ASROCK B850M PRO-A
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ASROCK B850M PRO-A
The ASROCK B850M PRO-A motherboard is built on the AMD B850 chipset for the AMD AM5 socket and features a compact mATX (Micro ATX) form factor. It supports AMD Ryzen 9000, 8000, and 7000 series processors, making it a versatile solution for modern builds. The board has four DDR5 memory slots with dual-channel mode support and overclocking up to 8000MHz via Intel XMP and AMD EXPO profiles. The six-layer PCB ensures stable signal and power delivery, contributing to lower temperatures and higher energy efficiency when overclocking memory.
AMD B850
Chipset
AMD AM5
Socket
mATX (Micro ATX)
Form factor
DDR5
Memory type
4×
Number of RAM slotsKey features of the ASROCK B850M PRO-A motherboard
- Support for AMD Ryzen 9000/8000/7000 series processors for AM5 socket with 8+2+1 phase Dr.MOS power delivery
- Support for DDR5 memory up to 8000+ MHz with Intel XMP and AMD EXPO profiles
- PCIe 5.0 x16 slot with steel reinforcement and a Blazing M.2 interface with 128Gb/s speeds
- Realtek 2.5G LAN chip with a transfer speed of 2.5Gbps
- Large aluminium heatsinks for effective heat dissipation from the power cascade
- Polychrome RGB lighting system with SignalRGB support and connectors for addressable LED strips
Power and cooling for stable operation
The motherboard uses an 8+2+1 phase power design with integrated Dr.MOS circuits, which replace traditional discrete MOSFETs and intelligently deliver higher current to each phase. The result is better thermal performance and higher overall performance, especially in demanding gaming situations or productivity tasks. Aluminium heatsinks efficiently dissipate heat from key components, ensuring system stability.
Expansion slots and modern storage
For graphics and expansion cards, there is one PCIe 5.0 x16 slot with steel reinforcement and one PCIe 4.0 x4 slot. The steel reinforcement provides additional anchor points, a stronger latch, and ensures signal stability even when installing heavy graphics cards. For storage, the board offers three M.2 slots – one Blazing M.2 with PCIe Gen5 x4 support, reaching transfer speeds of up to 128Gb/s, and two Hyper M.2 slots with PCIe Gen4 x4. For traditional storage, there are four SATA III ports. An M.2 Key E slot for Wi-Fi modules is also available.
Connectivity and graphics outputs
The rear I/O panel is equipped with a 2.5-gigabit Realtek Dragon LAN port, which provides up to 2.5× more bandwidth than standard gigabit Ethernet and ensures faster file transfers, smoother streaming, and a more stable gaming connection. The front connectors allow you to connect an additional USB 3.2 Gen1 Type-C port and four USB 3.2 Gen1 ports. For graphics outputs, DisplayPort 1.4 and HDMI 2.1 are available, covering the most common connection types for modern monitors. The audio output is handled by a Realtek ALC897 codec with support for 7.1-channel HD audio.
User features and RGB lighting
The board supports the BIOS Flashback function for easy firmware updates without needing to install a processor. The Auto Driver Installer function, pre-installed in the BIOS, enables automatic installation of all necessary drivers, even without an optical drive. Integrated RGB lighting and addressable RGB connectors allow you to connect and synchronise lighting accessories across the entire build.
Port layout
Storage
- Number of SATA III: 4
- Number of M.2: 3
- M.2 Slot - 1× M.2 PCIe NVMe Gen5
- M.2 Slot - 2× M.2 PCIe NVMe Gen4
- Features: RAID 0, RAID 1, RAID 10 for both SATA and M.2 NVMe
USB ports
- Internal USB 2.0: 4 (2 headers)
- Internal USB 3.2 Gen 1: 4 (2 headers)
- Internal USB-C 3.2 Gen 1: 1 (1 header)
- Rear USB 2.0: 4
- Rear USB 3.2 Gen 1: 2
- Rear USB 3.2 Gen 2 Type-A: 1
- Rear USB-C 3.2 Gen 2: 1
Graphics
- HDMI 2.1, DisplayPort 1.4
- Graphics outputs: 1× HDMI 2.1, 1× DisplayPort 1.4
- Maximum resolution: 3840×2160
Sound
- Number of channels: 7.1
- Rear connectors: 3× 3.5mm Jack
- Internal connectors: 1× Front Panel Audio
Other
- Rear: 1× BIOS Flashback button, 1× RJ-45 (LAN) 2.5Gbps
- Power: 1× 24pin ATX, 1× 8pin 12V, 1× 4pin 12V
- Cooling: 2× CPU FAN (4pin PWM), 3× Chassis FAN (4pin PWM)
- Internal: 1× SPI TPM, 1× RGB LED, 3× Addressable LED, 1× Power LED and Speaker
Choosing a motherboard
When choosing a motherboard (or mainboard), it is important to pay particular attention to the motherboard's socket type, format and chipset. These are the most important parameters and ensure the board's compatibility with the processor, expansion cards and other components. The specific socket determines the choice of a suitable processor, while the remaining connectors determine the choice of other components for your future computer.Specifications
Format & functions
Memory
Advanced parameters
Connectors
Compatibility
Colour
This product is not an independently functional unit and may require professional installation.
Specifications can be changed without notice. Images are for illustrative purposes only.
