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ASUS Prime B550M-K B550 mATX AM4 Motherboard
Dove Code: MAA57 |
Manufacturer: PRIME B550M-K


ASUS Prime series is expertly engineered to unleash the full potential of 3rd Generation AMD Ryzen platform. Boasting a robust power design, comprehensive cooling solutions and intelligent tuning options, Prime B550 series motherboards provide daily users and DIY PC builders a range of performance tuning options via intuitive software and firmware features.


36 Month Return to Base Warranty


  • AM4 Socket
  • AMD B550
  • mATX (244x244mm)
  • 4xDIMM
  • 1xPCIe4.0x16(x16), 2xPCIe3.0x1
  • 1xM.2 SATA/PCIe 4.0, 1xM.2 SATA/PCIe 3.0, 4x SATA
  • 4xUSB3.2 Type A (Gen 1), 2xUSB3.2 Type A (Gen 2)
  • 1xD-Sub, 1xDVI-D, 1xHDMI
  • RAID


AMD AM4 socket: Ready for 3rd Gen AMD Ryzen™ processors

Comprehensive cooling: PCH heatsink and Fan Xpert 2+

Ultrafast connectivity: Dual M.2, PCIe 4.0, 1 Gb Ethernet, USB 3.2 Gen 2 Type-A

5X Protection III: Multiple hardware safeguards for all-around system protection

ChipsetAMD B550
CPUBuild in AMD AM4 Socket 3rd Gen AMD Ryzen™ Processors
Form FactorMicro ATX Form Factor
(24.4 x 24.4cm)
Memory3rd Gen AMD Ryzen Processors
4 x DIMM, Max. 128GB, DDR4 4600(O.C), 4400(O.C), 4266(O.C.), 4133(O.C.), 4000(O.C.), 3866(O.C.)/3733(O.C.), 3600(O.C.), 3466(O.C.), 3333(O.C.), 3200, 3000, 2800, 2666, 2400, 2133 MHz Un-buffered Memory
Next Generation AMD Ryzen PRO Processors

4x DIMM, Max. 128GB, DDR4 4800(O.C.), 4600(O.C), 4466(O.C.), 4400(O.C), 4266(O.C.), 4133(O.C.), 4000(O.C.), 3866(O.C.), 3733(O.C.), 3600(O.C.), 3466(O.C.), 3333(O.C.), 3200, 3000, 2800, 2666, 2400, 2133 MHz Un-buffered Memory
Dual Channel Memory Architecture
ECC Memory (ECC mode) support varies by CPU.
Onboard Graphics1x D-Sub
1x DVI-D
1x HDMI 2.1(4K@60HZ)
AudioRealtek ALC887 7.1 Surround Sound High Definition Audio CODEC
- Supports : Jack-detection, Multi-streaming, Front Panel Jack-retasking, up to 24-Bit/192kHz playback
LANRealtek RTL8111H 1Gb Ethernet
Expansion Slots3rd Gen AMD Ryzen™ Processors
1x PCIe 4.0 x16 (x16 mode)

AMD B550 Chipset
2x PCIe 3.0 x1
Multi-Graphics TechnologyN/A
Storage InterfaceTotal supports 2x M.2 slots and 4x SATA 6Gb/s ports

3rd Gen AMD Ryzen™ Processors:
1x M.2 Socket 3, with M Key, Type 2242/2260/2280/22110(PCIE 4.0 x4 and SATA modes) storage devices support

AMD B550 Chipset:
1x M.2 Socket 3, with M Key, Type 2242/2260/2280 (PCIE 3.0 x4 and SATA modes) storage devices support
4x SATA 6Gb/s port(s),
Support Raid 0, 1, 10
USBRear USB Port (Total 6)
2x USB 3.2 Gen 2 port(s)(2x Type-A)
4x USB 3.2 Gen 1 port(s)(4x Type-A)

Front USB Port (Total 6)
2x USB 3.2 Gen 1 port(s)(2x Type-A)
4x USB 2.0 port(s)(4x Type-A)
Internal I/O Connectors1x CPU Fan connector(s)
2x Chassis Fan connector(s)
1x USB 3.2 Gen 1(up to 5Gbps) connector(s) support(s) additional 2 USB 3.2 Gen 1 port(s)
2x USB 2.0 connector(s) support(s) additional 4 USB 2.0 port(s)
1x M.2 Socket 3 with M key, type 2242/2260/2280/22110 storage devices support(SATA & PCIe 4.0 x4 mode)
1x M.2 Socket 3 with M key, type 2242/2260/2280 storage devices support (SATA & PCIE 3.0 x 4 mode)
1x SPI TPM header
4x SATA 6Gb/s connector(s)
1x S/PDIF out header(s)
1x 24-pin EATX Power connector(s)
1x 8-pin EATX 12V Power connectors
1x Front panel audio connector(s) (AAFP)
1x Clear CMOS jumper(s)
1x System panel connector
1x COM port header
1x Speaker connector
Back Panel Connectors1x PS/2 keyboard/mouse combo port(s)
1x DVI-D
1x D-Sub
1x LAN (RJ45) port(s)
2x USB 3.2 Gen 2 (teal blue) (2x Type-A)
4x USB 3.2 Gen 1 (blue) Type-A
3x Audio jack(s)
Operating SystemWindows 10 64-bit
See full manufacturer specifications