Fan Xpert 2+: Flexible controls for ultimate cooling and silence, plus GPU-temperature sensing for cooler gamin , 5X Protection III hardware-level safeguards provide component longevity and reliability , Ultrafast connectivity: Supreme flexibility with USB 3.1 Gen 2, Native M.2 , LED illumination: Lighting control for both PCIe slot and audio trace paths

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Product Specifications
Manufacturers Link
Motherboard Specifications
CPU SupportAMD Ryzen II & III Generation
CPU Socket TypeAM4
ChipsetAMD B450
Form FactorATX
Memory TypeDDR4
Memory Speed3466 MHz
Maximum Memory32 GB
Memory Slots2 Slots
M.2 SlotsYes
Warranty1 years

PRIME B450M-K - AMD Ryzen mATX Motherboard from ASUS


ASUS MICRO ATX MOTHERBOARD BUILT ON AMD AM4 SOCKETASUS Prime B450 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 B450 Series motherboard, you build smart, easy and affordably.

AMD B450Chipset

AM4CPU Socket

Micro ATXForm Factor

Enhanced UEFI BIOS

EASILY FIND YOUR WAY WITH EZ AND ADVANCED MODESThe UEFI BIOS is an early waypoint on any PC-building journey, and Prime B450 Series has one of the best in the business. The EZ mode makes it incredible easy to overclock a CPU to improve performance or even configure a RAID array for faster data retrieval and backups. Whether you're a PC novice or a seasoned overclocker, EZ and Advanced modes will help you quickly find your way, quickly and easily.

qfan control

Q-FAN CONTROLCan configure the fan's operating speed manually, or use the easy pre-configured fan profiles to select Standard, Silent, Turbo or Full Speed modes, plus automatic switch to full speed if the temperature hits 75°C.


SEARCH FUNCTIONWhen you're ready for a deeper dive, Advanced mode enables full control over every aspect of the motherboard — with a built-in Search function to find the setting you need in the blink of an eye.

Speed Up With Onboard M.2


ULTRAFAST M.2 CONNECTIVITY WITH RAID SUPPORTNot satisfied with single-storage device read/write speeds? Then join the fast lane and build a RAID 0 array using two PCIe storage drives to enjoy data transfers at lightning speeds. With x4 PCI Express® 3.0/2.0 bandwidth, M.2 supports up to 32Gbps data-transfer speeds. It's the perfect choice for an operating system or application drive, providing fast access to data.

USB 3.1 Gen 1 and 2


FUTURE-PROOF CONNECTIVITYUSB 3.1 Gen 1 is right where you need it, with two super-speed headers for the front panel. Experience data-transfer speeds up to 10X faster than USB 2.0 with instant plug-and-play connectivity, and avoid back-breaking contortions in the hunt for hard-to-reach rear ports. With backward-compatible USB 3.1 Gen 2 Type-A™, you'll experience ultimate connection flexibility and blazing data-transfer speeds of up to 10Gbps — twice as fast as standard USB 3.1 Gen 1.

AMD StoreMI Technology


AFFORDABLE ACCELERATION FOR ANY HARD DRIVEAMD StoreMI technology is a software utility that accelerates any drive for better system responsiveness with reduced startup and software load times. It combines SSD performance with the affordability and capacity of an HDD by automatically moving frequently accessed data to dedicated SSD storage.

Make Your Memory Faster


INDUSTRY-LEADING DDR4 MEMORY COMPATIBILITYFeaturing an array of trace layout tweaks that improve memory stability, PRIME B450 Series provides a potent foundation for your build. With comprehensive support for the full gamut of Ryzen memory configurations – from entry-level to performance-oriented — PRIME B450 Series is a versatile all-rounder that can work or play.

One-stop Efficient Controls


VERSATILE ENERGY PRODUCTIVITYThe Energy Processing Unit (EPU) automatically amplifies power consumption and maximises savings with Away mode. The smart setting that produces an extreme energy-saving setup by shutting down unused I/O controllers, with the EPU you will appreciate system-wide power reserves.

