Asrock B550M/AC AM4 mATX Motherboard

CPU

- Supports AMD AM4 Socket Ryzen™ 3000, 3000 G-Series, 4000 G-Series, 5000 and 5000 G-Series Desktop Processors*    

- Digi Power design         

- 8 Power Phase design 

*Please refer to CPU support list for details.         

Chipset

AMD B550         

Memory

- Dual Channel DDR4 Memory Technology

- 4 x DDR4 DIMM Slots  

- AMD Ryzen series CPUs (Vermeer) support DDR4 4533+(OC) / 4466(OC) / 4400(OC) / 4333(OC) / 4266(OC) / 4200(OC) / 4133(OC) / 4000(OC) / 3866(OC) / 3800(OC) / 3733(OC) / 3600(OC) / 3466(OC) / 3200 / 2933 / 2667 / 2400 / 2133 ECC & non-ECC, un-buffered memory*         

- AMD Ryzen series CPUs (Matisse) support DDR4 4533+(OC) / 4466(OC) / 4400(OC) / 4333(OC) / 4266(OC) / 4200(OC) / 4133(OC) / 4000(OC) / 3866(OC) / 3800(OC) / 3733(OC) / 3600(OC) / 3466(OC) / 3200 / 2933 / 2667 / 2400 / 2133 ECC & non-ECC, un-buffered memory*         

- AMD Ryzen series APUs (Cezanne) support DDR4 4733+(OC) / 4666(OC) / 4600(OC) / 4533(OC) / 4466(OC) / 4400(OC) / 4333(OC) / 4266(OC) / 4200(OC) / 4133(OC) / 4000(OC) / 3866(OC) / 3800(OC) / 3733(OC) / 3600(OC) / 3466(OC) / 3200 / 2933 / 2667 / 2400 / 2133 ECC & non-ECC, un-buffered memory*             

- AMD Ryzen series APUs (Renoir) support DDR4 4733+(OC) / 4666(OC) / 4600(OC) / 4533(OC) / 4466(OC) / 4400(OC) / 4333(OC) / 4266(OC) / 4200(OC) / 4133(OC) / 4000(OC) / 3866(OC) / 3800(OC) / 3733(OC) / 3600(OC) / 3466(OC) / 3200 / 2933 / 2667 / 2400 / 2133 ECC & non-ECC, un-buffered memory*             

- Max. capacity of system memory: 128GB**      

- Supports Extreme Memory Profile (XMP) memory modules       

- 15μ Gold Contact in DIMM Slots             

*For Ryzen Series APUs (Cezanne and Renoir), ECC is only supported with PRO CPUs.    
Please refer to below table for AMD non-XMP memory frequency support. For more details.
    

**Due to the operating system limitation, the actual memory size may be less than 4GB for the reservation for system usage under Windows® 32-bit OS. For Windows® 64-bit OS with 64-bit CPU, there is no such limitation.

BIOS

- 256Mb AMI UEFI Legal BIOS with GUI support 

- Supports "Plug and Play"           

- ACPI 5.1 compliance wake up events    

- Supports jumperfree   

- SMBIOS 2.3 support    

- CPU, CPU VDDCR_SOC, DRAM, VPPM, +1.8VSB Voltage Multi-adjustment           

Graphics

- Integrated AMD Radeon™ Vega Series Graphics in Ryzen Series APU*    

- DirectX 12, Pixel Shader 5.0      

- Shared memory default 2GB. Max Shared memory supports up to 16GB.**        

- Supports HDMI 2.1 with max. resolution up to 4K x 2K (4096x2160) @ 60Hz       

- Supports Auto Lip Sync, Deep Color (12bpc), xvYCC and HBR (High Bit Rate Audio) with HDMI 2.1 Port (Compliant HDMI monitor is required)       

- Supports HDR (High Dynamic Range) with HDMI 2.1      

- Supports HDCP 2.3 with HDMI 2.1 Port

- Supports 4K Ultra HD (UHD) playback with HDMI 2.1 Port           

- Supports Microsoft® PlayReady              

*Actual support may vary by CPU             

**The Max shared memory 16GB requires 32GB system memory installed.            

Audio

- 7.1 CH HD Audio with Content Protection (Realtek ALC1220/ALC1200 Audio Codec)

- Premium Blu-ray Audio support             

- Supports Surge Protection        

- PCB Isolate Shielding   

- Nahimic Audio

LAN

- PCIE x1 Gigabit LAN 10/100/1000 Mb/s

- Realtek RTL8111H        

- Supports Wake-On-LAN             

- Supports Lightning/ESD Protection       

- Supports Energy Efficient Ethernet 802.3az       

- Supports PXE  

Wireless LAN

- Intel® 802.11ac WiFi Module   

- Supports IEEE 802.11a/b/g/n/ac            

- Supports Dual-Band (2.4/5 GHz)            

