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Green rectangular micro-ATX board with silver heatsinks and black slots

ASUS

ASUS Prime B450M-A II AMD AM4 AMD motherboard

SKU CH-VTNA-1WTJK

Micro-ATX board for AM4 Ryzen CPUs with four DDR4 slots up to 128 GB, PCIe 3.0 x16, M.2, USB 3.2 Gen 2 and HDMI 2.0b

  • ProcessorAMD AM4 Socket for 3rd/2nd/1st Gen AMD Ryzen / 2nd and 1st G
  • ChipsetAMD B450
  • Form factorMicro ATX
  • CPU socketAM4
  • Memory slot count4 × 288pin (DDR4)
  • Supported memoryDDR4 4400(O.C.)/ 4000(O.C.)/ 3866(O.C.)/ 3733(O.C.)/ 3600(O.
  • Supports Ryzen 5000 and earlier AM4 processors
  • USB 3.2 Gen 2 delivers 10Gbps transfer speed
  • Four DDR4 slots accept up to 128GB at 4400 O.C.
  • VRM and PCH heatsinks with thermal pads improve cooling
  • LANGuard, DRAM overcurrent and overvoltage protection increase durability

AM4 Socket and Ryzen Support

The ASUS Prime B450M-A II uses the AMD B450 chipset and an AM4 socket that accepts Ryzen 5000 series and 3rd, 2nd, and 1st Gen Ryzen processors. Four DDR4 slots support up to 128 GB of memory with overclocked speeds reaching 4400 MHz. The board targets builders who want a compact micro-ATX foundation for productivity or general computing.

Connectivity and Build Features

A single M.2 socket takes 2242, 2260, 2280, and 22110 drives in both SATA and PCIe 3.0 x4 modes, while six SATA 6 Gb/s ports handle additional storage. Video output relies on the processor and provides HDMI 2.0b, DVI-D, and D-Sub ports. Rear USB includes 3.2 Gen 2 at 10 Gbps. VRM and PCH heatsinks with thermal pads manage heat, and stainless-steel back I/O plus LANGuard and SafeSlot Core protections reinforce durability.

PCIe 3.0 and 1 Gbps LAN Limits

The primary PCIe 3.0 x16 slot runs at x16 with 3rd Gen Ryzen and drops to x8 with 2nd and 1st Gen Ryzen, while Athlon CPUs limit it further. Two PCIe 2.0 x1 slots handle add-in cards. Networking is handled by a Realtek RTL8111H controller capped at 1 Gbps. Memory overclocks above 2666 MHz are not guaranteed and depend on the specific CPU and DIMM combination.

How it compares

Measured against everything we stock in Motherboards for AMD CPUs, at today’s prices. Recalculated every night.

Price $80.99
Cheaper than about 82% of the 1,906 comparable items (median $224.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameASUS
Model namePrime B450M-A II
Processor
ProcessorAMD AM4 Socket for 3rd/2nd/1st Gen AMD Ryzen / 2nd and 1st Gen AMD Ryzen with Radeon Vega Graphics / Athlon with Radeon Vega Graphics Processors *
* Refer to www.asus.com for CPU support list
CPU socketAM4
ChipsetAMD B450
Memory
Memory slot count4 × 288pin (DDR4)
Max supported RAM128 GB
Memory channelsDual Channel
Storage
SATA ports6 x SATA 6Gb/s
M.2 slots3rd/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 2242/2260/2280/22110 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 2242/2260/2280/22110 storage devices support (SATA mode)
* The M.2 slot shares bandwidth with the SATA6G_5/6 ports, and therefore the SATA6G_5/6 ports cannot be used when an M.2 device is installed.
SATA and RAID support0/1/10
Audio & video
Audio chipRealtek High Definition Audio CODEC
Sound channels7.1 Channels
Connectivity
Ethernet controllerRealtek RTL8111H
Maximum network speed1 Gbit/s
Ports & slots
PCIe x16 slotsNone
PCIe x1 slots2 x PCI Express 2.0 x1 slots
HDMI ports1 x HDMI
USB 3.0 ports3 x USB 3.0
Power
Power connectors1 × 24-pin EATX Power connector(s)
1 × 8-pin ATX 12 V Power connector(s)
Size & build
Form factorMicro ATX
Width and length9.6 in × 9.5 in
Compatibility
Windows 11 supportSupported
In the box
In the boxAccessories:
User's manual
I/O Shield
2 x SATA 6Gb/s cable(s)
1 x M.2 Screw Package
1 x Supporting DVD
More details
LightingRGB

Questions about this item

What PCIe generation and lane width does the single M.2 socket on this Prime B450M-A II actually deliver?

The M.2 Socket 3 with M key runs at PCIe 3.0 x4 and accepts 2242, 2260, 2280 and 22110 modules.

What board size and mounting pattern does this micro-ATX motherboard use?

It follows the micro-ATX form factor with the standard four mounting holes for that size.

How do you update the BIOS on this board without a supported CPU installed?

Use the BIOS Flashback button on the rear I/O: copy the renamed BIOS file to a FAT32 USB stick, plug it into the dedicated port, press the button and wait for the LED to finish blinking.

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