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Green Micro ATX board with silver heatsinks and black slots

ASUS

ASUS PRIME B550M-A WIFI II AMD motherboard

SKU CH-E5SM-JH7YN MPN PRIME B550M-A WIFI II

Micro-ATX AM4 board with PCIe 4.0, WiFi 6, dual M.2 slots, 128 GB DDR4 support and 8+1 DrMOS power stages

  • 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

Option PRIME B550M-A WIFI II

  • PCIe 4.0 x16 slot for high-speed graphics cards
  • WiFi 6 (802.11ax) and 1Gb LAN for fast networking
  • Dual M.2 slots with one PCIe 4.0 x4 for quick storage
  • 8+1 DrMOS power stages deliver stable CPU power
  • Aura Sync RGB with Addressable Gen 2 header for lighting control

AM4 Socket for Ryzen 5000 Series

The ASUS Prime B550M-A WIFI II is a Micro ATX motherboard built on the AMD B550 chipset. It supports AMD Ryzen 5000 Series, 5000 G-Series, 4000 G-Series and 3000 Series processors. The board targets mainstream PC users and DIY builders who need a compact foundation with PCIe 4.0, WiFi 6 and 1Gb LAN connectivity.

CPU Cooler Clearance and M.2 Screw

Verify that your CPU cooler fits the AM4 mounting pattern and does not block the four DDR4 slots or the primary PCIe 4.0 x16 SafeSlot. Confirm your chassis has a standoff for the M.2 slot that supports PCIe 4.0 x4 NVMe drives. Check the ASUS CPU support list for your specific processor before ordering.

Fan Xpert 2 and Aura Sync RGB

The bundled Fan Xpert 2 utility lets you configure hybrid fan headers for balanced airflow across the VRM heatsink and PCH heatsink. Aura Sync software synchronises LED effects through the onboard RGB header and Addressable Gen 2 RGB header with compatible strips and components. These tools adjust cooling curves and lighting without extra hardware.

Besonderheiten

  • PCIe 4.0 x16 slot for high-speed graphics cards
  • WiFi 6 (802.11ax) and 1Gb LAN for fast networking
  • Dual M.2 slots with one PCIe 4.0 x4 for quick storage
  • 8+1 DrMOS power stages deliver stable CPU power
  • Aura Sync RGB with Addressable Gen 2 header for lighting control

Technische Daten

BrandASUS
SeriesPrime
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
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
PCI Express 4.0 x161 x PCI Express 4.0 x16*
* Actual support may vary by CPU.
PCI Express 3.0 x161 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
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
PS/21
COM3
Video Ports1
HDMI1 x HDMI
RJ451 x RJ45
USB 3.12 x USB 3.1
USB 3.010 x USB 3.0
USB 1.1/2.09 x USB 2.0
eSATA1 x eSATA 3Gb/s
S/PDIF Out1 x Optical, 1 x Coaxial
S/PDIF In1 x Optical, 1 x Coaxial
Game/MIDI Ports1
Audio Ports6 Ports
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
Softwarewindows_10
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
Versandgewicht1.16 kg
Paketgröße273 × 267 × 68 mm

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Fragen zu diesem Artikel

Does the ASUS PRIME B550M-A WIFI II include WiFi 6 antennas and cables, or must I buy them separately?

The board ships with the WiFi 6 module installed and includes the external antennas and cables in the box, so no separate purchase is needed for wireless connectivity.

Which DDR4 speed should I choose for this motherboard — 3200 MHz or one of the higher OC ratings such as 4800 MHz?

The board runs DDR4 at 2133 MHz by default; speeds up to 4866 MHz are overclocked profiles that require XMP 2.0 kits and manual tuning in the BIOS.

What does the PCIe 4.0 x16 SafeSlot mean for a graphics card installed in the primary slot?

The top PCIe 4.0 x16 slot delivers full PCIe 4.0 bandwidth to a compatible Ryzen 5000 series CPU and uses a reinforced SafeSlot design for heavier cards.

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