The PRO B840M-B motherboard supports AMD Ryzen 9000 / 8000 / 7000 Series processors.
Form Factor: mATX
Socket Type: AM5
Chipset: AMD B840
PRO B840M-B is engineered with many exclusive features of MSI, PCIe 4.0 M.2, EZ PCIe Clip II, 2.5G LAN, and Front Type-C, ready for the AMD Ryzen™ 9000 series processors.
Free Shipping
On order over $25
Return for Refund
Within 30 days
3-YEARS Limited Warranty
Base-on purchase date
Shipping
Free shipping is one-way unless otherwise authorized to return under policy conditions. Minimum $25 purchase to qualify for free standard ground shipping. And all orders are not delivered on Sundays or holidays.
Orders are processed Monday-Friday (excluding holidays). Orders placed after the cutoff time (2:00 P.M PST) are processed and shipped the next business day.
Free Shipping is only for lower 48-states customers, excluding Alaska, Hawaii, US Permanently-inhabited Territories and Protectorates. International shipping is not available at this time.
For all orders $500 or more via FedEx, a delivery signature is required for receipt of the product and we can only deliver to the address that you have provided on your order. If signature is required, please make sure someone will be available to sign for your package. FedEx will make a maximum of 3 delivery attempts to the address on your order. After 3 delivery attempts, you can contact regarding the address of the FedEx Ground Station. If the item is not picked up within a certain time, they will ship the item back to us.
For more completed information, please see our Shipping Policy
Return Policy
Items returned must be accompanied by the original packaging and the Return Packing Slip, and MUST be originally sold by MSI-US Official Online Store
Upon receiving the item and preferring a return, conditions will apply: Item(s) must be shipped back the original condition. While we understand that some items are being returned because they may not work the way a customer expects it to, we do expect all items to be put back in its place. The item must be unassembled and include all accessories and hardware parts. Any alterations to the original item will automatically negate the warranty. All returns must be accompanied by all original packaging that came with the product. The original packaging is designed to keep the product safe during shipping and alterations to this or changes to it can result in damages. The Buyer is responsible for all costs associated with the return which will be deducted from the Buyer’s final return refund. This includes orders from a free shipping listing.
Returned item(s) are subject to inspection upon arrival. Any missing or damaged components will result in an assessment and reduction to the final refund amount. We do not accept returns after 30 days of the purchase date under any circumstances.
Any alterations to the original item will automatically negate the warranty.
For more completed information, please see our Return Policy
Motherboard Service Policy
In accordance with original manufacturer's products serial number/barcode, it is warranted for 36 months repair service from its manufacture date.
CPU Bundle Option - 1 Year Limited Warranty
MSI will either repair the original parts with new or reconditioned parts, or replace the unit with one which is defined by MSI technician as a fully functional equivalent model. All customer pays one-way shipping and MSI will cover the cost of return shipping back to the customer.
