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ASUS

ASUS PRIME B550M-A AC AMD motherboard

SKU CH-T6N5-DWSM2 MPN PRIME B550M-A AC

Micro-ATX AM4 board with PCIe 4.0 x16, dual M.2 slots, 802.11ac Wi-Fi, USB 3.2 Gen 2 Type-A and four DDR4 slots up to 128 GB

  • 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

  • ASUS PRIME B550M-A AC AM4
  • ASUS PRIME B550M-A AC AM4 + AMD Ryzen 5 5500 + Team T-Force Delta RGB Model TF3D416G3200HC16FDC01

Struck-through versions exist but are not stocked here.

  • Ready for Ryzen 5000 and 3000 series CPUs with AM4 socket
  • Ultrafast storage via dual M.2 slots supporting PCIe 4.0 and SATA modes
  • Built-in 802.11ac Wi-Fi and USB 3.2 Gen 2 Type-A for quick connections
  • Aura Sync RGB lighting synchronises effects across compatible components
  • 128 GB DDR4 capacity across four slots with XMP 2.0 profiles

AM4 socket for Ryzen 5000 and 3000 Series

The ASUS PRIME B550M-A AC is a micro-ATX motherboard built around the AMD B550 chipset and AM4 socket. It supports Ryzen 5000 Series, 5000 G-Series, 4000 G-Series and 3000 Series desktop processors. The board includes integrated 802.11ac Wi-Fi and Aura Sync RGB lighting for system coordination.

DDR4 memory up to 128 GB capacity

Four 288-pin DDR4 slots accept up to 128 GB in dual-channel mode. Supported speeds range from 2133 MT/s to 4866 MT/s when overclocked, with XMP 2.0 profiles available. ECC memory support depends on the installed CPU. The primary M.2 socket handles 2242, 2260, 2280 and 22110 form factors over PCIe 4.0 x4 or SATA.

PCIe 4.0 x16 slot and SATA 6 Gbps limits

A single PCIe 4.0 x16 slot provides high-bandwidth graphics connectivity when paired with a compatible Ryzen processor; a second slot runs at PCIe 3.0 x16. Two PCIe 3.0 x1 slots add expansion room. Four SATA 6 Gbps ports support RAID 0, 1 and 10 arrays. USB 3.2 Gen 2 Type-A ports deliver 10 Gbps peripheral throughput.

Highlights

  • Ready for Ryzen 5000 and 3000 series CPUs with AM4 socket
  • Ultrafast storage via dual M.2 slots supporting PCIe 4.0 and SATA modes
  • Built-in 802.11ac Wi-Fi and USB 3.2 Gen 2 Type-A for quick connections
  • Aura Sync RGB lighting synchronises effects across compatible components
  • 128 GB DDR4 capacity across four slots with XMP 2.0 profiles

Specifications

BrandASUS
ModelPRIME B550M-A AC
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
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 x16None
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:
1 x M.2_1 socket 3, with M Key, Type 2242/2260/2280/22110 (PCIE 4.0 x4 and SATA modes) storage devices support
AMD Ryzen 5000 G-Series / 4000 G-Series Desktop Processors:
1 x M.2_1 socket 3, with M Key, Type 2242/2260/2280/22110 (PCIE 3.0 x4 and SATA modes) storage devices support
AMD B550 Chipset:
1 x M.2_2 socket 3, with M Key, Type 2242/2260/2280 (PCIE 3.0 x4 and SATA modes) storage devices support
SATA RAID0/1/10
Onboard Video ChipsetSupported only by CPU with integrated graphic
Audio ChipsetRealtek ALC887/897
Audio Channels7.1 Channels*
* A chassis with an HD audio module in the front panel is required to support 7.1-channel audio output.
LAN ChipsetRealtek RTL8111H
Max LAN Speed1Gbps
Wireless LANWi-Fi 802.11 a/b/g/n/ac
BluetoothBluetooth 5.0
Back I/O Ports1 x PS/2 keyboard/mouse combo port(s)
1 x DVI-D
1 x D-Sub
1 x HDMI
1 x LAN (RJ45) port(s)
2 x USB 3.2 Gen 2 (teal blue) (2 x Type-A)
4 x USB 3.2 Gen 1 (blue) Type-A
3 x Audio jack(s)
1 x ASUS Wi-Fi Module
HDMI1 x HDMI
USB 3.02 x USB 3.0
Onboard USB1 x USB 3.2 Gen 1 (up to 5Gbps) connector(s) support(s) additional 2 USB 3.2 Gen 1 port(s)
2 x USB 2.0 connector(s) support(s) additional 4 USB 2.0 port(s)
Other Connectors1 x CPU Fan connector(s)
1 x CPU OPT Fan connector(s)
2 x Chassis Fan connector(s)
2 x Aura RGB Strip Headers
1 x Addressable Gen 2 header(s)
1 x SPI TPM header
1 x S/PDIF out header(s)
1 x Front panel audio connector(s) (AAFP)
1 x Clear CMOS jumper(s)
1 x System panel connector
1 x COM port header
1 x Speaker connector
Form FactorMicro ATX
LED LightingRGB
Dimensions (W x L)9.6" x 9.6"
Power Pin1 x 24-pin EATX Power connector(s)
1 x 8-pin EATX 12V Power connectors
FeaturesSoftware 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
ASUS CPU-Z
AI Charger
DAEMON Tools
Norton Anti-virus software (Free Trial for 60 days)
WinRAR
UEFI BIOS
ASUS EZ DIY
- ASUS CrashFree BIOS 3
- ASUS EZ Flash 3
- ASUS UEFI BIOS EZ Mode
ASUS Special Features:
ASUS 5X PROTECTION III
- ASUS DIGI+ VRM
- ASUS LANGuard
- ASUS Overvoltage Protection
- ASUS SafeSlot Core
- ASUS Stainless-Steel Back I/O
ASUS Q-Design
- ASUS Q-DIMM
- ASUS Q-Slot
ASUS Thermal Soluti
Package ContentsAccessories:
I/O Shield
2 x SATA 6Gb/s cable(s)
1 x Supporting DVD
User manual
1 x Wi-Fi moving antenna
1 x M.2 SSD screw package(s)
Shipping weight1.26 kg
Package size275 × 266 × 68 mm

Questions about this item

Will my existing DDR4 memory kits work with the four 288-pin slots on this board?

The board accepts DDR4 modules up to 128 GB total across four slots; supported speeds range from 2133 to 4866(OC) depending on the installed CPU.

How can I confirm the PCIe 4.0 x16 slot and dual M.2 sockets are active after assembly?

Enter the UEFI BIOS and verify the primary x16 slot reports Gen 4.0 and both M.2 sockets show PCIe 4.0 x4 or SATA mode as detected.

Does the package include Wi-Fi antennas and SATA cables, or must I buy them separately?

The retail box ships with the motherboard, I/O shield, Wi-Fi antennas, SATA 6 Gb/s cables and documentation; no extra cables are required for basic installation.

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