ASUS Prime B840M-A-CSM Motherboard Socket AMD AM5 (AMD B840, mATX, DDR5 Memory
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💡 How to pick a motherboard
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
FILTERS
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SORTVIEWProductSocketForm FactorChipsetWiFiValuePrice
ASUS★★★★4.3Sold by Bleepbox US via Amazon
AM5
mATX
B840
None
C
$242.99
2 stores
Specifications
SocketAM5
Form FactormATX
MemoryDDR5
RAM Slots4
Max RAM192
WiFiNone
Weight910 Grams
Model #PRIME B840M-A-CSM
UPC00192876915097
PERFORMANCE
64%
Buy Now
AmazonBEST
✓ In Stock
Sold by Bleepbox US via Amazon
$242.99
Buy →
Newegg3RD-PARTY SELLERUNCONFIRMED
✓ In Stock
$269.19
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Best Buy
Not tracked at this retailer
VALUE SCORE
C
10.5
Average value
Performance (64%) ÷ Price ($242.99) = 10.5
S ≥28 · A ≥20 · B ≥14 · C ≥8 · D <8
S ≥28 · A ≥20 · B ≥14 · C ≥8 · D <8
FUTURE-PROOFING
✅AM5 — supported through 2027+
✅DDR5 memory
CONSIDER INSTEAD
SAVE $147131% of this product's perf
MSI - Z790 GAMING PLUS WIFI (Socket LGA 1700) Intel Z790 ATX DDR5 Wi-Fi 6E Motherboard - Black
Socket
LGA1700
Chipset
Z790
Form
ATX
WiFi
WiFi 6
$95.99
+20% FASTER$147 cheaper
MSI - Z790 GAMING PLUS WIFI (Socket LGA 1700) Intel Z790 ATX DDR5 Wi-Fi 6E Motherboard - Black
Socket
LGA1700
Chipset
Z790
Form
ATX
WiFi
WiFi 6
$95.99