ASUS AM4 PRIME B450M-K II Micro ATX Motherboard
PRIME B450M-K II
ASUS AM4 PRIME B450M-K II Micro ATX Motherboard

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.

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

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

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.
Brand | ASUS |
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Model | PRIME B450M-K II |
CPU Socket Type | AM4 |
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CPU Type | Supports 3rd / 2nd / 1st Gen AMD Ryzen Processors Supports 2nd / 1st Gen AMD Ryzen with Radeon Vega Graphics Processors Supports AMD Athlon with Radeon Vega Graphics Processors * Refer to www.asus.com for CPU support list. |
Chipset | AMD B450 |
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Number of Memory Slots | 2x288pin (DDR4) |
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Memory Standard | DDR4 4400(OC) / 4000(OC) / 3866(OC) / 3733(OC) / 3600(OC) / 3466(OC) / 3400(OC) / 3300(OC) / 3200(OC) / 3000(OC) / 2933(OC) / 2800(OC) / 2666 / 2400 / 2133* * Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists). * The maximum memory frequency supported varies by processor. |
Maximum Memory Supported | 64GB |
Channel Supported | Dual Channel |
ECC Supported | ECC Memory (ECC mode) support varies by CPU. |
Buffer Supported | Un-buffered |
PCI Express 3.0 x16 | 1 x PCI Express 3.0 x16* * Actual support may vary by CPU. |
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PCI Express x1 | 2 x PCIe 2.0 x1 |
SATA 6Gb/s | 4 x SATA 6Gb/s |
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M.2 | 3rd / 2nd / 1st Gen AMD Ryzen / 2nd and 1st Gen AMD Ryzen with Radeon Vega Graphics: 1 x M.2 Socket 3, with M key, type 2242/2260/2280 storage devices support (SATA & PCIE 3.0 x4 mode) Athlon with Radeon Vega Graphics Processors: 1 x M.2 Socket 3, with M key, type 2242/2260/2280 storage devices support (SATA mode) |
SATA RAID | 0/1/10 |
Onboard Video Chipset | Supported only by CPU with integrated graphic |
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Audio Chipset | Realtek ALC887/897 |
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Audio Channels | 7.1 Channels |
LAN Chipset | Realtek RTL8111H |
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Max LAN Speed | 1Gbps |
Back I/O Ports | 1 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) 4 x USB 3.2 Gen 1 (blue) Type-A 2 x USB 2.0 3 x Audio jack(s) 1 x BIOS FlashBack Button(s) |
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Onboard USB | 1 x USB 3.2 Gen 1 (up to 5Gbps) connector(s) support(s) additional 2 USB 3.2 Gen 1 port(s) (19-pin) 2 x USB 2.0 connector(s) support(s) additional 4 USB 2.0 port(s) |
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Other Connectors | 1 x CPU Fan connector(s) (1 x 4-pin) 1 x Chassis Fan connector(s) (1 x 4-pin) 1 x SPI TPM header 1 x COM port(s) connector(s) 1 x S/PDIF out header(s) 1 x Front panel audio connector(s) (AAFP) 1 x System panel(s) 1 x Clear CMOS jumper(s) 1 x COM port header 1 x Speaker connector |
Form Factor | Micro ATX |
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Dimensions (W x L) | 8.9" x 8.7" |
Power Pin | 1 x 24-pin EATX Power connector(s) 1 x 8-pin ATX 12V Power connector(s) |
Features | Software Features: ASUS Exclusive Software Armoury Crate AI Suite 3 - Performance and Power Saving Utility TurboV EVO EPU DIGI+ VRM Fan Xpert PC Cleaner - EZ update - System Information ASUS CPU-Z AI Charger ASUS EZ Installer 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 Solution - Aluminum heatsink design ASUS EZ DIY - BIOS FlashBack button - BIOS FlashBack LED ASUS Lighting Control BIOS: 256 MB Flash ROM, UEFI AMI BIOS Operating System: Windows 10 64-bit Windows 7 64-bit* * To support Windows 7 64-bit, please install an AMD Ryzen 2nd Generation or Ryzen 1st Generation Processor. |
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Package Contents | Accessories: User's manual I/O Shield 2 x SATA 6Gb/s cable(s) 1 x M.2 Anchor 1 x Supporting DVD |
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SKU | MBA-B450M-K-PRIMEII |
Brand | ASUS |
Unit Of Measure | ea |
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