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ATX motherboard, dark PCB with silver heatsinks, AM5 socket, four DDR5 slots, PCIe 5.0 x16, no antenna

ASUS

ASUS PRIME B850-PLUS WIFI DDR5 Desktop Motherboard

SKU CH-C4WQ-Z40MV

Supports AMD Ryzen CPUs on the B850 chipset with four DDR5 slots up to 256 GB and a PCIe 5.0 x16 slot

  • CPU Socket TypeAM5
  • CPU TypeRyzen Series
  • Form FactorATX
  • AM5 socket supports Ryzen CPUs for high performance
  • B850 chipset enables PCIe 5.0 x16 graphics bandwidth
  • Four DDR5 slots accept up to 256GB memory
  • ATX form factor fits standard desktop cases
  • Includes I/O shield, two SATA cables and M.2 hardware

AM5 DDR5 ATX Motherboard

The ASUS Prime B850-PLUS WIFI is an ATX board built around the B850 chipset for AMD Ryzen processors on socket AM5. It provides four DDR5 memory slots with a maximum capacity of 256GB. The layout targets serious gaming builds that need a full-size form factor.

Sustained Load Behaviour

The PCI Express 5.0 x16 slot delivers 5.0 signalling for graphics cards and high-throughput add-in cards under continuous load. Four DDR5 slots allow memory to run at rated speeds without downclocking when all are populated. The ATX power delivery design supports extended gaming sessions without throttling.

Interface Practical Limits

DDR5 memory tops out at 256GB across the four slots, defining the ceiling for multitasking and content workloads. The single PCI Express 5.0 x16 slot limits expansion to one full-bandwidth device at 5.0 speeds. Two SATA ports restrict high-capacity storage arrays to a pair of drives.

Highlights

  • AM5 socket supports Ryzen CPUs for high performance
  • B850 chipset enables PCIe 5.0 x16 graphics bandwidth
  • Four DDR5 slots accept up to 256GB memory
  • ATX form factor fits standard desktop cases
  • Includes I/O shield, two SATA cables and M.2 hardware

Specifications

BrandASUS
ModelPRIME B850-PLUS WIFI MRN7
CPU Socket TypeAM5
CPU TypeRyzen Series
Form FactorATX

Questions about this item

Will I need to supply my own Wi-Fi antenna?

Yes, the board does not come with an antenna; you must provide a compatible external antenna to use the wireless feature.

Which memory kits are supported and how much total capacity can I install?

The board has four DDR5 slots and supports up to 256 GB of total memory.

What CPU coolers will fit this ATX board?

Any cooler rated for the AM5 socket and within your case’s height clearance will mount correctly.

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