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Micro ATX motherboard dark PCB silver heatsinks rear I/O shield

ASUS

ASUS Prime B550M-A WiFi II AMD motherboard AM4 3rd Gen Ryzen Micro ATX

SKU CH-2NKG-Q96FS

Micro-ATX AM4 board with PCIe 4.0, WiFi 6, dual M.2 slots, 128 GB DDR4 support and 7.1 audio

  • CPU Socket TypeAM4
  • CPU TypeSupports AMD Ryzen 5000 Series / 5000 G-Series / 4000 G-Seri
  • ChipsetAMD B550
  • Number of Memory Slots4x288pin (DDR4)
  • Memory StandardDDR4 4866(OC) / 4800(OC) / 4600(OC) / 4466(OC) / 4400(OC) /
  • Maximum Memory Supported128GB
  • Ready for 3rd Gen Ryzen CPUs with AM4 socket and PCIe 4.0
  • Fast networking via WiFi 6 and 1Gb LAN plus USB 3.2 Gen 2 Type-A
  • Dual M.2 slots with one at PCIe 4.0 x4 for NVMe drives
  • 128GB DDR4 over four slots with OptiMem layout for higher speeds
  • 8+1 DrMOS power stages with alloy chokes for stable multi-core loads

Socket AM4 Micro-ATX Board

This Micro-ATX motherboard uses the AMD B550 chipset and Socket AM4 for Ryzen 5000 Series, 5000 G-Series, 4000 G-Series and 3000 Series processors. It targets builders who want a compact platform with PCIe 4.0 support and integrated WiFi 6 connectivity. Four DDR4 slots accept up to 128 GB of memory in dual-channel mode.

VRM Heatsink And SafeSlot

An 8+1 DrMOS power stage design with alloy chokes and durable capacitors feeds the CPU, while a VRM heatsink and PCH heatsink dissipate heat. The primary PCIe 4.0 x16 slot uses a reinforced SafeSlot core. Rear I/O includes HDMI 2.1 for 4K 60 Hz output, D-Sub, DVI, USB 3.2 Gen 2 Type-A, 1 Gb LAN and stainless-steel construction. Addressable Gen 2 RGB and standard RGB headers enable Aura Sync lighting control.

PCIe 4.0 M.2 And Memory Limits

The primary M.2 slot runs at PCIe 4.0 x4 with Ryzen 5000 and 3000 Series CPUs, but drops to PCIe 3.0 x4 with 5000 G-Series and 4000 G-Series chips. The second M.2 slot and two PCIe 3.0 x1 slots share bandwidth with the chipset. DDR4 speeds above 3200 MT/s require overclocking and depend on the specific processor and memory kit installed.

I korthet

  • Ready for 3rd Gen Ryzen CPUs with AM4 socket and PCIe 4.0
  • Fast networking via WiFi 6 and 1Gb LAN plus USB 3.2 Gen 2 Type-A
  • Dual M.2 slots with one at PCIe 4.0 x4 for NVMe drives
  • 128GB DDR4 over four slots with OptiMem layout for higher speeds
  • 8+1 DrMOS power stages with alloy chokes for stable multi-core loads

Specifikationer

BrandASUS
ModelPRIME B550M-A WIFI II
Part Number90MB19X0-M0AAY0
CPU Socket TypeAM4
CPU TypeSupports AMD Ryzen 5000 Series / 5000 G-Series / 4000 G-Series / 3000 Series Processors
* Refer to www.asus.com for CPU support list.
ChipsetAMD B550
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 SupportedDual Channel
ECC SupportedECC memory (ECC mode) support varies by CPU
Buffer SupportedUn-buffered
PCI Express 4.0 x161 x PCI Express 4.0 x16*
* Actual support may vary by CPU.
PCI Express x12 x PCIe 3.0 x1
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 ChipsetSupported only by CPU with integrated graphic
Audio ChipsetRealtek 7.1 Surround Sound High Definition Audio CODEC
Audio Channels7.1 Channels*
* A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.
LAN ChipsetRealtek 1Gb Ethernet
Max LAN Speed1Gbps
Wireless LANWi-Fi 6
802.11 a/b/g/n/ac/ax
BluetoothBluetooth 5.2
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
Onboard USB1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports
2 x USB 2.0 headers support additional 4 USB 2.0 ports
Other ConnectorsFan and Cooling related
1 x 4-pin CPU Fan header
1 x 4-pin CPU OPT Fan header
2 x 4-pin Chassis Fan headers
Miscellaneous
1 x Addressable Gen 2 header
2 x AURA RGB headers
1 x Clear CMOS header
1 x COM Port header
1 x Front Panel Audio header (AAFP)
1 x S/PDIF Out header
1 x Speaker header
1 x SPI TPM header (14-1pin)
1 x 10-1 pin System Panel header
Form FactorMicro ATX
LED LightingRGB
Dimensions (W x L)9.6" x 9.6"
Power Pin1 x 24-pin Main Power connector
1 x 8-pin +12V Power connector
Windows 11Ready
FeaturesSpecial Features:
ASUS 5X PROTECTION III
- DIGI+ VRM
- LANGuard
- Overvoltage Protection
- SafeSlot Core
- Stainless-Steel Back I/O
ASUS Q-Design
- Q-DIMM
- Q-Slot
ASUS Thermal Solution
- VRM heatsink design
AURA Sync
- AURA RGB headers
- Addressable Gen 2 header
Software Features:
ASUS Exclusive Software
Armoury Crate
- AURA Creator
- AURA Sync
AI Suite 3
- Performance and Power Saving Utility
TurboV EVO
EPU
DIGI+ VRM
Fan Xpert 2+
- EZ update
- Lighting Control
ASUS CPU-Z
AI Charger
DAEMON Tools
MyASUS
Norton Anti-virus software (Free Trial version)
WinRAR
UEFI BIOS
ASUS EZ DIY
- AS
Package ContentsAccessories:
Cables
2 x SATA 6Gb/s cables
Miscellaneous
1 x ASUS Wi-Fi moving antennas
1 x I/O Shield
1 x M.2 SSD screw package
Installation Media
1 x Support DVD
Documentation
1 x User manual

Frågor om den här produkten

Does the PCIe 4.0 x16 slot run at full 4.0 speed with a Ryzen 5000 series CPU?

The single PCIe 4.0 x16 SafeSlot operates at PCIe 4.0 x16 when a Ryzen 5000 or 3000 series desktop processor is installed; actual support may vary by CPU.

What case clearance does the Micro ATX board and its VRM heatsink require?

The board uses the Micro ATX form factor with a VRM heatsink and PCH heatsink; it fits any case that accepts Micro ATX motherboards and provides standard CPU cooler clearance around the socket area.

How do I enable WiFi 6 and Bluetooth on this motherboard, and which step is often missed?

Install the supplied external antennas on the rear I/O WiFi 6 (802.11ax) connectors, then install the driver from the ASUS support page; the step often missed is attaching both antennas before first boot.

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