MSI PRO B840M-B
MSI PRO B840M-B Specifications Review
MSI PRO B840M-B by MSI is a Micro-ATX form factor motherboard based on the mid-range AMD B840 chipset and AM5 socket, providing a balanced set of features and connectivity. It is designed to support DDR5 memory, with 2 slots, a maximum capacity of 128 GB, and an overclocking speed of up to 8000 MHz.
VRM Quality
The MSI PRO B840M-B has a basic VRM configuration, delivering 60 A across 7 phases. Best for low-power CPUs (≤65 W TDP). Using high-wattage chips or overclocking could cause severe thermal issues and instability. Recommended for budget builds, office workstations, and media PCs.
See the VRM Appropriate CPU Specification Table at the bottom of this page for recommended CPU options.
Expansion and Storage Overview
The MSI PRO B840M-B offers a simplified expansion and storage configuration with PCIe 4.0 support, meaning it uses PCI Express 4.0, fast enough for modern GPUs and high-speed NVMe SSDs. It also includes 1 x16 slot , and 1 x1 slot. These PCIe slots are used to connect expansion cards — with the x16 slots typically reserved for graphics cards, while x8, x4, and x1 slots are used for devices like capture cards, sound cards, or network adapters.
For storage, this motherboard provides 2 M.2 slots (PCIe 4.0 x4, PCIe 4.0 x2) and 4 SATA ports. M.2 slots are high-speed connectors for modern NVMe SSDs, which are much faster than older storage, while SATA ports are used for traditional hard drives and 2.5-inch SSDs. Together, they allow you to mix fast primary storage with larger, more affordable drives for bulk data.
Connectivity Overview
This motherboard has essential connectivity features with wired Realtek ® 8125D 2.5G LAN Ethernet . USB connectivity covers basic needs. Please refer to the specification table for details.
For video output, this motherboard includes HDMI version 2.1 . These video outputs are intended for integrated graphics and will only function if your CPU includes integrated GPU capabilities.
Audio Quality
The motherboard includes a standard audio chipset (Realtek ALC897) that covers basic needs for casual listening. While adequate for everyday use with mainstream headphones or desktop speakers, discerning users may want to add a USB DAC or sound card for improved fidelity, especially for music production or high-end headphones.
Overall Quality and Value
MSI PRO B840M-B is basic and functional, carrying an overall quality score of 43.60. It is designed for budget-conscious builds or office setups where advanced features are not required, handling standard tasks effectively but lacking the polish or expandability of higher-tier models.
This motherboard has a solid 63.7% value efficiency, providing decent performance relative to its price. It represents a balanced option for users seeking fair capabilities without paying a premium.
General Information
| Manufacturer | MSI |
|---|---|
| Motherboard Name | MSI PRO B840M-B |
| Current Price Amazon | $130 |
| Amazon Price Updated | 1 day, 21 hours ago. |
| Motherboard Available | True |
| Chipset / Socket | AMD B840 / AM5 |
| Form Factor | Micro-ATX |
VRM Configuration
| CPU Power Phases (Amps) | 7 (60 A) |
|---|---|
| Power Design | 7 + 2 +1 |
Memory Information
| Type / Slots | DDR5 / 2 slots |
