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| Overview | |
|---|---|
| Model | ASRock B850M Pro-A WiFi |
| Form Factor | Micro ATX (mATX) |
| Dimensions | 244 mm × 244 mm |
| Chipset | AMD B850 |
| PCB Layers | 6-Layer PCB |
| Part Numbers | 90-MXBR9-A0UAYZ / 90-MXBR90-A0UAYZ |
| Processor | |
| Socket | AMD AM5 (LGA1718) |
| Compatible CPUs | AMD Ryzen™ 9000, 8000 (Phoenix 1 & 2), and 7000 Series |
| CPU TDP Support | Up to 110W |
| Integrated Graphics | AMD RDNA™ (CPU-dependent) |
| Power Delivery | |
| Power Phase Design | 8+2+1 Phase (VCore + SOC + MISC) |
| MOSFET Type | Dr.MOS |
| ATX Power Connector | 1 × 24-pin ATX |
| CPU Power Connector | 1 × 8-pin ATX 12V (Hi-Density) |
| Memory | |
| Memory Type | DDR5 (ECC / non-ECC, Unbuffered) |
| DIMM Slots | 4 × DDR5 DIMM |
| Channel | Dual Channel |
| Max Speed | DDR5-4400 up to DDR5-8000+ (OC) |
| Max Capacity | 256 GB |
| OC Profiles | AMD EXPO™ & Intel XMP |
| Expansion Slots | |
| PCIE1 (CPU) | 1 × PCIe 5.0 x16 (x16 mode; Gen4x8 w/ Ryzen 8000 P1; Gen4x4 w/ Ryzen 8000 P2); 15μ Gold Contact |
| PCIE2 (Chipset) | 1 × PCIe 4.0 x4 (x4 mode; disabled if M2_3 occupied) |
| Key E Slot (Chipset) | 1 × M.2 Key E, type 2230 (Wi-Fi / BT PCIe module — pre-installed) |
| Storage | |
| M2_1 — Blazing M.2 (CPU) | Key M, type 2280, PCIe Gen5×4 (128 Gb/s); Gen4×4 w/ Ryzen 8000 P1; Gen4×2 w/ Ryzen 8000 P2 |
| M2_2 — Hyper M.2 (Chipset) | Key M, type 2280, PCIe Gen4×4 (64 Gb/s) |
| M2_3 — Hyper M.2 (CPU) | Key M, type 2280, PCIe Gen4×4 (64 Gb/s); shares bandwidth with PCIE2 |
| SATA Ports | 4 × SATA3 6.0 Gb/s |
| RAID Support | RAID 0, 1, 10 for SATA; RAID 0, 1, 10 for M.2 NVMe |
| NVMe Boot | Supported on all M.2 sockets |
| Display Outputs | |
| HDMI | 1 × HDMI 2.1 (TMDS/FRL 8G Compatible), supports HDR, HDCP 2.3, up to 4K @ 120Hz |
| DisplayPort | 1 × DisplayPort 1.4 with DSC (compressed), supports HDCP 2.3 |
| GPU Required | Requires CPU with integrated AMD RDNA™ graphics |
| USB — Rear I/O | |
| USB 3.2 Gen2 Type-C (10 Gb/s) | 1 × (CPU) |
| USB 3.2 Gen2 Type-A (10 Gb/s) | 1 × (CPU) |
| USB 3.2 Gen1 Type-A (5 Gb/s) | 2 × (Chipset) |
| USB 2.0 Type-A (480 Mb/s) | 4 × (via GL852 Hub, Chipset) |
| USB — Front Panel Headers | |
| USB 3.2 Gen1 Type-C Header (5 Gb/s) | 1 × (Chipset) |
| USB 3.2 Gen1 Headers (5 Gb/s) | 2 × headers (supports 4 × USB 3.2 Gen1 ports) |
| USB 2.0 Headers (480 Mb/s) | 2 × headers (supports 4 × USB 2.0 ports) |
| Networking | |
| LAN Controller | Realtek RTL8125BG Dragon 2.5G |
| LAN Speed | 2.5 Gb/s |
| Wi-Fi Standard | 802.11axe Wi-Fi 6E (IEEE 802.11a/b/g/n/ac/ax/axe) |
| Wi-Fi Bands | 2.4 GHz / 5 GHz / 6 GHz |
| Wi-Fi Configuration | Dual-band 2×2 MU-MIMO; 2T×2R diversity |
| Antennas | 2 × ASRock Wi-Fi 2.4/5/6 GHz antennas (included) |
| Bluetooth | Bluetooth 5.2 |
| Wi-Fi 6E OS Requirement | Windows 11 required for 6 GHz band |
| Audio | |
| Audio Codec | Realtek ALC897 |
| Channels | 7.1 CH HD Audio |
| Front Audio Header | 1 × HD Audio (HD_AUDIO1) |
| Fan & Cooling Headers | |
| CPU Fan Headers | 2 × 4-pin (Smart Fan Speed Control); CPU_FAN1 up to 1A/12W |
| Chassis Fan Headers | 3 × 4-pin (Smart Fan Speed Control); up to 3A/36W each |
| AIO Pump Header | 1 × 4-pin (Smart Fan Speed Control); up to 3A/36W |
| Fan Control | PWM & DC auto-detect (CPU_FAN2, CHA_FAN1–3, AIO_PUMP) |
| RGB / Lighting | |
| RGB LED Header | 1 × 4-pin (12V/G/R/B), max 3A/12W, up to 36W — for standard 5050 RGB LED strip |
| Addressable RGB Headers | 2 × 3-pin ARGB (5V/Data/GND), WS2812B, max 3A/5V (15W), up to 80 LEDs per strip |
| RGB Software | ASRock Polychrome SYNC; SignalRGB compatible |
| Onboard Headers & Connectors | |
| SPI TPM Header | 1 × |
| Power LED & Speaker Header | 1 × |
| Front Panel Header | 1 × (Power button, Reset button, HDD LED, Power LED) |
| Post Status Checker LEDs | Yes (CPU, DRAM, VGA, BOOT indicators) |
| CLRCMOS Jumper | 1 × (CLRCMOS1) |
| BIOS | |
| BIOS Type | AMI UEFI (128 Mb SPI Flash ROM) |
| BIOS Features | ASRock EZ Mode, Full HD UEFI, Instant Flash |
| BIOS Flashback | Yes — via dedicated button; no CPU or RAM required |
| Super I/O | NCT6796D-S |
| Software & Utilities | |
| Tuning Utility | ASRock A-Tuning (Fan-Tastic Tuning) |
| Network Software | ASRock Dragon 2.5G LAN Software |
| RGB Control | ASRock Polychrome SYNC; SignalRGB |
| Driver Installer | ASRock Auto Driver Installer (pre-loaded LAN driver) |
| Update Tool | ASRock Live Update & APP Shop |
| Box Contents | |
| Included Accessories | 2 × SATA data cables; 2 × Wi-Fi antennas; M.2 screws & standoffs; Quick installation guide |






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