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Deal.ai › ASUS › Motherboards
ASUS
ASUS Prime B840M-A-CSM

ASUS Prime B840M-A-CSM

Best price now

$177.13at AsusChecked Nov 10

Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.

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Price facts

  • Last seen at $177.13 at Asus on Nov 10.

Our take on the ASUS Prime B840M-A-CSM

The ASUS Prime B840M-A-CSM is a micro-ATX AM5 motherboard for AMD Ryzen 7000, 8000 and 9000 chips, built on the mainstream B840 chipset. It carries four DDR5 slots rated to 7600 MHz, one PCIe 4.0 x16 slot, two PCIe x1 slots, four SATA ports and M.2 storage, plus HDMI 2.1 and DisplayPort 1.4 outputs for a CPU with integrated graphics. It is a no-frills board aimed at office, home and budget gaming builds, and it trades the PCIe 5.0 lanes and extra USB of pricier B850 and X870 boards for a simpler, sturdier feature set. The CSM suffix means corporate stable model supply, which matters to system builders who need long availability rather than overclocking headroom.

Best forBudget AM5 gaming buildsOffice and home PCsSystem integrators needing long model availabilityBuilds with a Ryzen chip that has integrated graphics
Pros
  • Four DDR5 slots with high rated memory speed
  • HDMI 2.1 and DisplayPort 1.4 outputs for integrated graphics
  • Four SATA ports plus M.2 storage
  • Addressable RGB header and four 4-pin fan headers
  • Micro-ATX size fits most cases
  • CSM model for stable long-term supply
Cons
  • PCIe 4.0 only, no PCIe 5.0 lanes
  • No Bluetooth and no Wi-Fi onboard
  • Single CPU fan header
  • No USB4 or high-speed USB-C front header
  • B840 chipset limits overclocking and lane count versus B850

ASUS Prime B840M-A-CSM prices at every store

  • AsusNew

    In stock

    $177.13+ $7.86 shippingChecked Nov 10
    Visit Asus

Store links may earn us a commission. Price via Klarna.

ASUS Prime B840M-A-CSM price history

Lowest price we've seen: $177.13 on Nov 10 at Asus. Tracked across 1 store since Nov 10.

Specifications

Connections
USB-C, 1/8" Headphone Jack, HDMI, USB-A, PS/2, DisplayPort, RJ45 (LAN)Source
Memory Type
DDR5Source
Memory Speed (max) (MHz)
7600Source
Processor Support AMD
Ryzen 3, Athlon, Ryzen 5, Ryzen 7Source
Integrated Processor
NoSource
Number of 24-pin ATX (pcs)
1Source
HDMI Version
2.1Source
M.2 Key Type
M KeySource
Number of PCIe x16 (pcs)
1Source
RAID Controller
YesSource
Type of RAID
RAID 10, RAID 0, RAID 1Source
Socket AMD
Socket AM5Source
Cooling
PassiveSource
Memory Size (max)
256 GBSource
SATA Version
SATA III (6.0 Gbit/s)Source
PCIe Version
4.0Source
DisplayPort Version
1.4Source
Number of SATA (pcs)
4Source
No. of RJ45 (LAN)
1Source
No. of USB-C (pcs)
1Source
Bluetooth
NoSource
M.2 Form Factor
2280, 2242, 2260Source
Processor
AMDSource
Memory Slots
4Source

Questions and answers

Which CPUs does this board support?
It uses the AM5 socket and lists Ryzen 3, 5 and 7 plus Athlon support. Ryzen 7000, 8000 and 9000 desktop chips fit, but check the ASUS CPU support list for the exact model.
Do I need a graphics card?
Only if your CPU lacks integrated graphics. The board has HDMI 2.1 and DisplayPort 1.4 outputs, so a Ryzen chip with built-in graphics can drive a display directly.
How much memory can it take?
Four DDR5 slots hold up to 256 GB, with memory speeds rated to 7600 MHz. Higher speeds depend on the kit and the CPU's memory controller.
Is PCIe 5.0 supported?
No. The main x16 slot and M.2 run PCIe 4.0, which is enough for current graphics cards and SSDs but below B850 and X870 boards.
Does it have Wi-Fi or Bluetooth?
No. Networking is a single RJ45 LAN port, so add a Wi-Fi card or USB adapter if you need wireless.
What is the CSM suffix?
CSM stands for Corporate Stable Model. ASUS guarantees a longer, more stable supply and support window, which suits businesses and system builders rather than enthusiasts.
Where is the ASUS Prime B840M-A-CSM cheapest?
At Asus, for $177.13, as of our latest check.

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