|---|---|
| Max Capacity / Max OC | 128 GB / 8000 MHz |
PCIe Slot Configuration
| Supported Version | PCIe 4.0 | ||||
|---|---|---|---|---|---|
| Slot Size | Physical Slots | Gen4 | Gen3 |
|---|---|---|---|
| x16 | 1 | 1 | 0 |
| x1 | 1 | 0 | 1 |
Storage Configuration
| M.2 Slot Count | 2 slots |
|---|---|
| M.2 Supported Lengths | 2280, 2260 |
| M.2 PCIe Modes | PCIe 4.0 x4, PCIe 4.0 x2 |
| SATA Ports | 4 |
Onboard Audio Features
| Audio Chipset | Realtek ALC897 |
|---|---|
| Spatial/Surround Audio | ✔️ Rear Output Supports Spatial Audio |
Motherboard Display Outputs
| HDMI Output | HDMI - Version 2.1 (Max: 4K 60Hz) |
|---|
USB and Thunderbolt Connectivity
Rear USB Ports
| USB 2.0 Type-A (480 Mbps) | 2 |
|---|---|
| USB 3.2 Gen 1 Type-A (5 Gbps) | 4 |
Front USB Ports
| USB 2.0 Type-A (480 Mbps) | 4 |
|---|---|
| USB 3.2 Gen 1 Type-A (5 Gbps) | 2 |
| USB 3.2 Gen 1 Type-C (5 Gbps) | 1 |
Internal USB Headers
| USB 2.0 Header (480 Mbps) | 4 |
|---|---|
| USB 3.2 Gen 1 Header (5 Gbps) | 3 |
Networking Information
| Ethernet | Chipset: Realtek ® 8125D 2.5G LAN LAN Ports: 1 |
|---|---|
| Wi-Fi |
Module: Not Included |
| Bluetooth | Supported: No |
Button Features
| Buttons |
BIOS Flashback Clear CMOS |
|---|
Quality & Features
Additional Information
| CPU Support | Supports AMD Ryzen™ 9000/ 8000/ 7000 Series Desktop Processors, Socket AM5, |
|---|---|
| OS Support | Support for Windows ® 11 64-bit, |
| RAM | Supports AMD EXPO TM. For Ryzen™ 9000 Series Processors, max overclocking frequency is up to 8000+ MT/s for 1DPC 1R and up to 7200+ MT/s for 1DPC 2R. Supports AMD POR Speed and JEDEC Speed. Supports Un-buffered memory. Supports CUDIMM in Clock Driver bypass mode only, but support and boot frequency may vary by CPU series and require future BIOS updates. The DIMM slots have single-sided latches. Memory compatibility and supported speeds can vary depending on the CPU and memory configuration. |
| Display | Includes 1x VGA port, supporting a maximum resolution of 2048x1536 50Hz, 2048x1280 60Hz, or 1920x1200 60Hz. Video outputs are available only on processors featuring integrated graphics. Graphics specifications may vary depending on the CPU installed. |
| Expansion | PCI_E1 Gen PCIe 4.0 supports up to x16 (From CPU). PCI_E2 Gen PCIe 3.0 supports up to x1 (From Chipset). The PCI_E1 slot supports PCIe 4.0 x16 for Ryzen™ 9000/7000 Series processors, PCIe 4.0 x8 for Ryzen™ 8700/8600/8400 Series processors, and PCIe 4.0 x4 for Ryzen™ 8500/8300 Series processors. |
| Storage |
M.2 Slot Details:
|
| Audio | 7.1-Channel High Definition Audio |
| Accessories | , |
| Dimensions | mATX, 226mmx243.84mm, |
Note: The specifications and descriptions above are extracted by AI to present the official manufacturer data in a clearer and more natural way for easier understanding. However, this AI-processed information may contain inaccuracies. Please verify all details by consulting the official manufacturer's information provided below.
MSI PRO B840M-B Compared to Motherboards with Similar Performance and Features
Motherboard Quality & Features per Price Table
| Motherboard (Desc) | Price (Desc) | Overall_Q (Desc) | VRM_Q (Desc) | Chipset (Desc) | Exp_Str (Desc) | Connect (Desc) | Audio (Desc) | Q&F/Price (Desc) |
|---|---|---|---|---|---|---|---|---|
