID 0, 1, 10 for SATA & M.2 NVMe |
| USB | 1 x USB 3.2 Gen2 Type-C (Rear) | 1 x USB 3.2 Gen2 Type-A | 7 x USB 3.2 Gen1 | 8 x USB 2.0 |
| Rear I/O Panel | HDMI, DP 1.4, USB 3.2 Gen2 (A+C), 2 x USB 3.2 Gen1, 4 x USB 2.0, RJ-45, Flashback Button, Audio Jacks |
| Form Factor | Micro ATX: 9.6-in x 9.6-in (24.4 cm x 24.4 cm) |
| Model Name | B850M Pro-A |
| Part Number | 90-MXBR80-A0UAYZ |
| SKU | 90-MXBR80-A0UAYZ |
| UPC | N/A |
| EAN | 4711581490390 |
| Warranty | 3 Years Local Warranty |
What’s In The Box
Frequently Asked Questions
Does this motherboard support the new Ryzen 9000 Series?
Specifically, the B850M Pro-A technically facilitates support for AM5 Ryzen™ 9000, 8000, and 7000 Series processors. Notably, with the integrated BIOS Flashback button, you can update the board’s firmware near-instantaneously to ensure industrial-grade compatibility with the latest hardware iterations.
What is the benefit of the 2.5G Dragon LAN?
The Dragon RTL8125BG technically facilitates 2.5X the speed of standard Gigabit ethernet. Furthermore, the included software effectively ensures your gaming and streaming modes receive visual bandwidth priority. Therefore, you can execute elite-tier online excursions while maintaining structural synchronization with your high-speed internet plan.
*ASRock, Pro Series, and the ASRock logo are registered trademarks of ASRock Inc. AMD, Ryzen, and Radeon are trademarks of Advanced Micro Devices, Inc. Technical specifications are based on official documentation (Rev. 2026).
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| MODEL | |
|---|---|
| CHIPSET MANUFACTURERS | |
| CPU Socket | |
| Motherboard Chipset | |
| Motherboard Type | |
| CPU SERIES | AMD Ryzen 7000 Series & Ryzen 8000 & Ryzen 9000 Series Processors |
| Technology | |
| Memory Speed | |
| Max Memory Size | |
| Memory Slot | |
| PCI-E X16 | |
| PCI-E GEN | PCIe 5.0 |
| PCI-E Slots (M.2) | |
| SATAIII | |
| Communication module | |
| Part Number | |
| Warranty |
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