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ASRock B450M/AC AM4 AMD Promontory B450 SATA 6Gb/s Micro ATX AMD Motherboard

Ships from United States. Most customers receive within 5-9 days.

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  • AMD Promontory B450
  • Ryzen / Athlon Series
  • AMD Ryzen series CPUs (Matisse) support DDR4 3200/ 2933/ 2667/ 2400/ 2133 ECC & non-ECC, un-buffered memory
  • AMD Ryzen series CPUs (Pinnacle Ridge) support DDR4 3200+(OC)/ 2933(OC)/ 2667/ 2400/ 2133 ECC & non-ECC, un-buffered memory
  • AMD Ryzen series CPUs (Picasso) support DDR4 2933/ 2667/ 2400/ 2133 non-ECC, un-buffered memory
  • AMD Ryzen series CPUs (Summit Ridge) support DDR4 3200+(OC)/ 2933(OC)/ 2667/ 2400/ 2133 ECC & non-ECC, un-buffered memory
  • AMD Ryzen series CPUs (Raven Ridge) support DDR4 3200+(OC)/ 2933/ 2667/ 2400/ 2133 non-ECC, un-buffered memory

  • Overview
  • Specs
  • Warranty & Returns
  • Reviews
ASRock Logo
ASRock B450M_ac Motherboard Standing Up, Angled to the Right

ASRock B450M/ac Motherboard

Powered by the AMD B450M chipset, this motherboard works flawlessly with the latest 3rd generation AMD Ryzen processors based on Zen 2 micro architecture as well as 2nd/1st generation Ryzen processors. This micro ATX board has quad DIMM slots, dual PCIe x16 slots, an Ultra M.2 slot, and a GbE LAN port—enough for you to build a gaming rig or home entertainment PC. 802.11ac Wi-Fi and Bluetooth are built onboard for wireless convenience out of the box. Super Alloy guarantees unbeatable reliability and durability to withstand harsh environments. Moreover, you can connect RGB and addressable RGB gadgets, and synchronize them with Polychrome RGB Sync-certified accessories for unified, harmonious lighting that's awesome to behold.

  • AMD AM4 Socket
  • Supports DDR4 3200+ (OC)
  • 1x PCIe 3.0 x16, 1x PCIe 2.0 x16
  • AMD Quad CrossFireX
  • Graphics Output: HDMI
  • 7.1 CH HD Audio (Realtek ALC892 Audio Codec), ELNA Audio Caps
  • 4x SATA3, 1x Ultra M.2 (PCIe Gen3 x4)*
  • 6x USB 3.1 Gen1 (2x Front, 4x Rear)
  • Realtek Gigabit LAN
  • ASRock Polychrome SYNC
  • Actual support may vary by CPU.
 1_Polychrome RGB
Rule Your Own Lighting Way—Polychrome RGB

This motherboard features onboard RGB headers and an addressable RGB header that allow motherboard to be connected to compatible LED devices such as strip, CPU fans, coolers, chassis and so on. Users may also synchronize RGB LED devices across the Polychrome RGB Sync-certified accessories to create their own unique lighting effects.

The addressable RGB LED header supports WS2812B addressable RGB LED strip (5V/Data/GND), with a maximum power rating of 3A (5V), a max of 80 LEDs and length within 2 meters.

*The RGB LED header supports standard 5050 RGB LED strip (12V/G/R/B), with a maximum power rating of 3A (12V) and length within 2 meters.

Ultra M.2 SSD Slot on the ASRock B450M/AC AM4 Motherboard
Ultra M.2 32 Gb/s (PCIe Gen3 x4 & SATA 3)

The PCIe Gen3 x4 Ultra M.2 interface pushes data transfer speeds up to 32Gb/s. In addition, it also supports SATA3 6Gb/s M.2 modules, and is compatible with ASRock’s U.2 Kit for installing some of the world’s fastest U.2 PCIe Gen3 x4 SSDs.

Dual-Band 802.11ac WiFi Antenna on the ASRock B450M/AC AM4 Motherboard
Dual-Band 802.11ac WiFi

No one has time for weak WiFi signals and sluggish internet! That's why this motherboard comes with an 802.11ac WiFi (2.4G / 5G WiFi) module which supports wireless networks and Bluetooth v4.2.

USB 3.2 Gen1 Port
4x USB 3.2 Gen1

Delivering data transfer rates up to 10X faster than USB 2.0 with optimized power efficiency. USB 3.2 Gen1 technology advances the data transfer rate up to 5Gb/s. ASRock provides 4x USB 3.2 Gen1 ports onboard allowing you to have a stunning data transfer experience.

Graphic Text That Reads: Super Alloy Motherboard
Sapphire Black PCB Bottom-Right Corner of the ASRock B450M/AC AM4 Motherboard

Sapphire Black PCB

Pure-black PCB appearance. The new Sapphire Black PCB represents rock-solid quality and gives the motherboard a more mysterious touch.

High Density Glass Fabric PCB Versus Traditional

High-Density Glass Fabric PCB

High Density Glass Fabric PCB design reduces the gaps between the PCB layers to protect the motherboard against electrical shorts caused by humidity.

2oz Copper PCB Graphic

2oz Copper PCB

Using only carefully selected copper materials for PCB layers, 2oz Copper PCB delivers lower temperature and higher energy efficiency for overclocking.

ASRock B450M/AC AM4 Motherboard's ELNA Audio Caps

ELNA Audio Caps

Who says high quality audio is only available on high-end motherboards? ASRock applied ELNA audio capacitors on mainstream and entry-level motherboards! Compared with traditional solid caps, the leakage current of ELNA audio caps is merely 3uA. This is the key to reduce noise level significantly and satisfy even the pickiest audiophiles.