|
$160❗
|
0.0%
|
46.6%
|
18.0%
|
78.0%
|
63.0%
|
34.0%
|
40.0%
|
55.3%
|
|
|
$171
|
↑
0.0%
|
45.6%
|
14.0%
|
69.0%
|
55.0%
|
45.0%
|
45.0%
|
50.7%
|
|
|
$172
|
↑
0.1%
|
45.6%
|
24.0%
|
69.0%
|
55.0%
|
35.0%
|
45.0%
|
50.3%
|
|
|
$170
|
0.0%
|
44.4%
|
24.0%
|
68.0%
|
34.0%
|
56.0%
|
40.0%
|
49.6%
|
|
|
$130
|
0.0%
|
43.6%
|
22.0%
|
71.0%
|
51.0%
|
34.0%
|
40.0%
|
63.7%
|
|
|
$120
|
0.0%
|
42.6%
|
14.0%
|
74.0%
|
51.0%
|
34.0%
|
40.0%
|
67.5%
|
|
|
$166
|
↑
4.4%
|
42.2%
|
14.0%
|
65.0%
|
55.0%
|
32.0%
|
45.0%
|
48.2%
|
|
|
$139❗
|
↓
-2.2%
|
40.4%
|
20.0%
|
71.0%
|
37.0%
|
34.0%
|
40.0%
|
55.2%
|
|
|
$240❗
|
0.0%
|
40.2%
|
24.0%
|
40.0%
|
45.0%
|
44.0%
|
48.0%
|
31.8%
|
Motherboard Comparison and Detail Specifications Table
| Specification | Perf Chart | ||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Price |
$160❗
|
0.0%
|
$171
|
↑
0.0%
|
$172
|
↑
0.1%
|
$170
|
0.0%
|
$130
|
0.0%
|
$120
|
0.0%
|
$166
|
↑
4.4%
|
$139❗
|
↓
-2.2%
|
$240❗
|
0.0%
|
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| Manufacturer | ASRock | GIGABYTE | Gigabyte | ASRock | MSI | GIGABYTE | Gigabyte | MSI | parts-quick | ||||||||||||||||||||||||||||||||||||||||||||
| Chip/Socket | B850M / AM5 | AMD B840 / AM5 | AMD B840 / AM5 | B650I / AM5 | AMD B840 / AM5 | B650M / AM5 | AMD B840 / AM5 | B650M / AM5 | A620M / AM5 | ||||||||||||||||||||||||||||||||||||||||||||
| Form | Micro-ATX | Micro-ATX | Micro-ATX | Mini-ITX | Micro-ATX | Micro-ATX | Micro-ATX | Micro-ATX | Micro-ATX | ||||||||||||||||||||||||||||||||||||||||||||
| CPU Phases | 6 (60 A) | 5 (60 A) | 8 (60 A) | 8 (60 A) | 7 (60 A) | 5 (60 A) | 5 (60 A) | 7 (55 A) | 8 (60 A) | ||||||||||||||||||||||||||||||||||||||||||||
| PWR Design | 6+1+1 | 5 + 2 + 1 | 8+2+2 | 8+2+1 | 7 + 2 +1 | 5+2+2 | 5+2+2 | 7+2+1 | 8+2+1 | ||||||||||||||||||||||||||||||||||||||||||||
| Mem Slots | 2 / DDR5 | 2 / DDR5 | 4 / DDR5 | 2 / DDR5 | 2 / DDR5 | 4 / DDR5 | 2 / DDR5 | 2 / DDR5 | 4 / DDR5 | ||||||||||||||||||||||||||||||||||||||||||||
| Max Mem | 128 GB / 8200 MHz | 128 GB / 7600 MHz | 256 GB / 8200 MHz | 128 GB / 7200 MHz | 128 GB / 8000 MHz | 256 GB / 8000 MHz | 128 GB / 7600 MHz | 128 GB / 6800 MHz | 256 GB / 8000 MHz | ||||||||||||||||||||||||||||||||||||||||||||
| PCIe | PCIe 4.0 | PCIe 4.0 | PCIe 4.0 | PCIe 4.0 | PCIe 4.0 | PCIe 4.0 | PCIe 4.0 | PCIe 4.0 | PCIe 4.0 | ||||||||||||||||||||||||||||||||||||||||||||
| PCIe Slots | 2x16 Gen4 | 1x1 Gen4 | 1x16 Gen4 | 1x16 Gen3 | 1x16 Gen4 | 1x16 Gen3 | 1x16 Gen4 | 1x16 Gen4 | 1x1 Gen3 | 1x16 Gen4 | 1x1 Gen3 | 1x16 Gen4 | 1x16 Gen3 | 1x16 Gen4 | 1x1 Gen3 | 1x16 Gen4 | 1x1 Gen3 | ||||||||||||||||||||||||||||||||||||||||||||
| M.2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | ||||||||||||||||||||||||||||||||||||||||||||
| SATA | 4 | 4 | 4 | 2 | 4 | 4 | 4 | 4 | 4 | ||||||||||||||||||||||||||||||||||||||||||||
| Audio | Realtek ALC897 Audio Codec | Realtek® ALC892/ALC897 | Realtek® ALC892/ALC897 | Realtek ALC897 | Realtek ALC897 | Realtek® Audio CODEC | Realtek® ALC892/ALC897 | Realtek® ALC897 Codec | Realtek® ALC892/ALC897 | ||||||||||||||||||||||||||||||||||||||||||||
| S/PDIF | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ✔️ | ||||||||||||||||||||||||||||||||||||||||||||
