StoreDeal.ai store
Shop
  • Deals
  • Deal checker
  • Black Friday
  • Buying guides
  • Brands
  • Stores
Travel
  • Flight deals
  • Hotel deals
Company
  • Research
  • Press
  • Use in AI assistants
  • Contact
  • deal.ai apps
Black Friday 2026
  • Walmart
  • Best Buy
  • Target
  • TVs
  • Laptops
  • Headphones
  • Apple
  • Gaming
  • Vacuums
  • Kitchen
  • Toys
  • Smartwatches
  • Tablets
  • Furniture
  • Mattresses
© Deal.ai Inc.·2222 Ponce de Leon Blvd, Miami, FL 33134·support@deal.ai
TermsPrivacy
Deal.ai › ASUS › PC Gaming
ASUS
Asus Prime B850M-A WIFI-CSM Gaming Desktop Motherboard

Asus Prime B850M-A WIFI-CSM Gaming Desktop Motherboard

Best price now

$179.99at WalmartChecked Nov 10

Prices are checked against each store and labelled with when.

Visit Walmart
ASUS discount code →

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Enter to send, Shift+Enter for a new line

Price facts

  • Last seen at $179.99 at Walmart on Nov 10.

Our take on the Asus Prime B850M-A WIFI-CSM Gaming Desktop Motherboard

The Asus Prime B850M-A WIFI-CSM is a micro ATX AM5 motherboard built on AMD's B850 chipset. It pairs a 9.6-inch square board with four DDR5 slots, three M.2 slots, PCIe 5.0 for the graphics card, Wi-Fi 6E and 2.5Gb Ethernet. It suits builders who want a compact Ryzen 7 or Ryzen 9 system with current connectivity and room to expand. Against pricier X870 boards it gives up some USB4 and lane flexibility, but covers the essentials for most gaming and productivity builds.

Best forCompact micro ATX Ryzen buildsGamers who want PCIe 5.0 graphicsBuilders needing built-in Wi-Fi and 2.5Gb EthernetMulti-drive setups with three M.2 slots
Pros
  • PCIe 5.0 x16 slot for current graphics cards
  • Three M.2 slots plus four SATA ports
  • Wi-Fi 6E and 2.5Gb Ethernet built in
  • Four DDR5 slots supporting up to 256 GB
  • ECC memory support and RAID 0/1/5/10
  • 7.1-channel audio with S/PDIF output
Cons
  • No USB4 or Thunderbolt
  • Micro ATX limits expansion versus full ATX
  • Only four rear USB 2.0 ports and eight USB ports total
  • Onboard video depends on a Ryzen chip with integrated graphics

Asus Prime B850M-A WIFI-CSM Gaming Desktop Motherboard prices at every store

  • WalmartNew

    In stockSold by Beach Audio IncReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $179.99Free shippingChecked Nov 10
    Visit Walmart

About the Asus Prime B850M-A WIFI-CSM Gaming Desktop Motherboard

The Asus Prime B850M-A WIFI-CSM is a Micro ATX gaming desktop motherboard built on the AMD B850 chipset. It has a Socket AM5 processor socket and supports Ryzen 7 and Ryzen 9 processors. Video output depends on the CPU.

It has 4 DIMM slots for DDR5 memory, up to 256 GB, at speeds up to 8000 MHz. Storage connects through 4 SATA interfaces and 3 M.2 interfaces, with RAID levels 0, 1, 5 and 10 supported.

Networking includes 2.5 Gigabit Ethernet, Wi-Fi (IEEE 802.11ax) and Bluetooth 5.3. The board has three PCI Express x16 slots that support PCI Express 4.0 and 5.0.

