ASUS Prime B840M-A WiFi-CSM
ASUS Prime B840M-A WiFi-CSM Specifications Review
ASUS Prime B840M-A WiFi-CSM by ASUS is a Standard-ATX form factor motherboard based on the mid-range B840 chipset and AM5 socket, providing a balanced set of features and connectivity. It is designed to support DDR5 memory, with 4 slots, a maximum capacity of 256 GB, and an overclocking speed of up to 7600 MHz.
VRM Quality
The ASUS Prime B840M-A WiFi-CSM has a basic VRM configuration, delivering 60 A across 8 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 ASUS Prime B840M-A WiFi-CSM offers a balanced 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 3 x16 slots . 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 3 M.2 slots 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 includes basic to moderate connectivity options, such as wireless networking with the Wi-Fi 6E standard, and wired Realtek 2.5Gb Ethernet ethernet supporting speeds up to 2500 Gbps. Bluetooth 5.3 support is included for common wireless devices. USB ports are adequate for everyday devices, and more details are available in the specs table.
For video output, this motherboard includes HDMI version 2.1 , DisplayPort version 1.4 . 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® ALC892/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
ASUS Prime B840M-A WiFi-CSM is a dependable choice with a respectable overall quality score of 52.20. It provides all the essential features and stable performance expected in a mainstream system, covering typical use cases without unnecessary extras.
This motherboard has a solid 58.3% 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 | ASUS |
|---|---|
| Motherboard Name | ASUS Prime B840M-A WiFi-CSM |
| Current Price Amazon | $170 |
| Amazon Price Updated | 1 day, 23 hours ago. |
| Motherboard Available | True |
| Chipset / Socket | B840 / AM5 |
| Form Factor | Standard-ATX |
VRM Configuration
| CPU Power Phases (Amps) | 8 (60 A) |
|---|---|
| Power Design | 8+2+1 |
Memory Information
| Type / Slots | DDR5 / 4 slots |
|---|---|
| Max Capacity / Max OC | 256 GB / 7600 MHz |
PCIe Slot Configuration
| Supported Version | PCIe 4.0 | ||||
|---|---|---|---|---|---|
| Slot Size | Physical Slots | Gen4 | Gen3 |
|---|---|---|---|
| x16 | 3 | 1 | 2 |
Storage Configuration
| M.2 Slot Count | 3 slots |
|---|---|
| M.2 Supported Lengths | 2280, 2242, 2260 |
| SATA Ports | 4 |
Onboard Audio Features
| Audio Chipset | Realtek® ALC892/ALC897 |
|---|---|
| Analog Audio Jacks | 3 jacks |
| Spatial/Surround Audio | ✔️ Rear Output Supports Spatial Audio |
Motherboard Display Outputs
| HDMI Output | HDMI - Version 2.1 (Max: 4K@60Hz) |
|---|---|
| DisplayPort Output | DisplayPort - Version 1.4 (Max: 8K@30Hz) |
USB and Thunderbolt Connectivity
Rear USB Ports
| USB 2.0 Type-A (480 Mbps) | 4 |
|---|---|
| USB 3.2 Gen 1 Type-C (5 Gbps) | 1 |
| USB 3.2 Gen 2 Type-A (10 Gbps) | 2 |
Front USB Ports
