Asus Prime B840-Plus WiFi

Name: Asus Prime B840-Plus WiFi
Brand: Asus
SKU: 9932

Manufacturer: Asus

The Asus Prime B840-Plus WiFi is an ATX form factor motherboard built around AMD's AM5 platform and the B840 chipset. It comes with integrated Wi-Fi 6E and Bluetooth 5.3, along with RGB lighting, a dual BIOS setup, and a clear CMOS button that makes BIOS recovery straightforward. The board carries a 3-year warranty and measures 305 mm × 244 mm, fitting standard mid-tower and full-tower cases without issue.

Memory support runs on DDR5 across four slots in a dual-channel configuration, reaching up to 192 GB and accommodating overclocked profiles up to 7600 MHz. Expansion is handled by one PCIe 4.0 x16 slot alongside three PCIe 3.0 x16 slots, and storage options include three M.2 sockets, four SATA 3 connectors, and full RAID 0, 1, 5, and 10 support. The rear I/O offers a mix of USB 3.2 Gen 2 Type-A and Type-C ports, four USB 2.0 ports, HDMI 2.1, one DisplayPort output, a single RJ45 port, and three audio connectors feeding a 7.1-channel audio solution.

Pros

Supports Wi-Fi 6E and Bluetooth 5.3, covering modern wireless connectivity without needing a separate adapter
Dual BIOS provides a backup firmware chip, reducing the risk of a failed update bricking the board
Four DDR5 slots with support for up to 192 GB and overclocked speeds reaching 7600 MHz offers substantial memory headroom
Three M.2 sockets alongside four SATA 3 connectors give plenty of storage installation options
Six fan headers allow for a reasonably detailed cooling layout across the chassis
RAID 0, 1, 5, and 10 support adds flexibility for users who want redundancy or striped storage configurations

Cons

No PCIe 5.0 x16 slot, limiting compatibility with the fastest current-generation expansion cards
ECC memory is not supported, ruling this board out for workloads that require error-correcting RAM
No S/PDIF Out port restricts digital audio output options for users with compatible receivers or DACs
Only one USB 3.2 Gen 2 port on the rear I/O alongside four USB 2.0 ports, which may feel limited for setups with multiple high-speed peripherals
No Thunderbolt 3 or Thunderbolt 4 ports, excluding high-bandwidth use cases that depend on those interfaces

Who is this for?

This board is a solid fit for AMD AM5 desktop builds where mainstream gaming or general-purpose computing is the primary goal, particularly for users who want integrated Wi-Fi 6E and Bluetooth 5.3 without adding extra cards. The four DDR5 slots supporting up to 192 GB and overclocked speeds up to 7600 MHz make it well-suited to content creation or multitasking workloads that benefit from ample, fast memory. The three M.2 sockets, four SATA 3 connectors, and full RAID 0, 1, 5, and 10 support also make it a reasonable choice for users who want flexible multi-drive storage configurations within an ATX chassis.

Who is this NOT for?

Users pursuing a high-end workstation or server environment will find this board lacking, as it does not support ECC memory, which is a requirement for error-sensitive professional workloads. The absence of a PCIe 5.0 x16 slot makes it a poor match for anyone planning to install next-generation expansion cards that depend on that bandwidth. Similarly, creative professionals or power users who rely on Thunderbolt connectivity for high-speed external storage, docking stations, or specialized peripherals will need to look elsewhere, as neither Thunderbolt 3 nor Thunderbolt 4 ports are available on this board.

General info:

CPU socket	AM5
chipset	B840
form factor	ATX
supports Wi-Fi	✓
Wi-Fi version	Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac), Wi-Fi 6 (802.11ax), Wi-Fi 6E (802.11ax)
Has Bluetooth	✓
Bluetooth version	5.3
HDMI version	HDMI 2.1
Easy to overclock	✓
has RGB lighting	✓
Easy to reset BIOS	✓
Has dual BIOS	✓
has aptX	✕
CPU sockets	1
Has integrated graphics	✕
warranty period	3 years
height	244 mm
width	305 mm
Has integrated CPU	✕

The Asus Prime B840-Plus WiFi is an ATX form factor motherboard built around the AM5 socket and the B840 chipset, measuring 305 mm × 244 mm and fitting a single CPU. It supports the full range of modern wireless standards through Wi-Fi 6E (802.11ax), along with Bluetooth 5.3, though aptX audio codec support is not included. The board ships with HDMI 2.1 output, RGB lighting, and a clear CMOS button for straightforward BIOS recovery, while the dual BIOS feature adds an extra layer of firmware resilience. Overclocking is noted as accessible, and the board covers a 3-year warranty period. There is no integrated CPU or integrated graphics on this board.