Full Spike Protection Logo

Full Spike Protection

Some sensitive digital components on the motherboard are vulnerable to power surges, and the excessive current may cause your system to malfunction immediately. ASRock Full Spike Protection includes various technologies to prevent your motherboard’s components from being damaged by these unexpected voltage spikes.

ASRock App Shop and Compatible Software Icons

Live Update & APP Shop

ASRock Live Update & APP Shop is designed for your convenience. We provide various apps and support software for users to download. You can also easily optimize your system and keep your motherboard up to date with ASRock Live Update & APP Shop.


Learn more about the ASRock B450M/AC

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years
  • Read full details
Ownership: 1 month to 1 year
Verified Owner
5/ 5
Easy to set up and looks great. 7/4/2020 3:39:31 AM

Pros: Works fine out of the box, no BIOS update needed for 3rd gen Ryzen.

Cons: Only 2 Chassis fan headers.

Overall Review: Recommended product.

Did you find this review helpful?
Anonymous
Ownership: 1 month to 1 year
Verified Owner
5/ 5
Great for the price 7/2/2020 12:42:48 AM

Pros: Wifi / Bluetooth
M.2 NVMe
4 slots for the RAM

Cons: None until now

Overall Review: It's a great motherboard for the price

Did you find this review helpful?
Ownership: 1 month to 1 year
Verified Owner
2/ 5
Stopped working after 2 months 6/18/2020 10:17:01 AM

Pros: Board small.
Has built in WIFI that works much better than I thought it would.

Cons: Very picky about RAM
Couldn't get it to post for a week but Ram was the issue.
Stopped working after 2 months of very light use.
One of the USB ports wouldn't work and I wasn't able to even get anything to plug into it.

Overall Review: Other than the RAM issue and it dying on me after 2 months the board worked fine.
Happy I got extended warranty but not even sure how to use it because newegg says its past return period. any help on this would be great.

Did you find this review helpful?
Manufacturer Response:
Dear Melissa,

Sorry for any inconvenience this may have caused you.
We will be more than happy to assist you if the mainboard is malfunctioned.
Please contact us at https://event.asrock.com/tsd.asp

Thank you

ASRock Support
Tech Support Email: https://event.asrock.com/tsd.asp
Ownership: 1 week to 1 month
Verified Owner
2/ 5
Nothing but a hassle. Get the gigabyte board instead. 6/17/2020 7:42:27 PM

Pros: -it works.

Cons: -socket placement is weird, but that depends on your case
-says it supports SATA m.2, but that's a blatant lie

Overall Review: Get a different board.

1 out of 1 people found this review helpful. Did you?
Manufacturer Response:
Dear Joshua,

Thank you for purchase and review.
The board only supports the NVME M.2 (PCIE type) drive.
Please visit link below for board's specification under Storage section.
Link: https://www.asrock.com/mb/AMD/B450Mac/index.us.asp#Specification

If you have any technical or warranty inquiry in the future, please contact us at https://event.asrock.com/tsd.asp
We will assist you shortly.

Thank you

ASRock Support
Tech Support Email: https://event.asrock.com/tsd.asp
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Perfect, light and powerfull. 6/17/2020 9:14:13 AM

Overall Review: This MB is very simpe to mount, light and a good deal for the price, I recommend.

Did you find this review helpful?
Anonymous
Ownership: 1 week to 1 month
Verified Owner
1/ 5
Head phone jacks and audio not working 6/16/2020 1:00:06 PM

Pros: None

Cons: Head phone jack didn’t work and cause my WiFi adapter to run slow.

Overall Review: Terrible I ordered this for my new pc running a Ryzen 5 3600 and the head phone jack didn’t work I tried everything from all the drivers asrock offered for this board and even got a professional computer tech to look at it and he said it was the mother board new egg won’t get in contact with me to get a refund.

Did you find this review helpful?
Manufacturer Response:
Dear Valued ASRock Customer,

Sorry for any inconvenience this may have caused you.
We will be more than happy to assist you.
Please contact us at https://event.asrock.com/tsd.asp

Thank you

ASRock Support
Tech Support Email: https://event.asrock.com/tsd.asp
Anonymous
Ownership: 1 day to 1 week
Verified Owner
5/ 5
I was surprised [ in a good way] 6/15/2020 9:43:14 PM

Pros: -Didn't expect to have that much VRM's for the price
-User manual is fantasticly translated
-No strength required to pull the CPU holding bracket (unlike Gigabytes board)
- PCI-e slots are well placed
-IO shield holes fit nicely

Cons: -Ram slots were pretty tight due to having only one side with clips
-could've had one or two more USB 3.0 port

Overall Review: An overall really impressive board. I was honestly surprised of how many VRM's there is on this board which offers lot more stability when overclocking and much cleaner power to the CPU.

Did you find this review helpful?
Ownership: 1 month to 1 year
Verified Owner
4/ 5
Great product, but cuts MAJOR features. 6/12/2020 6:57:12 AM

Pros: Asrock always has good quality components - We ONLY buy Asrock. This board is no exception, with regards to quality.

Cons: Product has only ONE video output - HDMI.
Missing USB Type-C.
6 Onboard USB, the rest are on headers.

Overall Review: I would not recommend this board for most users - I wish I had noticed it was missing the video outputs and other features of the similar PRO4 board.

Did you find this review helpful?
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