| USB 3.2 Gen 1 Type-C (5 Gbps) | 1 |
|---|---|
| Power Delivery (W) | 15W |
Internal USB Headers
| USB 2.0 Header (480 Mbps) | 4 |
|---|---|
| USB 3.2 Gen 1 Header (5 Gbps) | 2 |
Networking Information
| Ethernet | Chipset: Realtek 2.5Gb Ethernet LAN Ports: 1 |
|---|---|
| Wi-Fi |
Version: Wi-Fi 6E Frequency Bands: 2.4/5/6GHz Antenna Connectors: 2 |
| Bluetooth |
Version: 5.3 |
Button Features
| Buttons |
BIOS Flashback |
|---|
Quality & Features
Additional Information
| RAM | Supports AMD Extended Profiles for Overclocking (EXPO™) and ASUS Enhanced Memory Profile (AEMP). Supports Un-buffered DIMMs. Supported memory types, data rate, and number of DRAM modules vary depending on the CPU and memory configuration. Non-ECC, un-buffered DDR5 memory supports On-Die ECC function. |
|---|---|
| Display | Graphics specifications may vary between CPU types. Please refer to AMD CPU specifications. |
| Expansion | The primary PCIe 4.0 x16 slot's operating mode depends on the installed CPU: it supports x16 mode with AMD Ryzen 9000 & 7000 Series, and x8/x4 mode with AMD Ryzen 8000 Series. The two PCIe 3.0 x16 slots from the chipset support x1 mode only. Refer to the manufacturer's support site for the PCIe bifurcation table. |
| Storage |
M.2 Slot Details:
AMD RAIDXpert2 Technology is supported. The available RAID levels depend on the CPU series: Ryzen 9000 supports RAID 0/1/5/10; Ryzen 7000 supports RAID 0/1/10; Ryzen 8000 supports RAID 0/1. |
| Audio | Features Realtek 7.1 Surround Sound High Definition Audio CODEC with audio shielding, premium audio capacitors, and dedicated audio PCB layers. Supports jack-detection, multi-streaming, front panel jack-retasking, and up to 24-Bit/192 kHz playback. A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output. |
| Networking | WiFi 6E 6GHz regulatory may vary between countries, supported only in Windows 11 or later. The Bluetooth® version may vary, please refer to the Wi-Fi module manufacturer's website for the latest specifications. |
| Buttons | The motherboard includes a Clear CMOS header, but not a dedicated button. |
| Dimensions | 24.4cm x 24.4cm |
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.
ASUS Prime B840M-A WiFi-CSM 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) |
|---|---|---|---|---|---|---|---|---|
|
$155
|
↓
-0.2%
|
53.6%
|
24.0%
|
80.0%
|
65.0%
|
59.0%
|
40.0%
|
65.5%
|
|
|
$0
|
0.0%
|
53.4%
|
25.0%
|
84.0%
|
75.0%
|
38.0%
|
45.0%
|
N/A | |
|
$178
|
↑
26.8%
|
53.2%
|
23.0%
|
76.0%
|
59.0%
|
65.0%
|
43.0%
|
56.9%
|
|
|
$110
|
↓
-8.3%
|
52.8%
|
20.0%
|
78.0%
|
66.0%
|
60.0%
|
40.0%
|
91.2%
|
|
|
$195❗
|
↓
-0.8%
|
52.2%
|
25.0%
|
78.0%
|
62.0%
|
51.0%
|
45.0%
|
51.0%
|
|
|
$170
|
↓
-4.8%
|
52.2%
|
25.0%
|
73.0%
|
67.0%
|
51.0%
|
45.0%
|
58.3%
|
|
|
$140
|
0.0%
|
51.8%
|
20.0%
|
73.0%
|
66.0%
|
60.0%
|
40.0%
|
70.3%
|
|
|
$170
|
0.0%
|
51.0%
|
22.0%
|
71.0%
|
64.0%
|
58.0%
|
40.0%
|
57.0%
|
|
|
$130
|
0.0%
|
51.0%
