Micron Technology, Inc.
Micron Technology, Inc. MT4JTF12864AZ-1G4D1 1GB DDR3 1333 Desktop RAM
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ASUS
ASUS Prime B550M-A WiFi II AMD motherboard AM4 3rd Gen Ryzen Micro ATX
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.
Highlights
- 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
Specifications
| Brand | ASUS |
|---|---|
| Model | PRIME B550M-A WIFI II |
| Part Number | 90MB19X0-M0AAY0 |
| CPU Socket Type | AM4 |
| CPU Type | Supports AMD Ryzen 5000 Series / 5000 G-Series / 4000 G-Series / 3000 Series Processors * Refer to www.asus.com for CPU support list. |
| Chipset | AMD B550 |
| Number of Memory Slots | 4x288pin (DDR4) |
| Memory Standard | DDR4 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 Supported | 128GB |
| Channel Supported | Dual Channel |
| ECC Supported | ECC memory (ECC mode) support varies by CPU |
| Buffer Supported | Un-buffered |
| PCI Express 4.0 x16 | 1 x PCI Express 4.0 x16* * Actual support may vary by CPU. |
| PCI Express x1 | 2 x PCIe 3.0 x1 |
| Serial ATA (SATA) | 4 x SATA 6Gb/s |
| M.2 | AMD 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 RAID | 0/1/10 |
| Onboard Video Chipset | Supported only by CPU with integrated graphic |
| 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. |
| LAN Chipset | Realtek 1Gb Ethernet |
| Max LAN Speed | 1Gbps |
| Wireless LAN | Wi-Fi 6 802.11 a/b/g/n/ac/ax |
| Bluetooth | Bluetooth 5.2 |
| Back I/O Ports | 2 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 USB | 1 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 Connectors | Fan 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 Factor | Micro ATX |
| LED Lighting | RGB |
| Dimensions (W x L) | 9.6" x 9.6" |
| Power Pin | 1 x 24-pin Main Power connector 1 x 8-pin +12V Power connector |
| Windows 11 | Ready |
| Features | Special 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 Contents | Accessories: 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 |
Questions about this item
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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