| HDMI | ✔️ (2.1) | ✔️ (2.1) | ✔️ (2.1) | ✔️ (2.1) | ✔️ (2.1) | ✔️ (2.1) | ✔️ (2.1) | ✔️ (2.1) | ✔️ (2.1) | ||||||||||||||||||||||||||||||||||||||||||||
| DP | ✔️ (1.4) | ✔️ (1.4) | ✔️ (1.4) | ❌ | ❌ | ✔️ (1.4) | ❌ | ✔️ (1.4) | ✔️ (1.4) | ||||||||||||||||||||||||||||||||||||||||||||
| LAN | 2.5 Gigabit LAN 10/100/1… (1 ports) | Realtek® 2.5GbE LAN chip… (1 ports) | Realtek® 2.5GbE LAN chip… (1 ports) | 2.5 Gigabit LAN 10/100/1… (1 ports) | Realtek ® 8125D 2.5G LAN (1 ports) | Realtek® 2.5GbE LAN chip… (1 ports) | Realtek® 2.5GbE LAN chip… (1 ports) | Realtek® 8125BG 2.5G (1 ports) | Realtek® GbE LAN chip (1… (1 ports) | ||||||||||||||||||||||||||||||||||||||||||||
| Wi-Fi | ❌ | Wi-Fi Wi-Fi 6 | ❌ | Wi-Fi Wi-Fi 6E | ❌ | ❌ | ❌ | ❌ | Wi-Fi Wi-Fi 6E | ||||||||||||||||||||||||||||||||||||||||||||
| BT | ❌ | v5.3 | ❌ | v5.2 | ❌ | ❌ | ❌ | ❌ | v5.2 | Rear USB |
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| USB Headers |
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| Front USB |
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❌ |
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VRM Appropriate CPU Specification Table
| CPU | Price | App_Performance | Game_Performance | TDP/Max | C/SC/T | L2/L3 Cache | Base/Boost | Code Name | GPU |
|---|---|---|---|---|---|---|---|---|---|
|
$266
|
0.0%
|
45.2%
|
63.7%
|
65 W / 61 W | 8 / 0 / 16 | 1024.0 kB / 16.0 MB | 4.20 GHz / 5.10 GHz | Phoenix | Radeon 780M | |
|
$180
|
↓
-14.3%
|
45.1%
|
63.5%
|
65 W / 61 W | 8 / 0 / 16 | 1024.0 kB / 16.0 MB | 4.10 GHz / 5.00 GHz | Phoenix | None | |
|
$188
|
0.0%
|
35.8%
|
63.7%
|
65 W / 61 W | 6 / 0 / 12 | 1024.0 kB / 16.0 MB | 4.30 GHz / 5.00 GHz | Phoenix | Radeon 760M | |
|
$149
|
0.0%
|
34.7%
|
62.3%
|
65 W / 61 W | 6 / 0 / 12 | 1024.0 kB / 16.0 MB | 4.20 GHz / 4.70 GHz | Phoenix | None | |
|
$149
|
0.0%
|
31.3%
|
57.3%
|
65 W / 61 W | 6 / 0 / 12 | 1024.0 kB / 16.0 MB | 3.50 GHz / 5.00 GHz | Phoenix2 | Radeon 740M |
Official Manufacturer Data
Memory:
• 1DPC 1R Max speed up to 8000+ MT/s,
• 1DPC 2R Max speed up to 7200+ MT/s, , Supports AMD POR Speed and JEDEC Speed,
Supports Memory Overclocking and AMD EXPO TM,
Supports Dual-Channel mode,
Supports Non-ECC, Un-buffered memory,
Supports CUDIMM, Clock Driver bypass mode only*, , * CUDIMM support and POR boot frequency may vary by CPU series, with manual overclocking available after boot. Certain CPUs may fail to boot, but future BIOS updates will improve compatibility., • The DIMM slots on this motherboard have single-sided latches.,
• Memory compatibility and supported speeds can vary depending on the CPU and memory configuration. For detailed information, please refer to the Memory Compatibility List available on the product’s Support page or visit https://www.msi.com/support/.,
Graphics:
Storage:
M2_2 slot,
• Supports up to PCIe 4.0 x4,
• Supports up to PCIe 4.0 x2 (For Ryzen™ 8500/ 8300 Series processors),, Supports RAID 0, RAID 1 and RAID 10 for SATA storage devices,
Supports RAID 0 and RAID 1 for M.2 NVMe storage devices,
Expansion Slots:
PCI_E1 slot,
• Supports PCIe 4.0 x16 (For Ryzen™ 9000/ 7000 Series processors),
• Supports PCIe 4.0 x8 (For Ryzen™ 8700/ 8600/ 8400 Series processors),
• Supports PCIe 4.0 x4 (For Ryzen™ 8500/ 8300 Series processors),
USB:
Internal I/O:
Back Panel I/O:
Audio:
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