MSI Pro B840M-B

Manufacturer: MSI

The MSI Pro B840M-B is a Micro-ATX motherboard designed for users seeking a reliable solution for building a desktop. With an AM5 CPU socket, this motherboard supports modern processors and features easy overclocking for enhanced performance.

It offers support for up to 128GB of DDR5 memory, with a maximum RAM speed of 5600 MHz, and even allows overclocking to 8000 MHz. Additionally, it includes HDMI 2.1 output, one RJ45 port, and supports RAID 0, 1, and 10 configurations for flexible storage options.

Pros

Supports RAID 1, RAID 10 (1+0), and RAID 0 for flexible and reliable storage configurations.
Includes RGB lighting for customization and aesthetic appeal.
Equipped with 2 M.2 sockets for fast storage expansion options.
Has 3 fan headers, allowing for efficient cooling and airflow management.
Offers easy overclocking, providing users with enhanced performance tuning options.

Cons

Lacks support for RAID 5 and RAID 0+1, limiting certain RAID setup possibilities.
Does not include built-in Bluetooth or Wi-Fi support, restricting wireless connectivity options.
Only has 1 PCIe 4.0 x16 slot, limiting expansion options for high-speed devices.
Does not support integrated graphics, requiring a discrete GPU for video output.
Lacks Thunderbolt 3/4, USB 3.2 Gen 2x2, and USB 4 ports, limiting high-speed data transfer options.

Who is this for?

The MSI Pro B840M-B motherboard is well-suited for users seeking a reliable, customizable motherboard for basic to mid-range builds, especially for those who need RAID 1, RAID 10 (1+0), or RAID 0 support for data redundancy or performance. It also caters to users who want to enhance their system's appearance with RGB lighting and requires an efficient cooling solution with 3 fan headers. Additionally, the easy overclocking feature makes it appealing for users looking to boost their system’s performance.

Who is this NOT for?

This motherboard is not ideal for users who require built-in Bluetooth or Wi-Fi connectivity, as these features are not supported. It is also less suitable for high-end gaming or workstation builds, given its limited expansion with only 1 PCIe 4.0 x16 slot and no support for integrated graphics or Thunderbolt ports. Heavy multitaskers or professionals needing RAID 5 or RAID 0+1 configurations will find this motherboard inadequate for those specific storage requirements.

General info:

CPU socket	AM5
chipset	B840
form factor	Micro-ATX
release date	May 2025
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	226 mm
width	243.8 mm
Has integrated CPU	✕

The MSI Pro B840M-B features a Micro-ATX form factor and a single AM5 CPU socket, supporting the B840 chipset. It offers RGB lighting for added customization and supports easy overclocking for improved performance. The motherboard also includes HDMI 2.1 output and has a 3-year warranty, though it lacks built-in Bluetooth, Wi-Fi support, and integrated graphics. Additionally, it does not include dual BIOS or an integrated CPU, but it offers an easy method to reset the BIOS.

Memory:

maximum memory amount	128GB
RAM speed (max)	5600 MHz
overclocked RAM speed	8000 MHz
memory slots	2
DDR memory version	5
memory channels	2
Supports ECC memory	✕

The MSI Pro B840M-B supports up to 128GB of DDR5 memory, with a maximum RAM speed of 5600 MHz, and even allows overclocking to 8000 MHz. It has 2 memory slots and operates on 2 memory channels, though it does not support ECC memory for error correction.

Ports:

USB 3.2 Gen 2 ports (USB-A)	0
USB 3.2 Gen 1 ports (USB-A)	4
USB 3.2 Gen 2 ports (USB-C)	0
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	0
RJ45 ports	1
Has USB Type-C	✓
eSATA ports	0
DVI outputs	0
has a VGA connector	✓
PS/2 ports	0

The MSI Pro B840M-B offers a range of ports including 1 HDMI output, 1 USB Type-C port, and a VGA connector. It includes 4 USB 3.2 Gen 1 USB-A ports, 2 USB 2.0 ports, and 1 RJ45 port for networking. However, it lacks support for Thunderbolt, DisplayPort, or eSATA connections, and does not include USB 3.2 Gen 2 or USB 4 ports.

Connectors:

USB 3.2 Gen 1 ports (through expansion)	2
USB 3.2 Gen 2 ports (through expansion)	0
USB 3.2 Gen 2x2 ports (through expansion)	0
USB-C 3.2 Gen 2 ports (through expansion)	0
USB 2.0 ports (through expansion)	4
SATA 3 connectors	4
fan headers	3
USB 3.0 ports (through expansion)	2
M.2 sockets	2
Has TPM connector	✓
U.2 sockets	0
Has mSATA connector	✕
SATA 2 connectors	0

The MSI Pro B840M-B provides multiple expansion options, including 2 USB 3.2 Gen 1 connectors and 4 USB 2.0 ports through expansion. It offers 2 M.2 sockets for high-speed storage and has 4 SATA 3 connectors for additional drives. The motherboard also features 3 fan headers for cooling, and includes a TPM connector for security, though it lacks support for mSATA or U.2 sockets.

Expansion slots:

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

The MSI Pro B840M-B motherboard is equipped with 1 PCIe 4.0 x16 slot and 1 PCIe x1 slot, providing options for expansion cards. However, it lacks PCIe 5.0, PCIe 3.0, PCIe 2.0, PCIe x4, and PCIe x8 slots, offering fewer high-bandwidth expansion options.

Audio:

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

The MSI Pro B840M-B supports 7.1 audio channels for an immersive sound experience. It includes 3 audio connectors for connecting various audio devices but does not have an S/PDIF Out port for digital audio output.

Storage:

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

The MSI Pro B840M-B supports several RAID configurations including RAID 1, RAID 10 (1+0), and RAID 0 for improved storage performance and redundancy. However, it does not support RAID 5 or RAID 0+1, limiting certain storage setup options.

Final Verdict

The MSI Pro B840M-B motherboard is a solid choice for users looking for a reliable and customizable board for general-purpose builds. With support for multiple RAID configurations such as RAID 1, RAID 10, and RAID 0, along with easy overclocking and RGB lighting, it strikes a balance between performance and aesthetics. However, it may not be suitable for those who need advanced features like built-in Bluetooth, Wi-Fi, or Thunderbolt support. Overall, it is best suited for users who prioritize stability and basic expandability in their setups, making it a good fit for everyday computing needs and light gaming.