PLEASE NOTE:

5th gen Ryzen CPUs will require a BIOS update to work

AMD B450 (Ryzen AM4) micro ATX motherboard with M.2 support, HDMI/DVI-D/D-Sub, SATA 6 Gbps, 1 Gb Ethernet, USB 3.2 Gen 1 Type-A, BIOS FlashBack™

Comprehensive cooling: PCH heatsink and Fan Xpert

Ultrafast connectivity: M.2 support, 1 Gb Ethernet, and USB 3.2 Gen 1 Type-A

5X Protection III: Multiple hardware safeguards for all-around system protection

LED illumination: Lighting control for both PCIe slot and audio trace paths

Prime

ASUS Prime B450M II Series motherboards provide the solid foundation needed for your first build, plus flexibility to grow with your ambitions. We've melded all the good stuff that's packed into AMD Ryzen™ processors with essential ASUS design and engineering, so you benefit from industry-leading technologies — including automated system tuning, comprehensive cooling controls, and immersive onboard audio. When you build with an ASUS Prime B450M II Series motherboard, you build smart, easy and affordably.

Tune It Your Way

Comprehensive controls form the foundation of the ASUS Prime series. The Prime B450M II motherboard packs flexible tools to tune every aspect of your system, enabling you to tweak performance settings to perfectly match the way you work – maximizing your productivity.

Cooler by Design

PRIME B450M-K II is engineered with an array of hybrid fan headers and features comprehensive cooling controls that are configurable via Fan Xpert software or via the UEFI BIOS, ensuring your rig stays cool and stable under intense workloads.

Build on a Solid Foundation

Prime B450M II motherboard provides all the fundamentals to boost daily productivity, so your system will be ready for action with stable power, intuitive cooling and flexible transfer options.

Achieve speed with onboard M.2

M.2 Slot supports data-transfer speed up to 32Gbps via x4 PCI Express® 3.0 bandwidth. It‘s the perfect choice for an operating system or application drive, providing fast access to data.

USB 3.2 Gen 1 Type-A

Numerous USB ports support high-end rigs loaded with peripherals, including four rear-panel USB Type-A connectors with fast USB 3.2 Gen 1 connectivity for compatible cases.

Outstanding Audio

Combined onboard features deliver elevated audio

Intelligent design and premium hardware create audio quality unlike anything you've ever experienced.

Audio Shielding

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

Separate Layer for Left and Right Tracks

Ensures minimal crosstalk between audio paths.

Premium Japanese Capacitors

Premium parts provide an immersive sound signature, with exceptional fidelity.

BIOS FLASHBACK™

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.

SafeSlot Core

Fortified PCIe slot prevents damage

SafeSlot Core is the ASUS-exclusive PCIe slot. Featuring a fortified design that's anchored to the motherboard by a special hook, SafeSlot Core provides 1.6x stronger retention and 1.3x greater shearing resistance than standard expansion slots.

Overvoltage Protection

World-class circuit-protecting power design

An exclusive circuit design with built-in voltage regulators to protect your motherboard from damage caused by unexpected high-level voltages from unstable or inferior power supplies.

DRAM Overcurrent Protection

Short-circuit damage prevention

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.

Stainless-Steel Back I/O

3X corrosion-resistance for greater durability

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

LANGuard

Pumped-up throughput 2.5X higher surge tolerance

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.

Motherboard Type
Desktop

Form Factor
Micro ATX

Socket
AMD AM4

Chipset
AMD B450

RAM Technology
DDR4 (Dual Channel)

RAM Slots
2 x DIMM

RAM Speeds
4400(O.C)/4000(O.C.)/3866(O.C.)/3733(O.C.)/3600(O.C.)/3466(O.C.)/3400(O.C.)/3300(O.C.)/3200(O.C.)/3000(O.C.)/2933(O.C.)/2800(O.C.)/2666/2400/2133 MHz

Maximum Memory
64GB

Graphics
Integrated Graphics Processor*

Graphics specifications may vary between CPU types

Graphics Ports
1 x VGA
1 x DVI-D
1 x HDMI

Multi-GPU Support
-

PCI/PCI Express
1 x PCIe 3.0 x16
2 x PCIe 2.0 x1

Storage
4 x SATA III
1 x M.2 (2242/2260/2280) - SATA & PCIe*
*PCIe mode not supported with Athlon CPUs

RAID
RAID 0, 1, 10

Wireless
-

LAN
GB LAN

Audio
Realtek ALC887/897 7.1-Channel High Definition Audio CODEC

USB Ports Supported
6 x USB 3.2 Gen1 (4 at back, 2 at mid-board)
6 x USB 2.0 (2 at back, 4 at mid-board)

Back Panel I/O Ports
1 x PS/2 keyboard/mouse
1 x DVI-D
1 x D-Sub
1 x HDMI
1 x LAN (RJ45)
4 x USB 3.2 Gen1 Type-A
2 x USB 2.0
3 x Audio jacks
1 x BIOS FlashBack Button

Internal I/O Connectors
1 x CPU Fan
1 x Chassis Fan
1 x USB 3.2 Gen1
2 x USB 2.0
1 x M.2 Socket 3 with M key
1 x SPI TPM
1 x COM port
4 x SATA 6Gb/s
1 x S/PDIF out
1 x 24-pin EATX
1 x 8-pin ATX 12V
1 x Front audio

1 x System panel
1 x Clear CMOS jumper
1 x COM port header
1 x Speaker

Accessories
Users manual
I/O Shield
2 x SATA 6Gb/s cables
1 x M.2 Anchor
1 x Supporting DVD