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Green micro-ATX board with AM4 socket, two DDR4 slots, four SATA ports, one M.2 slot, DVI and VGA outputs, Realtek audio and LAN chips

ASUS

ASUS PRIME B350M-K AMD motherboard AM4 B350 chipset

SKU CH-Q1FX-1TX30

Micro-ATX AM4 board with dual-channel DDR4 up to 32 GB, one PCIe 3.0 x16 slot, two PCIe 2.0 x1 slots, four SATA 6 Gb/s ports, one M.2 socket supporting 2242/2260/2280 drives.

  • ProcessorAMD AM4 Socket for AMD Ryzen/ 7th Generation A-series/Athlon
  • ChipsetAMD B350
  • Form factorMicro ATX
  • CPU socketAM4
  • Memory slot count2 × 288pin (DDR4)
  • Supported memoryAMD Ryzen Processors DDR4 3200(O.C.)/ 2933(O.C.)/ 2666/ 2400
  • Supports Ryzen and 7th Generation A-series processors on AM4 socket
  • Dual-channel DDR4 memory up to 32 GB with 3200 MHz overclocking
  • PCIe 3.0 x16 slot plus two PCIe 2.0 x1 slots for expansion
  • Four SATA 6 Gb/s ports and one M.2 socket supporting 2242 2260 2280 drives
  • Realtek ALC887 8-channel audio and RTL8111H Gigabit LAN onboard

Socket AM4 Foundation

The ASUS PRIME B350M-K is a micro-ATX motherboard built around the AMD B350 chipset for Socket AM4 processors. It accepts AMD Ryzen CPUs as well as 7th Generation A-Series and Athlon APUs, giving system builders a compact platform for mainstream desktop computing.

Memory And Storage Flexibility

Two 288-pin DDR4 slots support dual-channel memory up to 32 GB with speeds of 3200 and 2933 via overclocking plus native 2666, 2400 and 2133 operation. One M.2 Socket 3 with M key accepts 2242, 2260 and 2280 drives in both SATA and PCIe 3.0 x4 modes, while four SATA 6 Gb/s ports provide additional storage connectivity with RAID 0, 1 and 10 support.

Connectivity And Display Options

Realtek ALC887 delivers 8-channel audio and Realtek RTL8111H provides 1 Gbps LAN for everyday networking. Legacy PS/2 keyboard and mouse ports remain for older peripherals. Integrated Radeon graphics on supported APUs drive DVI-D and RGB outputs at up to 1920 x 1200 at 60 Hz, covering basic display needs without a discrete card.

How it compares

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

Price $54.99
Cheaper than about 90% 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 B350M-K
Processor
ProcessorAMD AM4 Socket for AMD Ryzen/ 7th Generation A-series/Athlon Processors
CPU socketAM4
ChipsetAMD B350
Memory
Memory slot count2 × 288pin (DDR4)
Max supported RAM32 GB
Memory channelsDual Channel
Storage
SATA ports4 x SATA 6Gb/s port(s), gray
M.2 slotsAMD Ryzen Processors:
1 x M.2 Socket 3, with M key, type 2242/2260/2280 storage devices support (SATA & PCIE 3.0 x4 mode)
AMD 7th Generation A-series/Athlon Processors:
1 x M.2 Socket 3, with M key, type 2242/2260/2280 storage devices support (SATA mode)
SATA and RAID support0/1/10
Audio & video
Audio chipRealtek ALC887
Sound channels8 Channels
Connectivity
Ethernet controllerRealtek RTL8111H
Maximum network speed1 Gbit/s
Ports & slots
PCIe 3.0 x16 slotsAMD Ryzen Processors
1 x PCIe 3.0/2.0 x16 (x16 mode)
AMD 7th Generation A-series/Athlon Processors
1 x PCIe 3.0/2.0 x16 (x8 mode)
PCIe x1 slots2 x PCIe 2.0 x1
PS/2 ports1 x PS/2 keyboard (purple)
1 x PS/2 mouse (green)
Video connectors1 x DVI-D
1 x D-Sub
Ethernet port1 x RJ45
USB 3.1 ports4 x USB 3.1 Gen 1 (blue)
USB 2.0 ports2 x USB 2.0
Audio jacks3 Ports
Onboard USB headers1 x USB 3.1 Gen 1 connector(s) support(s) additional 2 USB 3.1 Gen 1 port(s) (19-pin)
2 x USB 2.0 connector(s) support(s) additional 4 USB 2.0 port(s)
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 length8.9 in × 8.7 in
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

Questions about this item

What memory speed and capacity limits will I hit if I fill both DDR4 slots on this PRIME B350M-K?

The board supports up to 32 GB across its two DDR4 slots and runs memory at 3200 MHz when overclocked with Ryzen CPUs; with 7th Gen A-series or Athlon processors the maximum supported speed drops to 2400 MHz.

Which PCIe lane budget runs out first when I add a graphics card and an M.2 drive under sustained load?

With a Ryzen CPU the primary x16 slot runs at full x16 speed and the M.2 socket uses a separate four-lane PCIe 3.0 link, so neither saturates the other; with 7th Gen A-series or Athlon CPUs the x16 slot drops to x8 while the M.2 still keeps its four lanes.

How loud and hot does the Realtek RTL8111H gigabit LAN chip get when the board runs all day at 1 Gbps?

The RTL8111H is a low-power controller that stays cool and silent under continuous gigabit traffic; the board has no active cooling on the LAN chip, so it relies on case airflow and adds no audible noise.

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