For more completed information, please see our Warranty Page
| OPERATING SYSTEM | Support for Windows® 11 64-bit |
|---|---|
| Manufacturer Number | PRO B840M-B |
| Product Condition | New |
| CPU | Supports AMD Ryzen™ 9000/ 8000/ 7000 Series Desktop Processors Socket AM5 |
| Chipset | AMD B840 Chipset |
| CPU Socket | Socket AM5 |
| Form Factor | mATX Form Factor |
| Memory | 2 DIMMs, Dual Channel DDR5 – 8000+ MT/s (OC) |
| LAN | Realtek® 8125D 2.5G LAN |
| Audio | Realtek® ALC897 8-Channel (7.1) HD Audio with Audio Boost |
| MULTI-GPU | - |
| STORAGE | 2 x M.2 Gen4 x4 64Gbps slots 4 x SATA 6Gbps ports |
|---|---|
| Onboard Graphics | 1x HDMI™
|
| RAID | Supports RAID 0, RAID 1 and RAID 10 for SATA storage devices Supports RAID 0 and RAID 1 for M.2 NVMe storage devices |
| I/O (Rear) | Clear CMOS Button HDMI™ VGA USB 5Gbps Type-A 2.5G LAN Audio connectors Flash BIOS Button USB 2.0 |
| Expansion Slots | 1 x PCIe 4.0 x16 slot 1 x PCIe 3.0 x1 slot |
| USB (Front) | 4x USB 2.0 2x USB 5Gbps Type A 1x USB 5Gbps Type C |
| USB (Rear) | 2x USB 2.0 4x USB 5Gbps Type A |
| TYPE-C PORT | 1x USB 5Gbps Type C |
| Internal Connectors | 1x Power Connector(ATX_PWR) 1x Power Connector(CPU_PWR) 1x CPU Fan 2x System Fan 2x Front Panel (JFP) 1x Chassis Intrusion (JCI) 1x Front Audio (JAUD) 1x Com Port (JCOM) 3x Addressable V2 RGB LED connector (JARGB_V2) 1x RGB LED connector(JRGB) 1x TPM pin header(Support TPM 2.0) 4x USB 2.0 ports 2x USB 5Gbps Type A ports 1x USB 5Gbps Type C ports |
| Dimensions | 9.60" x 8.90" |
| Manufacturer Warranty | 3 Year |
The PRO B840M-B is a business-oriented mATX motherboard constructed around the latest AMD B840 chipset which supports AMD Ryzen 9000 / 8000 / 7000 series desktop processors, featuring PCIe 4.0, 2.5G LAN, DDR5 and Frozr design that delivers the capacity to support a broad spectrum of both cutting-edge and innovative hardware.
The PRO B840M-B motherboard supports AMD Ryzen 9000 / 8000 / 7000 Series processors.
Form Factor: mATX
Socket Type: AM5
Chipset: AMD B840
With exclusive Core Boost technology and EZ OC Tuning functions, the PRO B840M-B is able to sustain heavy CPU power loads to support system-demanding settings:
Digital PWM IC
7-Phase direct CPU power (P-PAK)
2-Phase SOC Power
1-Phase MISC Power
Frozr Sync: Connect and synchronize cooling with strategically placed pin-headers - including CPU fan header (2A) and system fans(1A).
Frozr Control: Manage speeds and temperature for all fans of your system in MSI Center with Cooling Wizard and Frozr AI Cooling.
Memory Boost: A fully-isolated DDR circuit delivers pure data signals for optimal gaming and overclocking performance.
High-Efficiency Mode: Enabling High-Efficiency-Mode in the MSI BIOS increases memory bandwidth and reduces latency. Four different modes allow users to find out the optimal configuration based on the quality of their memory modules.
EXPO Profiles in the MSI BIOS are MSI OC LAB optimized and can be easily enabled with auto power settings for optimized memory speed and stability.
*1DPC 1R Max. overclocking frequency 8000+ MT/s, supports AMD EXPO.
MSI PCI Express Steel Armor slots are secured to the motherboard with extra solder points to support the weight of heavy graphics cards. When every advantage in games counts, Steel Armor also shields the point of contact from electromagnetic interference.
1 x PCIe 4.0/3.0 x16 slot (with Steel Armor and EZ PCIe Clip II)
1 x PCIe 3.0 x1 slot
The PRO B840M-B motherboard features MSI's M.2 slots:
2 x Gen4 x4 64Gbps slots
The DIY Friendly designs optimize the assemble process and experience.
EZ PCIe Clip II: Allows for easy removal of the graphics card by pressing the tail-like lock with one finger, even in the cramped case spaces.
EZ M.2 Clip II: Install or remove the SSD with a simple push of the latch, without using any screws.
2.5G LAN: A Realtek 2.5Gbps LAN controller delivers a premium network experience.
HD Audio: 7.1-Channel High Definition Audio with Audio Boost.
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