ASUS Prime B450M-K II (Socket AM4/B450/DDR4/S-ATA 600/Micro ATX)

Name: ASUS Prime B450M-K II (Socket AM4/B450/DDR4/S-ATA 600/Micro ATX)
Brand: Unbranded
SKU: B07F6YQV4J
Price: 134.99 USD
Availability: InStock

By Mike Perry, Hardware Editor · Verified 2026-09-23

Mike Perry has researched PC hardware since 2014, tracking 80+ GPU generations, 50+ retro handheld platforms, and 30+ vintage PC configurations. He synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides. View full credentials →

$134.99

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View Current Price on Amazon → Compare to similar motherboards

*Price sourced from Amazon.com. Price data may not reflect current market pricing — verify on Amazon before purchase. Price and availability subject to change.

Bottom line: The ASUS Prime B450M-K II (Socket AM4/B450/DDR4/S-ATA 600/Micro ATX) is a specs-and-price decision rather than a crowd-consensus one in the motherboards category, priced around $134.99. Check the specification table above against one or two close alternatives — on price and spec fit, not on star ratings.

Pros & Cons

Pros

✓ Comprehensive cooling: PCH heat sink and Xpert fan
✓ Ships via Amazon with Prime eligibility and the standard returns policy

Cons

✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified

The ASUS Prime B450M-K II is a Micro ATX Socket AM4 motherboard built for first-time Ryzen builders who want a dependable foundation without overspending. Rated 4.5 out of 5 stars across 2,207 reviews, it pairs the B450 chipset with DDR4 memory support and SATA 600 storage connectivity, plus a native M.2 slot when you want an NVMe boot drive instead of a spinning disk. Connectivity covers USB 3.2 Gen 1 Type-A and USB 3.1 Gen 2 ports along with 1GB Ethernet, so peripherals and networking are handled without add-in cards. ASUS pairs a PCH heat sink with Xpert fan controls to keep thermals in…

SpecPicks Verdict

SpecPicks scored ASUS Prime B450M-K II (Socket AM4/B450/DDR4/S-ATA 600/Micro ATX) using a rating × review-volume × price-fit model applied to our editorial and benchmark analysis across the motherboards category. Compare with similarly-priced alternatives in the motherboards category before committing. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for motherboards of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.

Frequently Asked Questions

What CPU socket does the ASUS Prime B450M-K II use?

It uses Socket AM4 with the AMD B450 chipset, so it accepts AM4 Ryzen processors. Check the ASUS CPU support list for your specific chip, since some newer AM4 CPUs require a BIOS update first.

Does this motherboard support M.2 NVMe drives?

Yes. ASUS lists native M.2 support alongside SATA 600 ports, so you can boot from an M.2 drive and add 2.5-inch or 3.5-inch SATA drives for bulk storage.

What size case do I need for this board?

It is a Micro ATX board, so it fits Micro ATX cases and any mid-tower or full-tower ATX case, which all include Micro ATX standoff mounting points.

Does it support DDR4 or DDR5 memory?

This board uses DDR4 memory. DDR5 is not supported on the AM4 platform, so plan your memory kit around DDR4 modules.

Can I connect RGB light strips to this motherboard?

Yes. There is an onboard ASUS Aura Sync header for RGB LED strips, and it syncs lighting effects with other Aura Sync-capable components in your build.

Key Features

Comprehensive cooling: PCH heat sink and Xpert fan
Ultra-fast connectivity: M.2 support, 1GB Ethernet and USB 3.2 Gen 1 Type-A
Ultrafast connectivity: Supreme flexibility with USB 3.1 Gen 2 and native M.2
ASUS Aura Sync header: Onboard connector for RGB LED strips, easily synced with an ever-growing portfolio of Aura Sync-capable hardware
5X Protection III: Multiple hardware safeguards for all-around system protection

Full Specifications

Brand	ASUS
USB 2.0	2
Platform	Windows 10, Windows 7
CPU Model	Intel Xeon
CPU Socket	Socket AM4
Model Name	Prime B450M-A
Chipset Type	AMD B450
Connectivity	USB
Model Number	90MB0YR0-M0EAY0
Item Type Name	ASUS PRIME B450M-A (Socket AM4/B450/DDR4/S-ATA 600/Micro ATX)
Mfr Part Number	PRIME B450M-A
Number of Ports	12
Total Usb Ports	8
Processor Socket	Socket AM4
Total PCIe Ports	3
Total SATA Ports	4
5X Protection III	Multiple hardware safeguards for all-around system protection
Compatible Devices	Desktop PC
Memory Clock Speed	3200 MHz
ASUS Aura Sync header	Onboard connector for RGB LED strips, easily synced with an ever-growing portfolio of Aura Sync-capable hardware

Ready to buy?

ASUS Prime B450M-K II (Socket AM4/B450/DDR4/S-ATA 600/Micro ATX) is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

View Current Price on Amazon →

*Price sourced from Amazon.com. Price data may not reflect current market pricing — verify on Amazon before purchase. Price and availability subject to change.