|
22.0%
|
71.0%
|
64.0%
|
58.0%
|
40.0%
|
74.6%
|
Motherboard Comparison and Detail Specifications Table
| Specification |
No image available |
Perf Chart | |||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Price |
$155
|
↓
-0.2%
|
$0
|
0.0%
|
$178
|
↑
26.8%
|
$110
|
↓
-8.3%
|
$195❗
|
↓
-0.8%
|
$170
|
↓
-4.8%
|
$140
|
0.0%
|
$170
|
0.0%
|
$130
|
0.0%
|
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| Manufacturer | GIGABYTE | ASUS | MSI | ASRock | Asus | ASUS | ASRock | MSI | MSI | ||||||||||||||||||||||||||||||||||||||||||||||
| Chip/Socket | B850M / AM5 | AMD B850 / AM5 | B650M / AM5 | B850M / AM5 | B650M-E / AM5 | B840 / AM5 | B650M / AM5 | B840 / AM5 | B840 / AM5 | ||||||||||||||||||||||||||||||||||||||||||||||
| Form | Micro-ATX | Micro-ATX | Micro-ATX | Micro-ATX | Micro-ATX | Standard-ATX | Micro-ATX | Standard-ATX | Standard-ATX | ||||||||||||||||||||||||||||||||||||||||||||||
| CPU Phases | 8 (60 A) | 8 (60 A) | 8 (55 A) | 8 (50 A) | 8 (60 A) | 8 (60 A) | 8 (50 A) | 7 (60 A) | 7 (60 A) | ||||||||||||||||||||||||||||||||||||||||||||||
| PWR Design | 8+2+2 | 8 + 2 + 1 | 8+2 | 8+2+1 | 8(60A)+2(60A)+1 | 8+2+1 | 8+2+1 | 7+2+1 | 7+2+1 | ||||||||||||||||||||||||||||||||||||||||||||||
| Mem Slots | 4 / DDR5 | 2 / DDR5 | 4 / DDR5 | 4 / DDR5 | 4 / DDR5 | 4 / DDR5 | 4 / DDR5 | 4 / DDR5 | 4 / DDR5 | ||||||||||||||||||||||||||||||||||||||||||||||
| Max Mem | 256 GB / 8200 MHz | 128 GB / 8400 MHz | 256 GB / 7200 MHz | 256 GB / 8000 MHz | 192 GB / 7600 MHz | 256 GB / 7600 MHz | 256 GB / 8000 MHz | 256 GB / 8000 MHz | 256 GB / 8000 MHz | ||||||||||||||||||||||||||||||||||||||||||||||
| PCIe | PCIe 5.0 | PCIe 5.0 | PCIe 4.0 | PCIe 5.0 | PCIe 4.0 | PCIe 4.0 | PCIe 5.0 | PCIe 4.0 | PCIe 4.0 | ||||||||||||||||||||||||||||||||||||||||||||||
| PCIe Slots | 1x16 Gen5 | 1x16 Gen3 | 1x16 Gen5 | 1x16 Gen4 | 2x16 Gen4 | 1x1 Gen3 | 1x16 Gen5 | 1x4 Gen4 | 1x16 Gen4 | 2x1 Gen4 | 1x16 Gen4 | 2x16 Gen3 | 1x16 Gen5 | 1x4 Gen4 | 1x16 Gen4 | 4x16 Gen3 | 1x16 Gen4 | 4x16 Gen3 | ||||||||||||||||||||||||||||||||||||||||||||||
| M.2 | 2 | 2 | 2 | 3 | 2 | 3 | 3 | 2 | 2 | ||||||||||||||||||||||||||||||||||||||||||||||
| SATA | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | ||||||||||||||||||||||||||||||||||||||||||||||
| Audio | Realtek® Audio CODEC | Realtek® ALC892/ALC897 | Realtek® ALC897 Codec | Realtek ALC897 Audio Codec | Realtek® ALC892/ALC897 | Realtek® ALC892/ALC897 | Realtek ALC897 Audio Codec | Realtek® ALC897 | Realtek® 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) | ✔️ (1.4) | ❌ | ❌ | ||||||||||||||||||||||||||||||||||||||||||||||
| LAN | Realtek® 2.5GbE LAN chip… (1 ports) | 1 x Realtek 2.5Gb Ethern… (1 ports) | Realtek® 8125BG 2.5G (1 ports) | 2.5 Gigabit LAN 10/100/1… (1 ports) | Realtek 2.5Gb Ethernet (1 ports) | Realtek 2.5Gb Ethernet (1 ports) | 2.5 Gigabit LAN 10/100/1… (1 ports) | Realtek® 8125BG 2.5G LAN (1 ports) | Realtek® 8125D 2.5G LAN (1 ports) | ||||||||||||||||||||||||||||||||||||||||||||||
