ASRock B450M/AC R2.0 AM4 AMD Promontory B450 SATA 6Gb/s Micro ATX AMD Motherboard

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What to look for:
  • Socket matches your CPU (AM5, LGA1851, etc.)
  • Form factor fits your case (ATX, mATX, ITX)
  • RAM type (DDR4 or DDR5) and slot count
💰 Budget: $100-$150. Mid-range: $180-$280. High-end: $300+ with WiFi, PCIe 5.0
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ProductSocketForm FactorChipsetWiFiValuePrice
B450M/AC R2.0 AM4 AMD Promontory B450 SATA 6Gb/s Micro ATX AMD Motherboard Motherboard
B450M/AC R2.0 AM4 AMD Promontory B450 SATA 6Gb/s Micro ATX AMD Motherboard
ASRock★★★★★4.5
AM4
mATX
B450
None
A
$79.99
Specifications
asinB09KZYMP8P
reviews223
Model #B450M/AC R2.0
Weight1011 Grams
SocketAM4
MemoryDDR4
Max RAM128
RAM Slots2
Form FactormATX
WiFiNone
value100
UPC04710483932809
PERFORMANCE
51%
Customer Reviews★★★★★4.8 · 5 reviews
★★★★★Worked well
Arrived quickly, worked flawlessly. Well packaged.
JacN · 2026-03-16 · via bestbuy
★★★★★definitely recommend
Good motherboard, like the quality of it, have no issues, shipping was quick, installing was quick, looks really nice. 10/10
Mezzerely · 2025-11-26 · via amazon
★★★★★Works with Ryzen 5 series out of the box
This board is great for the price. My 5600x and team group ddr4 3200 cl16 vengeance ram 2x16gb (xmp) worked perfect out of the box. Supports. Resizeable Bar, PBO 2 , undervolting, overclocking etc. The bios has a ton of options. The heatsinks are heavy, surprisingly heavy. Comes with backplate. The only negatives are the lack of PWM fan headers (1) + CPU PWM header (there's also 1 3pin fan header but no fan control using it). And, no USB 3.0 support.
Joseph Baty · 2023-06-19 · via amazon
★★★★★Works well
Works for Am4 2000 series. Omen pre builds try to pair 2000 series with B550 and its not so great.
Joseph Read · 2026-04-10 · via amazon
★★★★★Awesome socket AM4 motherboard; low price, good performance.
This time around is my 2nd build in 2023 using this ASRock B450M. So far, with 4th gen Ryzen 5 4600g, and 5th gen Ryzen 7 5700g, this board seems to perform pretty well. It arrived safely packed inside an Amazon box. My only concern was the seal on the motherboards box itself was broken when I got it. Thought that was weird for a new product, usually open boxes get some type of discount. Doesn't appear to be anything missing and the motherboard is functioning fine, but still curious about the broken seal in the end. Definitely a solid option for those looking for components on a very limited budget. Both of my builds with this board were <$700.
BallistiCoin · 2023-09-10 · via amazon
Buy Now
Amazon
✓ In Stock
$79.99
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Newegg
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Newegg (Open Box)
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VALUE SCORE
A
25.5
Great value
Performance (51%) ÷ Price ($79.99) = 25.5
S ≥28 · A ≥20 · B ≥14 · C ≥8 · D <8
FUTURE-PROOFING
⚠️AM4 — end of life, no CPU upgrade path
⚠️DDR4 only — no DDR5 upgrades
B450M/AC R2.0 AM4 AMD Promontory B450 SATA 6Gb/s Micro ATX AMD Motherboard Motherboard
CONSIDER INSTEAD
SAVE $14.989999999999995118% of this product's perf
MSI B450 Tomahawk MAX II
Socket
AM4
Chipset
B450
Form
ATX
WiFi
None
$65
+31% FASTERfor $1 more
B850 Eagle WIFI6E AMD AM5 ATX Motherboard, Support AMD Ryzen 9000/8000/7000 Series, DDR5
Socket
AM5
Chipset
B850
Form
ATX
WiFi
WiFi 6E
$80.99