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ASRock B850 PRO-A AM5 AMD B850 ATX Motherboard
OPEN BOX Product Type
- Supports AMD Socket AM5 Ryzen 9000, 8000 and 7000 Series Processors
- 14+2+1 Phase Power Design, 80A 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 x16, 1 M.2 Key E for WiFi
- Graphics Output Options: 1 HDMI, 1 USB Type-C (DP-alt)
- Realtek ALC897 7.1 CH HD Audio Codec
- 1 Blazing M.2 (PCIe Gen5x4), 2 Hyper M.2 (PCIe Gen4x4), 1 Ultra M.2 (PCIe Gen3x4), 4 SATA3
- 1 USB 3.2 Gen2x2 Type-C (Front), 1 USB 3.2 Gen2 Type-C (Rear), 1 USB 3.2 Gen1 Type-C (Rear), 6 USB 3.2 Gen1 (4 Rear, 2 Front), 9 USB 2.0 (6 Rear, 3 Front)
- Realtek 2.5G LAN
- Supports BIOS Flashback
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Specs
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Learn more about the ASRock B850 PRO-A
| Brand | ASRock |
|---|---|
| Model | B850 PRO-A |
| CPU Socket Type | AM5 |
|---|---|
| CPU Type | Ryzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series |
| Chipset | AMD B850 |
|---|
| Number of Memory Slots | 4x288pin (DDR5) |
|---|---|
| Memory Standard | Up to 8000+(OC) |
| Maximum Memory Supported | 256GB |
| Channel Supported | Dual Channel |
| ECC Supported | Yes |
| Buffer Supported | Un-buffered |
| PCI Express 5.0 x16 | 1 x PCIe 5.0 x16 Slot (PCIE1), supports x16 mode* * PCIE1 will run at Gen5x16 with 9000 and 7000 series processors, Gen4x8 with 8000 (Phoenix 1) series processors and Gen4x4 with 8000 (Phoenix 2) series processors. * If M2_3 is occupied, PCIE2 will be disabled. * Supports NVMe SSD as boot disks - 15µ Gold Contact in VGA PCIe Slot (PCIE1) |
|---|---|
| PCI Express 4.0 x16 | 1 x PCIe 4.0 x16 Slot (PCIE2), supports x4 mode* |
| Serial ATA (SATA) | 4 x SATA 6Gb/s |
|---|---|
| M.2 | CPU: - 1 x Blazing M.2 Socket (M2_1, Key M), supports type 2280 PCIe Gen5x4 (128 Gb/s) mode* - 1 x Hyper M.2 Socket (M2_2, Key M), supports type 2280 PCIe Gen4x4 (64 Gb/s) mode* Chipset: - 1 x Hyper M.2 Socket (M2_3, Key M), supports type 2230/2242/2260/2280 PCIe Gen4x4 (64 Gb/s) mode* - 1 x Ultra M.2 Socket (M2_4, Key M), supports type 2280 PCIe Gen3x4 (32 Gb/s) mode* * Supports NVMe SSD as boot disks * M2_1 is the first priority for M.2 installation. * M2_1 will run at Gen5x4 with 9000 and 7000 series processors and Gen4x4 with 8000 (Phoenix 1 and Phoenix 2) series processors. * M2_2 will run at Gen4x4 with 9000 and 7000 series processors, Gen4x4 with 8000 (Phoenix 1) series processors and Gen4x2 with 8000 (Phoenix 2) series processors. * If M2_3 is occupied, PCIE2 will be disabled. * If SATA3_1 or SATA3_2 is occupied, M2_4 will downgrade to Gen3x2 mode |
| SATA RAID | Supports RAID 0 and RAID 1 for SATA storage devices Supports RAID 0, RAID 1 and RAID 10 for M.2 NVMe storage devices |
| Audio Chipset | Realtek ALC897 |
|---|---|
| Audio Channels | 7.1 Channels |
| LAN Chipset | Dragon RTL8125BG |
|---|---|
| Max LAN Speed | 2.5Gbps |
| Back I/O Ports | 2 x Antenna Mounting Points 1 x HDMI Port 1 x USB 3.2 Gen2 Type-C Port (10 Gb/s) 1 x USB 3.2 Gen1 Type-C Port (DP-alt mode supports DP1.4a) 4 x USB 3.2 Gen1 Type-A Ports 6 x USB 2.0 Ports 1 x RJ-45 LAN Port 1 x BIOS Flashback Button HD Audio Jacks: Line in / Front Speaker / Microphone |
|---|
| Onboard USB | 2 x USB 2.0 Headers (Support 3 USB 2.0 ports) 1 x USB 3.2 Gen1 Header (Supports 2 USB 3.2 Gen1 ports) 1 x Front Panel Type C USB 3.2 Gen2x2 Header (20 Gb/s) |
|---|---|
| Other Connectors | 1 x SPI TPM Header 1 x Power LED and Speaker Header 1 x RGB LED Header* 3 x Addressable LED Headers** 2 x CPU Fan Connectors (4-pin) (Smart Fan Speed Control)*** 4 x Chassis Fan Connectors (4-pin) (Smart Fan Speed Control)*** 1 x AIO Pump Fan Connector (4-pin) (Smart Fan Speed Control)*** 1 x Front Panel Audio Connector * Supports in total up to 12V/3A, 36W LED Strip ** Support in total up to 5V/3A, 15W LED Strip *** CPU_FAN1 supports the fan power up to 1A (12W). *** CPU_FAN2, CHA_FAN1~4 and AIO_PUMP support the fan power up to 3A (36W). *** CPU_FAN2, CHA_FAN1~4 and AIO_PUMP can auto detect if 3-pin or 4-pin fan is in use. |
| Form Factor | ATX |
|---|---|
| Dimensions (W x L) | 12.0" x 9.6" |
| Power Pin | 1 x 24 pin ATX Power Connector 2 x 8 pin 12V Power Connectors (Hi-Density Power Connector) |
| BIOS Feature | 256Mb AMI UEFI Legal BIOS with GUI support |
|---|---|
| Software | Software - ASRock Motherboard Utility (A-Tuning) - ASRock Dragon 2.5G LAN Software - ASRock Polychrome SYNC * These utilities can be downloaded from ASRock Live Update & APP Shop. UEFI - ASRock EZ Mode - ASRock Full HD UEFI - ASRock Auto Driver Installer - ASRock Instant Flash |
| Windows 11 | Windows OS 10 64-bit / 11 64-bit |
| Features | Superb Productivity - PCIe Gen5 (Graphics, M.2) - Dual Channel DDR5 Rock-Solid Durability - 14+2+1 Power Phase, 80A Dr.MOS for VCore+SOC+MISC with Enlarged Heatsink Armor - Flexible Integrated I/O Shield Ultrafast Connectivity - 2.5G LAN EZ Update - BIOS Flashback Button - ASRock Auto Driver Installer EZ Troubleshooter - ASRock Post Status Checker |
|---|
| First Listed on Newegg | July 23, 2025 |
|---|
Warranty & Returns
Warranty, Returns, And Additional Information
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Manufacturer Contact Info
- Manufacturer Product Page
- Manufacturer Website
- Support Phone: 1-909-590-8308
- Support Email: [email protected]
- Support Website
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