| Wi-Fi | Wi-Fi 6E | ❌ | Wi-Fi 6E | Wi-Fi Wi-Fi 6E | Wi-Fi 6 | Wi-Fi 6E | Wi-Fi 6E | Wi-Fi 7 | Wi-Fi 7 | ||||||||||||||||||||||||||||||||||||||||||||||
| BT | v5.3 | ❌ | v5.3 | v5.2 | v5.2 | v5.3 | v5.2 | v5.4 | v5.4 | Rear USB |
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|
|
|
|
|
|
|
|
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| USB Headers |
|
|
|
|
|
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|
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| Front USB |
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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 |
|---|---|---|---|---|---|---|---|---|---|
|
$316
|
↓
0.0%
|
63.0%
|
76.4%
|
65 W / 88 W | 12 / 0 / 24 | 1024.0 kB / 64.0 MB | 3.70 GHz / 5.40 GHz | Raphael | Radeon Graphics | |
|
$0
|
0.0%
|
51.9%
|
80.9%
|
65 W / 88 W | 8 / 0 / 16 | 1024.0 kB / 32.0 MB | 3.80 GHz / 5.50 GHz | Granite Ridge | None | |
|
$303
|
0.0%
|
51.9%
|
80.9%
|
65 W / 88 W | 8 / 0 / 16 | 1024.0 kB / 32.0 MB | 3.80 GHz / 5.50 GHz | Granite Ridge | Radeon Graphics | |
|
$190
|
↓
-32.1%
|
47.8%
|
78.1%
|
65 W / 88 W | 8 / 0 / 16 | 1024.0 kB / 32.0 MB | 3.80 GHz / 5.30 GHz | Raphael | Radeon Graphics | |
|
$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 | |
|
$185
|
0.0%
|
43.7%
|
80.4%
|
65 W / 88 W | 6 / 0 / 12 | 1024.0 kB / 32.0 MB | 3.90 GHz / 5.40 GHz | Granite Ridge | Radeon Graphics | |
|
$0
|
0.0%
|
41.0%
|
77.9%
|
65 W / 88 W | 6 / 0 / 12 | 1024.0 kB / 32.0 MB | 3.80 GHz / 5.00 GHz | Granite Ridge | None | |
|
$240
|
0.0%
|
38.8%
|
86.0%
|
65 W / 88 W | 6 / 0 / 12 | 1024.0 kB / 96.0 MB | 4.10 GHz / 4.70 GHz | Raphael | Radeon Graphics | |
|
$169
|
↓
-0.6%
|
38.2%
|
75.3%
|
65 W / 88 W | 6 / 0 / 12 | 1024.0 kB / 32.0 MB | 3.80 GHz / 5.10 GHz | Raphael | Radeon Graphics | |
|
$103❗
|
0.0%
|
37.8%
|
74.1%
|
65 W / 88 W | 6 / 0 / 12 | 1024.0 kB / 32.0 MB | 3.70 GHz / 5.00 GHz | Raphael | 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 | |
|
$0
|
0.0%
|
34.9%
|
73.1%
|
65 W / 88 W | 6 / 0 / 12 | 1024.0 kB / 32.0 MB | 3.70 GHz / 4.70 GHz | Raphael | None | |
|
$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:
Supports up to 7600+MT/s (OC) with Ryzen™ 9000 & 8000 & 7000 Series Processors, ECC and Non-ECC, Un-buffered DIMM*
Dual channel memory architecture
Supports AMD Extended Profiles for Overclocking (EXPO™)
ASUS Enhanced Memory Profile (AEMP)
* Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration, for more information please refer to CPU/Memory Support list under the Support tab of product information site or visit https://www.asus.com/support/download-center/. Adjustments will be made based on the specifications of mass-produced memory products available on the market.
* Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.
Graphics:
1 x HDMI™ port***
* Graphics specifications may vary between CPU types. Please refer to AMD CPU specifications.
