Bring flexibility and power to your next build with the Prime B450M-A II AM4 Micro-ATX Motherboard from ASUS. Supporting AMD CPUs using the AM4 socket, this micro-ATX board features the B450 chipset. Install up to 128GB of dual-channel DDR4 RAM across four slots, with speeds up to 4400 MHz supported when overclocking. Install drives using one M.2 or six SATA III interfaces; connect a graphics card and other adapters using the PCIe 3.0 x16 and 2.0 x1 slots.

A rear I/O panel sports two USB 3.2 Gen 2 and four USB 3.2 Gen 1 Type-A ports. Connect a legacy mouse or keyboard using the PS/2 combo port; connect displays via the HDMI, DVI-D, or VGA ports. In addition to a Gigabit Ethernet port and three 3.5mm audio jacks, the rear panel also sports a BIOS flashback button. Internal headers support two USB 3.2 Gen 1 and four USB 2.0 ports on the front panel. Connectors for RGB, a TPM chip, two system fans, S/PDIF output, speakers, and a Clear CMOS are also present. Audio is handled by a Realtek audio codec that supports both 7.1 Surround Sound and 24-bit audio. The ASUS Prime B450M-A II AM4 Micro-ATX Motherboard is compatible with Windows 10 64-bit operating systems, as well as Windows 7 64-bit when using an AMD Ryzen 1st or 2nd Generation processor.

Micro-ATX Form Factor    AMD B450 Chipset    AM4 Socket    4 x Dual-Channel DDR4-4400 (OC)    6 x SATA III, 1 x M.2    1 x PCIe 3.0 x16 Slot    2 x PCIe 2.0 x1 Slots    7.1-Channel Realtek Audio Codec    Gigabit Ethernet    Supports Windows 7 & 10

This motherboard uses the AMD B450 chipset, and is compatible with 1st, 2nd, and 3rd Gen AMD Ryzen and Athlon CPUs featuring the AM4 socket.

With the Energy Processing Unit, or EPU, you can take advantage of system-wide power savings. The EPU automatically optimizes power consumption and maximizes savings with Away Mode.

Fan Xpert 2+ software provides comprehensive control over system fans. Auto-Tuning Mode intelligently configures all parameters with a single click. There's also an Extreme Quiet Mode that reduces chassis fan speeds to below the default minimum to keep your system quiet when performing light tasks. Fans can also be controlled via the UEFI BIOS.

The Digi+ voltage-regulation module or VRM delivers real-time control over voltage droop, automatically switching frequency and power-efficiency settings. It also allows you to fine-tune your CPU for ultimate stability and performance.

The Prime B450M II motherboard is engineered with multiple onboard heatsinks and an array of hybrid fan headers to ensure your rig stays cool and stable under intense workloads.

A VRM heatsink with a thermal pad underneath it improves heat transfer from the MOSFETs for better cooling performance.

Prime B450M-A II is engineered with an array of hybrid fan headers and features comprehensive cooling controls that are configurable via Fan Xpert 2+ software or via the UEFI BIOS, ensuring your rig stays cool and stable under intense workloads. Each header can monitor and react to dedicated thermal sensors, while a dedicated integrated circuit provides the fan headers with short circuit and over-temperature protections. Furthermore, each onboard CHA FAN header supports PWM and DC mode.

Install M.2 drives up to 22110 and get data transfer speeds up to 32 Gb/s via the x4 PCI Express 3.0 interface.

Doubling the speed of its predecessor, USB 3.2 Gen 2 features a maximum throughput of 10 Gb/s when used with compatible devices and is synonymous with USB 3.1 Gen 2.

Separates analog and digital signal domains, significantly reducing multi-lateral interference.

Ensures minimal crosstalk between audio paths.

ASUS Aura offers full RGB lighting control with a variety of functional presets for RGB LED strips connected to the onboard RGB headers. And it can all be synced with an ever-growing portfolio of Aura-capable hardware.

Armoury Crate is a software utility designed to give you centralized control of supported products. From a single intuitive interface, Armoury Crate allows you to easily customize RGB lighting and effects for every compatible device in your setup. The software also provides control of settings for ASUS products, including keyboard and mouse preferences.

BIOS FlashBack is the simplest and safest (UEFI) BIOS update method. Simply drop the (UEFI) BIOS file onto a FAT32 formatted USB stick, plug it into the USB BIOS FlashBack port, and press the button. Updates can even be performed without having memory or a CPU installed.

Featuring a fortified design that's anchored to the motherboard by a special hook, SafeSlot Core provides improved retention and shearing resistance over standard expansion slots.

Built-in voltage regulators protect your motherboard from damage caused by unexpected high-level voltages from unstable or inferior power supplies.

Onboard resettable fuses prevent overcurrent and short-circuit damage. This extends beyond I/O ports to DRAM to safeguard the lifespan of your system and connected devices.

Corrosion-resistant stainless-steel back I/O panels bonded with chromium oxide have a lifespan that's three times longer than ordinary panels.

ASUS LANGuard is a hardware-level network protection feature that integrates advanced signal-coupling technology and premium anti-EMI surface-mounted capacitors to improve throughput and ensure a more reliable connection.

Related Questions and Answers

Q: 1. Do it support ryzen 5 5600g or ryzen 5 5700g

A: Yes, the ASUS Prime B450M-A II AM4 Micro-ATX Motherboard supports the AMD Ryzen 5600G and 5700G processors.

Q: 2. What size tower is best for this motherboard?

A: Any of our ATX mid-tower cases would support this motherboard. Our mid-tower cases are the most common form factor and have enough room to fit systems with a closed-loop CPU cooler, a couple of graphics cards, and a lot of storage.Our COUGAR MX330 Mid-Tower Case B&H # COMX330G (search out site for this number) is very popular.

Q: 3. Is Limited Manufacturer's Warranty valid worldwide?? Thank you!! I am just missing the Motherboard and I do like its features for an entry-mid level gamer

A: The ASUS three-year limited manufacturer's warranty is only valid in Canada and the USA, when sold in either country/market.

Q: 4. does this motherboard support 1st and 2nd generation ryzen???

A: This supports 3rd gen ryzen CPUs.

Q: 5. Does this motherboard support Ryzen 7 5700G out of the box - without the need to update the BIOS first?

A: The ASUS Prime B550 Plus AM4 ATX Motherboard may need a bios update to work with the Ryzen 7 5700G.

Q: 6. Can I add wifi card on this board ? Does it have a slot support that ?

A: Yes you can add a USB or a PCIe based WiFi.

Q: 7. Do i need a cpu o update bios

A: Unfortunately we have no way of knowing which BIOS version the ASUS PRIME B550M-A/CSM AM4 Micro-ATX Motherboard will ship with.

Q: 8. Does it need a cpu to update bios

A: The ASUS Prime B550 Plus AM4 ATX Motherboard does not have a BIOS flashback button, so a compatible CPU would need to be installed to access the BIOS.

Q: 9. Does this motherboard have a preinstalled WiFi card?

A: No, unfortunately the ASUS Prime B550 Plus AM4 ATX Motherboard does not contain a preinstalled WiFi card.

Q: 10. Does it support ryzen 5 5600 / 5600x without bios update

A: The ASUS Prime B550 Plus AM4 ATX Motherboard is compatible with AM4 processors such as the Ryzen 5 5600x, but unfortunately we have no way of knowing which version of the BIOS it will ship with.