Asrock B850M Pro RS mATX Motherboard | AM5 | 4x DDR5 Slots
KEY FEATURES
- Supports AMD Socket AM5 Ryzen™ 9000, 8000 and 7000 Series Processors
- 8+2+1 Phase Power Design, Dr.MOS for VCore+SOC+MISC
- 4 x DDR5 DIMMs, Supports Dual Channel, up to 8000+ (OC)
- 1 PCIe 5.0 x16, 1 PCIe 4.0 x4
- Graphics Output Options: 1 HDMI, 1 DisplayPort
- Realtek ALC897 7.1 CH HD Audio Codec, Nahimic Audio
- 1 Blazing M.2 (PCIe Gen5x4), 2 Hyper M.2 (PCIe Gen4x4), 4 SATA3
- 1 USB 3.2 Gen2 Type-C (Rear), 1 USB 3.2 Gen2 Type-A (Rear), 1 USB 3.2 Gen1 Type-C (Front), 6 USB 3.2 Gen1 (2 Rear, 4 Front), 8 USB 2.0 (4 Rear, 4 Front)
- Realtek 2.5G LAN
- Supports M.2 Bottom Heatsink, BIOS Flashback
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Reviews
Frequently Asked Questions
What processors are compatible with the Asrock B850M Pro RS?
How many memory slots does the motherboard have?
What is the maximum internal memory supported?
Asrock B850M Pro RS mATX Motherboard | AM5 | 4x DDR5 Slots
Description
The Asrock B850M Pro RS brings AMD's latest B850 chipset to a compact micro ATX form factor, making it an excellent choice for smaller builds that don't compromise on core functionality. This AM5 socket motherboard supports the full range of current AMD processors, from Ryzen 7000 through to the latest 9000 series chips. The B850 chipset positions this board in the mainstream segment, offering solid connectivity and features without the premium price of high-end chipsets.
Memory support centres on DDR5 with four DIMM slots capable of holding up to 256GB total capacity, supporting both ECC and standard non-ECC modules. Storage connectivity is particularly strong with three M.2 slots - the primary slot runs at PCIe 5.0 speeds for the fastest NVMe drives, while two additional PCIe 4.0 M.2 slots provide ample expansion. A single PCIe 5.0 x16 slot handles your graphics card, plus there's an additional PCIe 4.0 x4 slot for other expansion cards. Network connectivity includes 2.5 Gigabit Ethernet for faster local transfers, while 7.1 channel audio handles your sound needs.
The board includes practical touches like dual CPU fan headers for flexible cooling setups and RGB LED headers for lighting customisation. Asrock includes mounting screws in the box along with the standard I/O shield. The AMI UEFI BIOS provides straightforward setup and configuration, with memory profile support to get your DDR5 running at rated speeds. Two EPS 8-pin power connectors ensure stable power delivery to your chosen AMD processor.
Feature
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Eligible for Next day Delivery
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Shipping Information
- Next Business Day: £6.99
- 2 days Delivery: £4.99
- 3- 5 Days Shipping: £3.99
- Orders Over £99.00: Free Standard Delivery
| Processor | |
|---|---|
| Processor manufacturer | AMD |
| Processor socket | Socket AM5 |
| Compatible processor series | AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series |
| Supported processor sockets | Socket AM5 |
| Memory | |
|---|---|
| Supported memory types | DDR5-SDRAM |
| Number of memory slots | 4 |
| Memory slots type | DIMM |
| Memory channels | Dual-channel |
| ECC сompatibility | ECC & Non-ECC |
| Maximum internal memory | 256 GB |
| Unbuffered memory | Yes |
| Storage controllers | |
|---|---|
| Supported storage drive types | HDD & SSD |
| Supported storage drive interfaces | PCI Express 4.0, PCI Express 5.0, SATA III |
| Number of storage drives supported | 7 |
| RAID support | Yes |
| RAID levels | 0, 1, 10 |
| Graphics | |
|---|---|
| Parallel processing technology support | Not supported |
| Maximum resolution | 3840 x 2160 pixels |
| HDCP | Yes |
| Internal I/O | |
|---|---|
| USB 2.0 connectors | 2 |
| USB 3.2 Gen 1 (3.1 Gen 1) connectors | 3 |
| Number of SATA III connectors | 4 |
| Front panel audio connector | Yes |
| ATX Power connector (24-pin) | Yes |
| CPU fan connector | Yes |
| Number of CPU fan connectors | 2 |
| Number of chassis fan connectors | 3 |
| EPS power connector (8-pin) | Yes |
| Number of EPS power connectors (8-pin) | 1 |
| 12V power connector | Yes |
| TPM connector | Yes |
| RGB LED pin header | Yes |
| Number of RGB LED pin headers | 1 |
| Rear panel I/O ports | |
|---|---|
| USB 2.0 ports quantity | 4 |
| 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 |
| Ethernet LAN (RJ-45) ports | 1 |
| HDMI ports quantity | 1 |
| HDMI version | 2.1 |
| DisplayPorts quantity | 1 |
| DisplayPort version | 1.4 |
| Line-in | Yes |
| Headphone outputs | 3 |
| Microphone in | Yes |
| USB connector type | USB Type-A, USB Type-C |
| Network | |
|---|---|
| Ethernet LAN | Yes |
| Ethernet interface type | 2.5 Gigabit Ethernet |
| LAN controller | Dragon RTL8125BG |
| Wi-Fi | No |
| Features | |
|---|---|
| Component for | PC |
| Motherboard form factor | micro ATX |
| Motherboard chipset family | AMD |
| Motherboard chipset | AMD B850 |
| Audio chip | Realtek ALC897 |
| Audio output channels | 7.1 channels |
| Product colour | Black |
| Windows operating systems supported | Windows 10 x64, Windows 11 x64 |
| Certification | FCC, CE, ErP/EuP |
| Expansion slots | |
|---|---|
| PCI Express x4 (Gen 4.x) slots | 1 |
| PCI Express x16 (Gen 5.x) slots | 1 |
| Number of M.2 (M) slots | 3 |
| 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 |
| Weight & dimensions | |
|---|---|
| Width | 244 mm |
| Depth | 244 mm |
| Packaging content | |
|---|---|
| Screws included | Yes |
| Cables included | SATA |
Frequently Asked Questions
What processors are compatible with the Asrock B850M Pro RS?
How many memory slots does the motherboard have?
What is the maximum internal memory supported?
Does it support RGB lighting?
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