** Supports max. 8K@30Hz as specified in DisplayPort 1.4.
*** Supports 4K@60Hz as specified in HDMI 2.1.
Storage:
AMD Ryzen™ 9000 & 7000 Series Desktop Processors
M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode)
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
AMD Ryzen™ 8000 Series Desktop Processors
M.2_1 slot (Key M), type 2280 (supports PCIe 4.0 x4 mode)
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4/x2 mode)*
AMD B840 Chipset
M.2_3 slot (Key M), type 2280 (supports PCIe 3.0 x4 mode)
4 x SATA 6Gb/s ports
* Specifications vary by CPU types.
AMD RAIDXpert2 Technology
Ryzen™ 9000 Series Processors: RAID 0/1/5/10
Ryzen™ 8000 Series Processors: RAID 0/1
Ryzen™ 7000 Series Processors: RAID 0/1/10
Expansion Slots:
1 x PCIe 4.0 x16 slot (supports x16 mode)
AMD Ryzen™ 8000 Series Desktop Processors
1 x PCIe 4.0 x16 slot (supports x8/x4 mode)**
AMD B840 Chipset
2 x PCIe 3.0 x16 slots (support x1 mode)
* Please check the PCIe bifurcation table on the support site (https://www.asus.com/support/FAQ/1037507/).
** Specifications vary by CPU types.
- To ensure compatibility of the device installed, please refer to https://www.asus.com/support/download-center/ for the list of supported peripherals.
USB:
2 x USB 10Gbps ports (2 x Type-A)
1 x USB 5Gbps port (1 x USB Type-C®)
4 x USB 2.0 ports (4 x Type-A)
Front USB (Total 7 ports)
1 x USB 5Gbps connector (supports USB Type-C®)
1 x USB 5Gbps header supports 2 additional USB 5Gbps ports
2 x USB 2.0 headers support 4 additional USB 2.0 ports
* USB Type-C® power delivery output: max. 5V/3A
Internal I/O:
1 x 4-pin CPU Fan header
1 x 4-pin CPU OPT Fan header
1 x 4-pin AIO Pump header
3 x 4-pin Chassis Fan headers
Power Related
1 x 24-pin Main Power connector
1 x 8-pin +12V CPU Power connector
Storage Related
3 x M.2 slots (Key M)
4 x SATA 6Gb/s ports
USB
1 x USB 5Gbps connector (supports USB Type-C® )
1 x USB 5Gbps header supports 2 additional USB 5Gbps ports
2 x USB 2.0 headers support 4 additional USB 2.0 ports
Miscellaneous
3 x Addressable Gen 2 headers
1 x Clear CMOS header
1 x COM Port header
1 x Front Panel Audio header (F_AUDIO)
1 x S/PDIF Out header
1 x SPI TPM header (14-1 pin)
1 x 10-1 pin Front Panel System header
Back Panel I/O:
1 x USB 5Gbps port (1 x USB Type-C®)
4 x USB 2.0 ports (4 x Type-A)
2 x DisplayPort
1 x HDMI™ port
1 x Wi-Fi module
1 x Realtek 2.5Gb Ethernet port
3 x Audio jacks
1 x BIOS FlashBack™ button
WiFi:
2x2 Wi-Fi 6E (802.11ax)
Supports 2.4/5/6GHz frequency band*
Bluetooth® v5.3**
* WiFi 6E 6GHz regulatory may vary between countries, supported only in Windows 11 or later.
** The Bluetooth® version may vary, please refer to the Wi-Fi module manufacturer's website for the latest specifications.
Audio:
- Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking
- Supports up to 24-Bit/192 kHz playback
Audio Features
- Audio Shielding
- Premium audio capacitors
- Dedicated audio PCB layers
* A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.
Special Features:
- DIGI+ VRM
- LANGuard
- Overvoltage protection
- SafeSlot Core+
- Stainless-steel back I/O
ASUS Q-Design
- Q-Antenna
- Q-Dashboard
- Q-DIMM
- Q-LED Core
- Q-Slot
ASUS Thermal Solution
- M.2 heatsink
- VRM heatsink design
ASUS EZ DIY
- BIOS FlashBack™ button
- BIOS FlashBack™ LED
- Pre-mounted I/O shield
Aura Sync
- Addressable Gen 2 headers
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