Asrock B850M Pro RS AM5 micro ATX
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About This Item
- AMD B850 chipset with Socket AM5 for Ryzen 7000/8000/9000 CPUs
- Micro ATX form factor with 4 DIMM DDR5 slots supporting up to 256GB
- 3 M.2 slots (1x PCIe 5.0, 2x PCIe 4.0) plus 4 SATA III ports
- 8+2+1 power phase design with Dr. MOS for enhanced CPU performance
- 2.5Gb LAN, 7.1 audio, HDMI 2.1, DisplayPort 1.4, USB Type-A/C
1-3 Days
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ASRock B850M Pro RS | AMD B850 micro ATX Motherboard
The Asrock B850M Pro RS AMD B850 Socket AM5 micro ATX motherboard delivers robust performance for AMD Ryzen 7000/8000/9000 Series processors. This micro ATX board combines reliable power delivery, comprehensive connectivity, and user-friendly features in a compact form factor ideal for mainstream and enthusiast builds.
Slim Specs Table
| Metric | Spec |
|---|---|
| Form Factor | micro ATX (244 x 244 mm) |
| Socket | Socket AM5 |
| Memory Support | DDR5, up to 256GB |
| PCIe Slots | 1x PCIe 5.0 x16, 1x PCIe 4.0 x4 |
| LAN | 2.5Gb Ethernet |
Optimized Power Delivery for Stable Performance
The B850M Pro RS features an 8+2+1 power phase design with Dr. MOS technology, delivering clean, stable power to your CPU even under heavy loads. The Hi-Density Power Connectors are engineered to handle higher currents than standard connectors, reducing the risk of overheating during intensive overclocking sessions. This robust power delivery system ensures your AMD Ryzen processor performs consistently whether you’re gaming, streaming, or tackling demanding productivity tasks.
High-Speed Storage and Memory Solutions
This motherboard supports the latest storage technologies with three M.2 slots – one PCIe 5.0 capable for next-generation SSDs offering up to 128GB/s transfer speeds, and two PCIe 4.0 slots for high-performance storage options. The 6-layer PCB design provides superior signal integrity and thermal management, allowing for stable memory overclocking with DDR5 modules up to 256GB. ASRock’s XMP/EXPO support makes memory tuning straightforward with pre-tested profiles that unlock your RAM’s full potential without complex manual adjustments.
Intelligent Cooling and DIY-Friendly Design
Efficient thermal management comes from the aluminum heatsink design that effectively dissipates heat from critical components. The motherboard includes comprehensive fan support with PWM/DC detection, allowing automatic adjustment of fan curves for optimal cooling and noise reduction. ASRock’s Fan-Tastic Tuning feature simplifies setup by automatically detecting minimum fan duty cycles. The reinforced PCIe 5.0 steel slot provides extra security for heavy graphics cards, while the pre-installed I/O shield and EZ Setting utilities make assembly straightforward even for first-time builders.
Box contents
- ASRock B850M Pro RS motherboard
- SATA cables
- Screws
- I/O shield (pre-installed)
Check before you buy
- Confirm your AMD Ryzen processor is compatible with Socket AM5
- Verify your case supports micro ATX form factor (244 x 244 mm)
- Check that your DDR5 memory modules are compatible with this board
- Confirm you have adequate cooling for your specific CPU and usage scenario
Frequently Asked Questions
Q: Does this motherboard support Wi-Fi?
A: No, the B850M Pro RS does not include built-in Wi-Fi. It features 2.5Gb Ethernet for wired connectivity.
Q: What graphics outputs are available?
A: The motherboard provides one HDMI 2.1 port and one DisplayPort 1.4 for flexible multi-monitor setups.
Q: Can I use ECC memory with this motherboard?
A: Yes, the B850M Pro RS supports both ECC and non-ECC DDR5 memory modules.
Q: How many M.2 SSDs can I install?
A: You can install up to three M.2 SSDs – one PCIe 5.0 and two PCIe 4.0 drives.
Q: What RAID configurations are supported?
A: The motherboard supports RAID 0, RAID 1, and RAID 10 configurations for both SATA and M.2 storage.