Chipset
AMD B850
Socket
Socket AM5, 1 processor supported
Processors
Ryzen 7, Ryzen 9
Memory
4 x DIMM (UDIMM) slots, DDR5 SDRAM, up to 256 GB
Memory speed
Up to 8000 MHz
Error checking
ECC
Storage
4 x SATA, 3 x M.2; Serial ATA/600
RAID
Levels 0, 1, 5, 10
Expansion slots
3 PCI Express x16 slots (PCI Express 4.0, PCI Express 5.0)
Video
CPU-dependent onboard video; HDMI 2.1, DisplayPort
Audio
7.1 channels; S/PDIF
Ethernet
Gigabit Ethernet, 2.5 Gigabit Ethernet
Wireless
Wi-Fi IEEE 802.11ax, Bluetooth 5.3
USB ports
8 total, including 4 x USB 2.0
Onboard USB
7 total, including 4 x USB 2.0
Onboard headers
S/PDIF header
Form factor
Micro ATX
Dimensions
9.6" wide x 9.6" deep
Compatibility
AMD

Questions and answers

Which CPUs does this board support?
It uses the AM5 socket and the B850 chipset, listed for Ryzen 7 and Ryzen 9 processors. Check Asus's CPU support list for the exact model before buying.
How much memory can it take?
Four DIMM slots hold up to 256 GB of DDR5, with speeds listed up to 8000 MHz. ECC memory is supported.
Does it have Wi-Fi and Ethernet?
Yes. It has Wi-Fi 6E (802.11ax) and Bluetooth 5.3, plus 2.5Gb and Gigabit Ethernet ports.
How many drives can I install?
Three M.2 slots and four SATA ports, with RAID 0, 1, 5 and 10 supported.
Will it fit my case?
It is micro ATX at 9.6 by 9.6 inches, so it fits micro ATX and most ATX cases. Check clearance for a long graphics card and tall CPU coolers.
Do I need a graphics card?
Onboard video depends on the CPU. Ryzen chips without integrated graphics need a discrete card.
Where is the Asus Prime B850M-A WIFI-CSM Gaming Desktop Motherboard cheapest?
At Walmart, for $179.99, as of our latest check.

More from ASUS

  • A
    ASUS ROG STRIX B550-A GAMING ATX AM4 Motherboard
    ASUS ROG STRIX B550-A GAMING ATX AM4 Motherboard
  • A
    ASUS TUF GAMING B550-PLUS WIFI II Motherboard
    ASUS TUF GAMING B550-PLUS WIFI II Motherboard
  • A
    Asus TUF Gaming A520M-PLUS II Motherboard
    Asus TUF Gaming A520M-PLUS II Motherboard
  • M
    Motherboard Fit for X570 Motherboard AM4 Prime X570-PRO
    Motherboard Fit for X570 Motherboard AM4 Prime X570-PRO
  • A
    ASUS TUF GAMING X570-PLUS (WI-FI)
    ASUS TUF GAMING X570-PLUS (WI-FI)
  • A
    ASUS PRIME B550M-A/CSM Motherboard
ASUS PRIME B550M-A/CSM Motherboard
  • A
    ASUS ROG Strix B450-F Gaming Socket AM4 AMD B450 Motherboard
    ASUS ROG Strix B450-F Gaming Socket AM4 AMD B450 Motherboard
  • A
    ASUS PRIME B550M-K AMD B550 AM4 Micro ATX Motherboard
    ASUS PRIME B550M-K AMD B550 AM4 Micro ATX Motherboard
  • All ASUS deals and products →

    More motherboards

    • B
      Biostar B450MH AM4 Micro ATX Motherboard
      Biostar B450MH AM4 Micro ATX Motherboard
    • M
      MSI B550-A Pro AMD AM4 ATX Motherboard
      MSI B550-A Pro AMD AM4 ATX Motherboard
    • A
      ASRock B550M Pro4 Motherboard
      ASRock B550M Pro4 Motherboard
    • A
      ASRock B450M-HDV AMD B450 AM4 Micro ATX DDR4 Motherboard
      ASRock B450M-HDV AMD B450 AM4 Micro ATX DDR4 Motherboard
    • M
      MSI MAG B550M Mortar WIFI Motherboard
      MSI MAG B550M Mortar WIFI Motherboard
    • G
      Gigabyte B650 AORUS Elite AX AM5 ATX Motherboard
      Gigabyte B650 AORUS Elite AX AM5 ATX Motherboard
    • M
      MSI MAG B550 TOMAHAWK Motherboard
      MSI MAG B550 TOMAHAWK Motherboard
    • G
      GIGABYTE B550 Eagle WIFI6
      GIGABYTE B550 Eagle WIFI6