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ASRock B450M Pro4 Micro ATX AM4 Motherboard

(136 Ratings, 4.6 Average)

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Specifications

Manufacturer

ASRock

Model

B450M Pro4

Part #

  • B450M PRO4
  • 90-MXB8F0-A0UAYZ

Socket / CPU

AM4

Form Factor

Micro ATX

Chipset

AMD B450

Memory Max

128 GB

Memory Type

DDR4

Memory Slots

4

Memory Speed

  • DDR4-2133
  • DDR4-2400
  • DDR4-2666
  • DDR4-2933
  • DDR4-3200

Color

Black / Silver

SLI/CrossFire

CrossFire Capable

PCIe x16 Slots

2

PCIe x1 Slots

1

M.2 Slots

  • 2242/2260/2280 M-key
  • 2230/2242/2260/2280 M-key

SATA 6.0 Gb/s Ports

4

Onboard Ethernet

1 x 1 Gb/s Ports

Onboard Video

Depends on CPU

USB 2.0 Headers

2

USB 3.2 Gen 1 Headers

1

Supports ECC

No

Wireless Networking

None

RAID Support

Yes

Uses Back-Connect Connectors

No

Price History

    * Amazon pricing is not included in price history graphs.

    Reviews

    leathernike
    • 7 points
    • 1 month ago

    from completed build Personal Computer

    Sort of your standard first build motherboard I think. Will be upgraded along with the CPU and GPU.

    Forsakenn
    • 9 points
    • 3 months ago

    from completed build Black Mamba v3 (2025)

    Still the GOAT. Had to update to a beta version Bios in order to use the 5700X3D, and this is my only problem with it. That being said though, I'm still giving it 5 stars, because I've had 0 issues with the latest (P10.31) Bios.

    FreySniper
    • 7 points
    • 3 months ago

    from completed build Ice

    No complaints. The BIOS never failed me. Word of caution though, make sure the case you put it in has enough wiggle room for cables. Took me ages to take the 12 pin cable out of the board with big hands.

    Trailminer
    • 4 points
    • 9 months ago

    from completed build AM4's Last Stand

    Extremely budget tier B450 board that still has enough fan headers to keep me happy. Bit disappointed that the second SSD slot isn't NVME, though.

    TrinnhyTrinhTrinh
    • 5 points
    • 1 year 3 months ago

    -Lots of fan headers.

    -Limited to PCIe 3.0 x16 GPU and PCIe Gen3 x4 M.2 NVMe.

    -Second M.2 only supports SATA III.

    -Requires aftermarket WIFI/Bluetooth adapter.

    -No RGB on board but it does have headers for them.

    Berniejo
    • 3 points
    • 1 year 8 months ago

    from completed build First build

    its a motherboard. sadly no wifi and bluetooth

    larrypotaot
    • 3 points
    • 1 year 10 months ago

    Works fine, but bios was kinda hard for a beginner to figure out. Did everything I needed though.

    HeadEmptyOnlyCheese
    • 6 points
    • 2 years 2 months ago

    from completed build Thrifty shopping pc

    Good. Has good IO and works wonders for the $85 price. Solid build quality.

    parrais
    • 6 points
    • 2 years 8 months ago

    from completed build The PC of Theseus

    Original part of build in Aug 2018

    A budget mATX board at the time, which has stood the test of time remarkably. The on-board audio is lacklustre (I've needed to use a USB sound card to avoid my headphone output echoing back through the microphone input) and the BIOS is not at all intuitive. But the fact that a budget 2018 motherboard can support a CPU released in April 2022 (including features like PBO and Resizable BAR) is very impressive.

    DGAF_AK87
    • 2 points
    • 2 years 11 months ago

    from completed build The Micro Toaster 2.0

    Decent board, many pitfalls for me IMO. Won't any ram kit past 3200 and when I originally got the board back in 2019. AsRock didn't send any m.2 screws, this is the last AsRock I will buy from them.

    Builds Using This Part

    • papitsupapitsu

      My first build – Clean and silvery mATX

      • AMD Ryzen 5 2600
      • GeForce GTX 1050 Ti

      kr2461.00+

    • SpiralCaseModsSpiralCaseMods

      $400 Budget Build - Project Skellington

      • AMD Ryzen 5 1600
      • Radeon RX 570

    • SpiralCaseModsSpiralCaseMods

      Project Rally Lightning - $500 Budget Build

      • AMD Ryzen 5 2600
      • Radeon RX 590

      kr797.00+