Memory:

maximum memory amount	192GB
overclocked RAM speed	7600 MHz
memory slots	4
DDR memory version	5
memory channels	2
Supports ECC memory	✕

This board uses DDR5 memory across four slots arranged in a dual-channel configuration, with a maximum supported capacity of 192 GB. Overclocked profiles can reach up to 7600 MHz, offering flexibility for performance-oriented builds. ECC memory is not supported.

Ports:

USB 3.2 Gen 2 ports (USB-A)	1
USB 3.2 Gen 1 ports (USB-A)	2
USB 3.2 Gen 2 ports (USB-C)	1
USB 3.2 Gen 1 ports (USB-C)	0
USB 2.0 ports	4
USB 3.2 Gen 2x2 ports	0
USB 4 40Gbps ports	0
USB 4 20Gbps ports	0
Thunderbolt 4 ports	0
Thunderbolt 3 ports	0
has an HDMI output	✓
DisplayPort outputs	1
RJ45 ports	1
Has USB Type-C	✓
eSATA ports	0
DVI outputs	0
has a VGA connector	✕
PS/2 ports	0

The rear I/O provides a varied USB selection, including one USB 3.2 Gen 2 Type-A port, two USB 3.2 Gen 1 Type-A ports, one USB 3.2 Gen 2 Type-C port, and four USB 2.0 ports; there are no USB 3.2 Gen 2x2, USB 4, Thunderbolt 3, or Thunderbolt 4 ports. Display output is covered by one HDMI port and one DisplayPort output, with no DVI or VGA connectors present. Networking is handled by a single RJ45 port, and there are no eSATA or PS/2 ports on this board.

Connectors:

USB 3.2 Gen 1 ports (through expansion)	2
USB 2.0 ports (through expansion)	4
SATA 3 connectors	4
fan headers	6
USB 3.0 ports (through expansion)	2
M.2 sockets	3
Has TPM connector	✓
U.2 sockets	0
Has mSATA connector	✕
SATA 2 connectors	0

Internal connectivity includes three M.2 sockets and four SATA 3 connectors for storage, while SATA 2 and U.2 sockets are absent, as is an mSATA connector. For USB expansion headers, the board offers two USB 3.2 Gen 1 connectors, two USB 3.0 connectors, and four USB 2.0 connectors. Cooling is supported through six fan headers, and a TPM connector is also present on the board.

Expansion slots:

PCIe 4.0 x16 slots	1
PCIe 5.0 x16 slots	0
PCIe 3.0 x16 slots	3
PCIe x1 slots	0
PCI slots	0
PCIe 2.0 x16 slots	0
PCIe x4 slots	0
PCIe x8 slots	0

The board offers one PCIe 4.0 x16 slot alongside three PCIe 3.0 x16 slots for expansion. There are no PCIe 5.0 x16, PCIe 2.0 x16, PCIe x8, PCIe x4, PCIe x1, or legacy PCI slots present.

Audio:

audio channels	7.1
Has S/PDIF Out port	✕
audio connectors	3

The board supports 7.1-channel audio through three analog audio connectors on the rear I/O. An S/PDIF Out port is not included.

Storage:

Supports RAID 1	✓
Supports RAID 10 (1+0)	✓
Supports RAID 5	✓
Supports RAID 0	✓
Supports RAID 0+1	✕

The board supports RAID 0, 1, 5, and 10 configurations, covering common setups for both performance and redundancy. RAID 0+1 is not supported.

Final Verdict

The Asus Prime B840-Plus WiFi is a capable ATX motherboard for the AM5 platform that covers the essentials of a modern mid-range desktop build without overreaching. Its Wi-Fi 6E connectivity, DDR5 support across four slots, and three M.2 sockets give it a practical edge for users building a versatile gaming or productivity system, while the dual BIOS and clear CMOS button add a layer of reliability that is genuinely useful day-to-day. It does carry meaningful limitations — no PCIe 5.0, no ECC support, and no Thunderbolt — that place a clear ceiling on its appeal for demanding professional or enthusiast workloads. For builders who do not need those capabilities, however, it represents a well-rounded B840-based option with solid connectivity and storage flexibility.