Cooler by Design


RESPONSIVE SURFACE CALIBRATIONPrime B450 Series features the most comprehensive cooling controls ever, configurable via ASUS Fan Xpert software or the UEFI BIOS. Each header can be set to monitor and react to up to three thermal sensors. Via Fan Xpert, you can also assign a sensor to monitor the temperature of supported ASUS graphics cards to ensure optimal cooling during GPU- or CPU-intensive workloads. Each onboard CHA FAN header supports PWM and DC mode.

PCB Protection III

5 x protection

SOLID MOTHERBOARD CONSTRUCTION AND DEFENSIVE TECHNOLOGIESPrime B450 Series motherboards are engineered with industry-leading 5X Protection III, employing the finest components, excellent circuit design and exacting standards to guarantee the quality and long-term durability of your investment. That means exceptional protection and stability for your build — thanks to decades of engineering experience from the world's leading motherboard brand.

ASUS SafeSlot Protection

safe slot

PROTECT YOUR GRAPHICS CARD INVESTMENTSafeSlot 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. Prime B450 Series motherboards also have strengthened solder points around both the PCIe and DIMM pins.

Exceptional Audio


COMBINED FEATURES DELIVER ELEVATED AUDIOASUS intelligent design combined with the finest hardware produce audio quality unlike anything you have ever experienced. With Audio Shielding, this separates layers for left and right tracks and analogue/digital signal domains, significantly decreasing multi-lateral interference. Exceptional components and Japanese-made audio capacitors, deliver an immersive sound signature with excellent fidelity.

Reliable Stability and Compatibility


PREMIUM ASUS TECHNOLOGYWith 2.5 x higher surge tolerance the ASUS LANGuard is hardware-level networking shield that employs signal-coupling technology and premium anti-EMI surface-mounted capacitors to ensure a more dependable connection and better output. Featuring an exclusive circuit-protecting design with built-in voltage regulators safeguards your motherboard from damage. Including ASUS-exclusive DIGI+ VRM for precision control and stable power, which transports power to the processor based on real-time demands. Corrosion-resistant stainless-steel back I/O panels bonded with chromium oxide assure a lifespan that's 3X longer than ordinary panels.

B450 Tried and Tested

TOP-TO-BOTTOM RELIABILITY WITH 8000+ VALIDATION HOURSASUS motherboards offer superb endurance. We verify this by subjecting every board to more than 8,000 hours of stringent tests. A barrage of burn-in, environmental, compatibility, software and safety tests confirm that our motherboards are exceptionally robust. It also shows that ASUS reliability surpasses industry standards, ensuring that every component is designed to function flawlessly in any environment.


TEMPERATURE AND HUMIDITY TESTSEnsures components withstand extreme conditions.


THERMAL MEASUREMENT TESTSEnsures that the system remains cool and stable under the heaviest loads.


INSERTION TESTSEvery port and connector is put through repeated installation cycles.


AGING TESTSUp to 48-hour aging test ensures reliability.


POWER-CONSUMPTION TESTSDelivers world-class energy efficiency.


TEMPERATURE AND DC MARGIN TESTSEnsures that the motherboard is capable of coping with voltages fluctuations caused by varying temperatures.


THERMAL-SHOCK TESTSEnsures ability to survive temperature changes during transportation.


NON-OPERATION SHOCK TESTSBuilt to withstand jolts that may occur during shipping.


BURN-IN TESTSEvery component is checked to ensure flawless operation.


INSTALLATION TESTSConnector placement is double-checked to ensure hassle-free installation.


DROP TESTSDrop tests from various heights ensure durability.


SALT AND SPRAY TESTSTested for I/O reliability, prolonged lifespan and rust-resistance.

BUILT TO LASTASUS is the world's leading motherboard brand. Our motherboards are extensively tested for compatibility with more than 1,000 components and devices, and each new model undergoes a minimum of 8,000 hours of strict validation — offering the peace of mind of knowing that your ASUS motherboard is fit for all environments and applications. Choosing ASUS is an assurance of trouble-free DIY experiences.


5X PROTECTIONHardware safeguards to ensure long-term durability.


520+ DDR4 COMPATIBILITYIndustry-leading DDR4 memory compatibility for best flexibility and reassurance.


1000+ COMPATIBLE DEVICESCompatibility with a range of CPUs, memory modules, graphics cards and more.


8000+ VALIDATION HOURSExtensive testing with latest components for enhanced reliability, compatibility and safety.

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