ASUS Prime B550M-A WiFi II AMD AM4 (3rd Gen Ryzen) Micro ATX Motherboard
ASUS Prime B550M-A WiFi II AMD AM4 (3rd Gen Ryzen) Micro ATX Motherboard
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ASUS Prime B550M-A WiFi II AMD AM4 (3rd Gen Ryzen) Micro ATX Motherboard
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BHD 54.900
– +
Model
BrandASUS
SeriesPrime
ModelPRIME B550M-A WIFI II
Part Number90MB19X0-M0AAY0
Supported CPU
CPU Socket Type AM4
CPU TypeSupports AMD Ryzen 5000 Series / 5000 G-Series / 4000 G-Series / 3000 Series Processors

* Refer to www.asus.com for CPU support list.
Chipsets
Chipset AMD B550
Memory
Number of Memory Slots4x288pin (DDR4)
Memory StandardDDR4 4866(OC) / 4800(OC) / 4600(OC) / 4466(OC) / 4400(OC) / 4333(OC) / 4266(OC) / 4200(OC) / 4133(OC) / 4000(OC) / 3866(OC) / 3733(OC) / 3600(OC) / 3466(OC) / 3400(OC) / 3333(OC) / 3200 / 3000 / 2933 / 2800 / 2666 / 2400 / 2133*

* Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists), and memory frequency support depends on the CPU types.
Maximum Memory Supported128GB
Channel Supported Dual Channel
Memory Performance ProfileIntel XMP 2.0
ECC SupportedECC memory (ECC mode) support varies by CPU
Buffer SupportedUn-buffered
Memory FeatureDDR4, 2133 MHz, 4, 128 GB
Expansion Slots
PCI Express 4.0 x161 x PCI Express 4.0 x16*

* Actual support may vary by CPU.
PCI Express 3.0 x16 1 x PCI Express 3.0 x16
PCI Express 2.0 x161 x PCI Express 2.0 x16
PCI Express x161 x PCI Express x16
PCI Express x43 x PCI Express x4
PCI Express x12 x PCIe 3.0 x1
PCI Slots1 x PCI Slot
Storage Devices
Serial ATA (SATA) 4 x SATA 6Gb/s
M.2AMD Ryzen 5000 Series/ 3000 Series Desktop Processors:
M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 4.0 x4 & SATA modes)
AMD Ryzen 5000 G-Series/ 4000 G-Series Desktop Processors:
M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 3.0 x4 & SATA modes)

AMD B550 Chipset:
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 3.0 x4 & SATA modes)
SATA RAID0/1/10
Onboard Video
Onboard Video Chipset Supported only by CPU with integrated graphic
Onboard Audio
Audio Chipset Realtek 7.1 Surround Sound High Definition Audio CODEC
Audio Channels 7.1 Channels*

* A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.
Onboard LAN
LAN ChipsetRealtek 1Gb Ethernet
Max LAN Speed1Gbps
Wireless LANWi-Fi 6
802.11 a/b/g/n/ac/ax
BluetoothBluetooth 5.2

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Rear Panel Ports
Back I/O Ports2 x USB 3.2 Gen 2 ports (2 x Type-A)
4 x USB 3.2 Gen 1 ports (4 x Type-A)
1 x D-Sub port
1 x DVI-D port
1 x HDMI port
1 x Wi-Fi Module
1 x Realtek 1Gb Ethernet port
3 x Audio jacks
1 x PS/2 Keyboard/Mouse combo port
PS/2 1
COM3
Video Ports1
HDMI 1 x HDMI
RJ451 x RJ45
USB 3.12 x USB 3.1