Tired of unstable builds and constant overheating? The Asrock B850 Pro-A 256GB Socket AM5 DDR5 ATX Motherboard gives you a solid foundation for Ryzen 7000-9000 CPUs, delivering reliable power and modern connectivity so you can focus on work or play without worrying about crashes.
Key Features of a 256GB Motherboard
- 14+2+1 Power Phase Design: smooth, stable power delivery for high-performance CPUs.
- Dr.MOS Power Stage: higher current per phase for better thermal performance and efficiency.
- Hi-Density Power Connector: handles heavy overclocking currents safely, reducing fire risk.
- 8-Layer PCB: keeps signal integrity high and temperatures low, ideal for memory overclocking.
- DDR5 XMP & EXPO Support: enables easy, pre-tested memory boosts for faster system response.
- PCIe Gen5 Blazing M.2: up to 128 Gb/s bandwidth, ready for the fastest SSDs.
- Hyper M.2 Gen4 x4: double the speed of previous generations for rapid data transfers.
- Aluminum Heatsink: dissipates heat efficiently, maintaining stability under load.
- Dragon 2.5 Gb/s LAN: up to 2.5× faster network speeds for gaming and large file transfers.
- USB 3.2 Gen2x2 Type-C: 20 Gbps transfer rate with reversible connector for modern peripherals.
Why Choose an Asrock Motherboard
If you’re building a new PC for gaming, content creation or demanding office work, you need a board that won’t limit your CPU or memory potential. Many builders struggle with inadequate power delivery, poor cooling or lack of future-proof slots. This motherboard’s robust VRM, advanced cooling and extensive PCIe and USB options remove those bottlenecks, letting you get the most out of your Ryzen processor and DDR5 memory.
Benefits of Asrock Motherboard
- Stable Power: 14+2+1 phases keep the CPU running smoothly even under heavy loads.
- Cool Operation: aluminium heatsink and 8-layer design maintain low temperatures.
- Fast Storage: PCIe 5.0 and Gen4 M.2 slots deliver ultra-quick load times.
- Future-Ready Networking: 2.5 Gb Ethernet ensures speedy online experiences.
- Easy Customisation: RGB headers and Polychrome support let you personalise the look.
Usages of a 256GB Motherboard
This motherboard is perfect for high-end gaming rigs, professional video editing workstations and power-efficient home PCs. Its strong VRM and cooling suit overclocked Ryzen CPUs, while the PCIe 5.0 and fast USB ports cater to creators who need rapid data movement and reliable network performance.
Specifications
| Processor |
| Supported processor sockets | Socket AM5 |
| Compatible processor series | AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series |
| Processor socket | Socket AM5 |
| Processor manufacturer | AMD |
| Memory |
| Unbuffered memory | Yes |
| Maximum internal memory | 256 GB |
| ECC сompatibility | ECC & Non-ECC |
| Memory channels | Dual-channel |
| Memory slots type | DIMM |
| Number of memory slots | 4 |
| Supported memory types | DDR5-SDRAM |
| Storage controllers |
| RAID levels | 0, 1, 10 |
| RAID support | Yes |
| Number of storage drives supported | 8 |
| Supported storage drive interfaces | PCI Express 3.0, PCI Express 4.0, PCI Express 5.0, SATA III |
| Supported storage drive types | HDD & SSD |
| Graphics |
| HDCP | Yes |
| Maximum resolution | 3840 x 2160 pixels |
| Parallel processing technology support | Not supported |
| Internal I/O |
| Number of RGB LED pin headers | 4 |
| RGB LED pin header | Yes |
| 12V power connector | Yes |
| Number of water pump connectors | 1 |
| TPM connector | Yes |
| Number of EPS power connectors (8-pin) | 2 |
| EPS power connector (8-pin) | Yes |
| Number of chassis fan connectors | 4 |
| Number of CPU fan connectors | 2 |
| CPU fan connector | Yes |
| ATX Power connector (24-pin) | Yes |
| Front panel audio connector | Yes |
| Number of SATA III connectors | 4 |
| USB 3.2 Gen 2x2 connectors | 1 |
| USB 3.2 Gen 2 (3.1 Gen 2) connectors | 0 |
| USB 3.2 Gen 1 (3.1 Gen 1) connectors | 1 |
| USB 2.0 connectors | 2 |
| Rear panel I/O ports |
| USB connector type | USB Type-A, USB Type-C |
| Microphone in | Yes |
| Headphone outputs | 3 |
| Line-in | Yes |
| DVI-D ports quantity | 0 |
| HDMI version | 2.1 |
| HDMI ports quantity | 1 |
| VGA (D-Sub) ports quantity | 0 |
| Ethernet LAN (RJ-45) ports | 1 |
| USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity | 1 |
| USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity | 0 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-C ports quantity | 1 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 4 |
| USB 2.0 ports quantity | 6 |
| Network |
| Wi-Fi | No |
| LAN controller | Dragon RTL8125BG |
| Ethernet interface type | 2.5 Gigabit Ethernet |
| Ethernet LAN | Yes |
| Features |
| Certification | FCC, CE, ErP/EuP |
| Windows operating systems supported | Windows 10 x64, Windows 11 x64 |
| Product colour | Black |
| Audio output channels | 7.1 channels |
| Audio chip | Realtek ALC897 |
| Motherboard chipset | AMD B850 |
| Motherboard chipset family | AMD |
| Motherboard form factor | ATX |
| Component for | PC |
| Expansion slots |
| 4th M.2 highest PCI Express generation | 3.0 |
| 4th M.2 largest key size | 2280 |
| 3rd M.2 highest PCI Express generation | 4.0 |
| 3rd M.2 largest key size | 2280 |
| 2nd M.2 highest PCI Express generation | 4.0 |
| 2nd M.2 largest key size | 2280 |
| 1st M.2 highest PCI Express generation | 5.0 |
| 1st M.2 largest key size | 2280 |
| Number of M.2 (M) slots | 4 |
| PCI Express x16 (Gen 5.x) slots | 1 |
| PCI Express x16 (Gen 4.x) slots | 1 |
| BIOS |
| BIOS memory size | 256 Mbit |
| BIOS type | UEFI AMI |
| Weight & dimensions |
| Depth | 244 mm |
| Width | 305 mm |
| Packaging content |
| Cables included | SATA |
| Screws included | Yes |
| Other features |
| Maximum internal memory | 256 GB |
| Summary Details |
| Compatible processor series | AMD Ryzen 7000 Series |
| Supported storage drive interfaces | PCI Express 3.0 |
| RAID levels | 0 |
| USB connector type | USB Type-A |