- Supports high speed wireless connections up to 433Mbps         

- Supports Bluetooth 4.2+ High speed class II       

Slots

AMD Ryzen series CPUs (Vermeer and Matisse)  

- 2 x PCI Express x16 Slots (PCIE1: Gen4x16 mode; PCIE3: Gen3 x4 mode)*             

AMD Ryzen series APUs (Cezanne and Renoir)    

- 2 x PCI Express x16 Slots (PCIE1: Gen3x16 mode; PCIE3: Gen3 x4 mode)*             

- 1 x PCI Express 3.0 x1 Slot         

- Supports AMD Quad CrossFireX™ and CrossFireX™        

- 1 x M.2 Socket (Key E) with the bundled WiFi-802.11ac PCIe WiFi module            

*Supports NVMe SSD as boot disks          

Storage

- 4 x SATA3 6.0 Gb/s Connectors, support RAID (RAID 0, RAID 1 and RAID 10), NCQ, AHCI and Hot Plug       

- 1 x Hyper M.2 Socket (M2_1), supports M Key type 2280 M.2 PCI Express module up to Gen4x4 (64 Gb/s) (with Vermeer, Matisse) or Gen3x4 (32   Gb/s) (with Cezanne and Renoir)*             

*Supports NVMe SSD as boot disks          

Connector

- 1 x COM Port Header   

- 1 x SPI TPM Header      

- 1 x Power LED and Speaker Header        

- 2 x RGB LED Headers* 

- 2 x Addressable LED Headers**               

- 1 x CPU Fan Connector (4-pin)***         

- 3 x Chassis/Water Pump Fan Connectors (4-pin) (Smart Fan Speed Control)****

- 1 x 24 pin ATX Power Connector             

- 1 x 8 pin 12V Power Connector

- 1 x Front Panel Audio Connector            

- 2 x USB 2.0 Headers (Support 4 USB 2.0 ports) (Supports ESD Protection)            

- 2 x USB 3.2 Gen1 Headers (Support 4 USB 3.2 Gen1 ports) (Supports ESD Protection)     

*Support in total up to 12V/3A, 36W LED Strip   

**Support in total up to 5V/3A, 15W LED Strip    

***The CPU Fan Connector supports the CPU fan of maximum 1A (12W) fan power.         

****The Chassis/Water Pump Fan supports the water cooler fan of maximum 2A (24W) fan power.           

CHA_FAN1/WP, CHA_FAN2/WP and CHA_FAN4/WP can auto detect if 3-pin or 4-pin fan is in use.

Rear Panel I/O

- 2 x Antenna Ports         

- 1 x PS/2 Mouse/Keyboard Port

- 1 x HDMI Port 

- 4 x USB 3.2 Gen1 Ports (ASMedia ASM1074 hub) (Supports ESD Protection)

- 2 x USB 2.0 Ports (Supports ESD Protection)      

- 1 x RJ-45 LAN Port with LED (ACT/LINK LED and SPEED LED)        

- HD Audio Jacks: Line in / Front Speaker / Microphone   

Software and UEFI

Software             

- ASRock Motherboard Utility (A-Tuning)

- ASRock Polychrome SYNC          

- ASRock XFast LAN         

UEFI      

- ASRock Full HD UEFI    

- ASRock Instant Flash   

*These utilities can be downloaded from ASRock Live Update & APP Shop.            

Support CD

Drivers, Utilities, AntiVirus Software (Trial Version), Google Chrome Browser and Toolbar 

Accessories

- Quick Installation Guide, Support CD, I/O Shield               

- 2 x SATA Data Cables    

- 2 x ASRock WiFi 2.4/5 GHz Antennas    

- 1 x Screw for M.2 Socket            

Hardware Monitor

- Temperature Sensing: CPU, Chassis/Water Pump Fans  

- Fan Tachometer: CPU, Chassis/Water Pump Fans            

- Quiet Fan (Auto adjust chassis fan speed by CPU temperature): CPU, Chassis/Water Pump Fans 

- Fan Multi-Speed Control: CPU, Chassis/Water Pump Fans            

- Voltage monitoring: +12V, +5V, +3.3V, CPU Vcore, CPU VDDCR_SOC, DRAM, VPPM, +1.8V            

Form Factor

- Micro ATX Form Factor: 9.6-in x 9.6-in, 24.4 cm x 24.4 cm           

- Solid Capacitor design 

- 2oz Copper PCB             

OS

- Microsoft® Windows® 10 64-bit / 11 64-bit       

Certifications     

- FCC, CE              

- ErP/EuP ready (ErP/EuP ready power supply is required)