Asus Prime B850-Plus

Name: Asus Prime B850-Plus
Brand: Asus
SKU: 5987

Manufacturer: Asus

The Asus Prime B850-Plus is an ATX form factor motherboard designed around AMD's AM5 socket and the B850 chipset. It carries a 3-year warranty and includes practical convenience features such as dual BIOS, easy CMOS reset, and RGB lighting, making it a straightforward choice for builders who value reliability and flexibility in their setup.

On the memory side, the board accommodates up to 256GB of DDR5 RAM across four slots in a dual-channel configuration, with overclocked speeds reaching up to 8000 MHz. Connectivity is well-covered with a total of eight rear USB ports spanning USB 2.0 through USB 3.2 Gen 2, alongside HDMI 2.1 and one DisplayPort output. Internally, three M.2 sockets, four SATA 3 connectors, and full RAID support (0, 1, 5, and 10) round out the storage options, while one PCIe 5.0 x16 and one PCIe 4.0 x16 slot handle expansion needs.

Pros

Dual BIOS support adds a layer of protection against failed BIOS updates, making recovery straightforward
Three M.2 sockets alongside four SATA 3 connectors offer flexible storage configuration options
Support for RAID 0, 1, 5, and 10 provides meaningful redundancy and performance options for multi-drive setups
DDR5 memory with overclocked speeds up to 8000 MHz across four slots allows for high-capacity and fast memory configurations
Both a PCIe 5.0 x16 and a PCIe 4.0 x16 slot are available, covering current-generation expansion needs
The rear USB selection spans multiple generations including USB 3.2 Gen 2 Type-A and Type-C ports, giving a broad range of device compatibility

Cons

No built-in Wi-Fi or Bluetooth means a separate adapter is required for wireless connectivity
The absence of USB4 and Thunderbolt ports limits compatibility with high-bandwidth peripherals and docks
No S/PDIF output restricts options for users who need digital audio passthrough to external receivers
Only three analog audio connectors are available, which may be limiting for complex multi-speaker analog setups
ECC memory is not supported, ruling out use cases that require error-correcting RAM

Who is this for?

This board is a solid fit for desktop builders targeting an AM5 platform who want room to grow — particularly those planning a capable gaming or workstation setup. The combination of a PCIe 5.0 x16 slot and DDR5 memory support up to 8000 MHz makes it well-suited for users installing current-generation discrete graphics and fast memory kits. The presence of dual BIOS, easy CMOS reset, and overclocking support also makes it a practical choice for enthusiasts who like to tune and experiment with their system without worrying about bricking the board. Users who need flexible multi-drive storage will also appreciate the three M.2 sockets, four SATA 3 connectors, and broad RAID configuration support.

Who is this NOT for?

This board is not a good match for users who need wireless connectivity out of the box, as there is no built-in Wi-Fi or Bluetooth — a consideration for compact or cable-free desk setups. Those working with demanding peripherals or high-bandwidth docks will find the lack of USB4 or Thunderbolt ports a meaningful limitation. It is also unsuitable for workstation or server environments that require ECC memory support, or for home theater builds where S/PDIF digital audio output to an external receiver is expected.

General info:

CPU socket	AM5
chipset	B850
form factor	ATX
supports Wi-Fi	✕
Has Bluetooth	✕
HDMI version	HDMI 2.1
Easy to overclock	✓
has RGB lighting	✓
Easy to reset BIOS	✓
Has dual BIOS	✓
CPU sockets	1
Has integrated graphics	✕
warranty period	3 years
height	244 mm
width	305 mm
Has integrated CPU	✕

The Asus Prime B850-Plus is built around the AM5 socket with B850 chipset compatibility and follows the standard ATX form factor, measuring 305 mm wide and 244 mm tall. It supports a single CPU and does not include an integrated CPU or integrated graphics. The board features dual BIOS with an easy CMOS reset option and supports overclocking, making BIOS management and tuning more accessible. RGB lighting is present, and a video output is provided via HDMI 2.1. Neither Wi-Fi nor Bluetooth is built in, so wireless connectivity would require a separate adapter. The board comes with a 3-year warranty.

Memory:

maximum memory amount	256GB
overclocked RAM speed	8000 MHz
memory slots	4
DDR memory version	5
memory channels	2
Supports ECC memory	✕

The board supports DDR5 memory across four slots in a dual-channel configuration, with a maximum capacity of 256GB. Overclocked RAM speeds can reach up to 8000 MHz, providing headroom for performance-oriented memory kits. ECC memory is not supported.

Ports:

USB 3.2 Gen 2 ports (USB-A)	3
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	2
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 panel offers a solid range of USB connectivity, including three USB 3.2 Gen 2 Type-A ports, two USB 3.2 Gen 1 Type-A ports, one USB 3.2 Gen 2 Type-C port, and two USB 2.0 ports. Higher-speed standards such as USB 3.2 Gen 2x2, USB4, Thunderbolt 3, and Thunderbolt 4 are not present. For display output, there is one HDMI port and one DisplayPort output, while VGA and DVI are absent. A single RJ45 port handles wired network connectivity. There are no eSATA or PS/2 ports.

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

Storage connectivity is handled by three M.2 sockets and four SATA 3 connectors, while SATA 2, mSATA, and U.2 are not available. For internal USB expansion, the board provides two USB 3.2 Gen 1 headers, two additional USB 3.0 headers, and four USB 2.0 expansion ports. Cooling is supported through six fan headers, and a TPM connector is also present for security module use.

Expansion slots:

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

The board provides two full-length expansion slots: one PCIe 5.0 x16 and one PCIe 4.0 x16, covering the two most current generations for discrete card installation. There are no PCIe 3.0, PCIe 2.0, PCIe x8, PCIe x4, PCIe x1, or legacy PCI slots present, keeping the layout focused rather than broad.

Audio:

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

The onboard audio supports 7.1-channel surround sound and is accessible through three analog audio connectors. 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 four RAID configurations: RAID 0, RAID 1, RAID 5, and RAID 10, covering a range of performance and redundancy setups. RAID 0+1 is not supported.

Final Verdict

The Asus Prime B850-Plus is a well-rounded AM5 motherboard that covers the essentials for a capable DDR5-based desktop build. Its PCIe 5.0 x16 slot combined with overclockable DDR5 memory support up to 8000 MHz positions it firmly for users building a current-generation system with room to push performance. Practical features like dual BIOS, a TPM connector, three M.2 sockets, and broad RAID support add genuine everyday value beyond raw specs. The absence of integrated wireless and high-speed USB standards such as USB4 or Thunderbolt means it is best suited for wired, purpose-built desktops rather than versatile all-in-one setups. For builders who know what they need and prioritize platform reliability and storage flexibility over wireless convenience, the Prime B850-Plus makes a clear and considered choice.