The Consultant’s verdict & warranty
The Asrock B850M Pro RS AMD B850 Socket AM5 micro ATX motherboard offers excellent value for users building systems with AMD’s latest Ryzen processors. Its combination of robust power delivery, high-speed storage options, and comprehensive connectivity makes it suitable for both gaming and productivity applications. The compact micro ATX form factor provides flexibility for various case sizes while maintaining feature parity with larger boards. Covered by the standard Manufacturer Warranty.
| Internal I/O | |
|---|---|
| Number of M.2 (M) slots | 3 |
| 12V power connector | Yes |
| Supported storage drive interfaces | PCI Express 4.0, PCI Express 5.0, SATA III |
| USB 2.0 connectors | 2 |
| USB 3.2 Gen 1 (3.1 Gen 1) connectors | 3 |
| TPM connector | Yes |
| Number of SATA III connectors | 4 |
| Number of chassis fan connectors | 3 |
| Front panel audio connector | Yes |
| EPS power connector (8-pin) | Yes |
| CPU fan connector | Yes |
| ATX Power connector (24-pin) | Yes |
| RGB LED pin header | Yes |
| Number of CPU fan connectors | 2 |
| Number of EPS power connectors (8-pin) | 1 |
| Number of RGB LED pin headers | 1 |
| Technical details | |
| Motherboard chipset family | AMD |
| Motherboard chipset | AMD B850 |
| Supported processor sockets | Socket AM5 |
| Parallel processing technology support | Not supported |
| HDMI version | 2.1 |
| Motherboard form factor | micro ATX |
| Component for | PC |
| Audio | |
| Audio output channels | 7.1 channels |
| Performance | |
| Supported storage drive types | HDD & SSD |
| Windows operating systems supported | Windows 10 x64, Windows 11 x64 |
| Motherboard chipset family | AMD |
| Motherboard chipset | AMD B850 |
| RAID levels | 0, 1, 10 |
| Supported processor sockets | Socket AM5 |
| Certification | FCC, CE, ErP/EuP |
| Audio output channels | 7.1 channels |
| Motherboard form factor | micro ATX |
| Component for | PC |
| Processor | |
| Processor manufacturer | AMD |
| Compatible processor series | AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series |
| Supported processor sockets | Socket AM5 |
| Processor socket | Socket AM5 |
| Memory | |
| Number of memory slots | 4 |
| Memory slots type | DIMM |
| Supported memory types | DDR5-SDRAM |
| Memory channels | Dual-channel |
| Maximum internal memory | 256 GB |
| Unbuffered memory | Yes |
| ECC сompatibility | ECC & Non-ECC |
| Storage controllers | |
| Supported storage drive types | HDD & SSD |
| Supported storage drive interfaces | PCI Express 4.0, PCI Express 5.0, SATA III |
| RAID levels | 0, 1, 10 |
| Number of storage drives supported | 7 |
| RAID support | Yes |
| Graphics | |
| Parallel processing technology support | Not supported |
| Maximum resolution | 3840 x 2160 pixels |
| HDCP | Yes |
| Rear panel I/O ports | |
| 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 | 1 |
| USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity | 1 |
| DisplayPort version | 1.4 |
| USB connector type | USB Type-A, USB Type-C |
| USB 2.0 ports quantity | 4 |
| Microphone in | Yes |
| Headphone outputs | 3 |
| HDMI version | 2.1 |
| HDMI ports quantity | 1 |
| Ethernet LAN (RJ-45) ports | 1 |
| DisplayPorts quantity | 1 |
| Line-in | Yes |
| Network | |
| Ethernet LAN | Yes |
| Wi-Fi | No |
| LAN controller | Dragon RTL8125BG |
| Ethernet interface type | 2.5 Gigabit Ethernet |
| Features | |
| Windows operating systems supported | Windows 10 x64, Windows 11 x64 |
| Motherboard chipset family | AMD |
| Motherboard chipset | AMD B850 |
| Supported processor sockets | Socket AM5 |
| Certification | FCC, CE, ErP/EuP |
| Audio output channels | 7.1 channels |
| Motherboard form factor | micro ATX |
| Component for | PC |
| Audio chip | Realtek ALC897 |
| Product colour | Black |
| Expansion slots | |
| Number of M.2 (M) slots | 3 |
| PCI Express x16 (Gen 5.x) slots | 1 |
| PCI Express x4 (Gen 4.x) slots | 1 |
| 1st M.2 largest key size | 2280 |
| 1st M.2 highest PCI Express generation | 5.0 |
| 2nd M.2 largest key size | 2280 |
| 2nd M.2 highest PCI Express generation | 4.0 |
| 3rd M.2 largest key size | 2280 |
| 3rd M.2 highest PCI Express generation | 4.0 |
| BIOS | |
| BIOS type | UEFI AMI |
| BIOS memory size | 256 Mbit |
| Video | |
| Maximum resolution | 3840 x 2160 pixels |
| HDCP | Yes |
| Certificates | |
| Certification | FCC, CE, ErP/EuP |
| Software | |
| Windows operating systems supported | Windows 10 x64, Windows 11 x64 |
| Weight & dimensions | |
| Width | 244 mm |
| Depth | 244 mm |
| Packaging content | |
| Cables included | SATA |
| Screws included | Yes |
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