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ASRock · AM5 · B850M

ASRock AMD B850M X

Micro-ATX · DDR5 · 2 DIMMs · 6-phase VRM

Quality
47
VRM
18
Value
33
Amazon
$270
ASRock AMD B850M X
View ASRock AMD B850M X Gallery in high resolution
$270
Available Updated 3 days, 6 hours ago
Overall46.6
VRM18.0
Chipset78.0
Expansion / storage63.0
Connectivity34.0
Audio40.0
Quality / price32.8
$270 on Amazon Motherboard table Compare this motherboard

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Written analysis

ASRock AMD B850M X at a glance

The ASRock AMD B850M X uses the Micro-ATX form factor, AM5 socket, and B850M chipset. This is a balanced mainstream platform: enough expansion and connectivity for a performance PC without paying only for flagship extras.

Memory support is DDR5 across 2 DIMM slots, with up to 128 GB and rated overclocked speeds up to 8200 MT/s. ECC modules are accepted, subject to CPU support. XMP / EXPO memory-profile support is recorded for easier tuning.

Best fit: a mainstream gaming, home, or office system with moderate expansion needs.

Power delivery

The calculated VRM score is 18.0, placing the power delivery in the basic class. The board lists 6 CPU power phases, 60 A power stages in a 6+1+1 layout. CPU power input is listed as 1. Keep it paired with lower-power processors and avoid sustained overclocked loads.

Expansion and storage

The expansion and storage score is 63.0: balanced . The platform supports PCIe 4.0. Physical expansion includes 2 ×16 slots, and 1 ×1.

On-board storage consists of 2 M.2 slots and 4 SATA ports. Supported M.2 lengths are listed as 2280, 2260. The two-slot layout covers a typical OS-and-games or OS-and-project-drive setup.

Connectivity and rear I/O

The connectivity score is 34.0, rated essential. There is no recorded onboard Wi-Fi ; wired networking is 2.5 Gigabit LAN 10/100/1000/2500 Mb/s at up to 2500 Mbps. The recorded USB provision is 6 rear connections and 7 front-panel connections. The specification sheet below separates every USB speed and connector type.

Display connectivity includes HDMI 2.1, DisplayPort 1.4. These motherboard outputs require a processor with integrated graphics.

Audio

The audio score is 40.0. This is a standard onboard solution using Realtek ALC897 Audio Codec. It covers normal gaming and communication; demanding headphones or production work still benefit from an external interface. The rear panel has 3 analogue jacks.

Buying verdict

Overall quality is 46.60, a basic but usable result for office, media, and budget gaming systems.

At the recorded Amazon price, the quality-to-price score is 32.8. The nearby-board comparison below may reveal a better-equipped option at a similar price.

Board data

Full specifications

Platform, expansion, storage, rear I/O, internal headers, networking, audio, and board controls in one sheet.

General

Manufacturer
ASRock
Motherboard
ASRock AMD B850M X
Chipset / socket
B850M / AM5
Form factor
Micro-ATX
Launch price
—
Amazon price
$270
Availability
In stock
Price updated
3 days, 6 hours ago

VRM

CPU phases
6 (60 A)
Power design
6+1+1
EPS connector
1

Memory

Type / slots
DDR5 / 2 DIMMs
Max capacity / OC
128 GB / 8200 MT/s
Per DIMM
64 GB
XMP / EXPO
Yes
ECC
Modules supported

PCIe

Supported version
PCIe 4.0
x16 physical
2
x16 Gen 4
2
x1 physical
1
x1 Gen 4
1

Storage

M.2 slots
2
M.2 lengths
2280, 2260
SATA ports
4

Display outputs

HDMI
Yes · 2.1 · 4K 120Hz
DisplayPort
Yes · 1.4 · 4K 120Hz
USB-C DisplayPort
No

USB

Rear USB 2.0
2
Rear USB 3.2 Gen 1 Type-A 5 Gbps
3
Rear USB 3.2 Gen 1 Type-C 5 Gbps
1
Front USB 2.0
4
Front USB 3.2 Gen 1 Type-A 5 Gbps
2
Front USB 3.2 Gen 1 Type-C 5 Gbps
1
Header USB 2.0
4
Header USB 3.2 Gen 1 Type-A 5 Gbps
3

Networking

Ethernet
2.5 Gigabit LAN 10/100/1000/2500 Mb/s
LAN ports
1
LAN speed
2500 Mbps
Wi-Fi
Not included
Antenna connectors
2
Bluetooth
No

Audio

Chipset
Realtek ALC897 Audio Codec
Analog jacks
3
Gold-plated jacks
No
Optical S/PDIF
No
Spatial audio
Rear output

Buttons

BIOS flashback
Yes
Clear CMOS
No
Q-Flash Plus
No
Smart button
No
Onboard start / reset
No

Additional information

Memory notes
Supports un-buffered memory and EXTended Profiles for Overclocking (EXPO) memory modules. Please refer to the Memory Support List on ASRock's website for more information.
Display notes
Features Integrated AMD RDNA™ graphics, but actual support may vary by CPU. The HDMI port is TMDS/FRL 8G Compatible and supports HDR and HDCP 2.3. The DisplayPort port supports DSC (compressed) and HDCP 2.3.
Expansion notes
The primary x16 slot (PCIE1) speed depends on the installed CPU: it runs at Gen4x16 with 9000/7000 series, Gen4x8 with 8000 (Phoenix 1) series, and Gen4x4 with 8000 (Phoenix 2) series. The second x16 slot (PCIE3) is electrically wired to run at x4 mode.
M2_1
5.0 4 · 2280 · CPU — The slot's speed depends on the installed CPU. It operates at PCIe 5.0 x4 with 9000 and 7000 series processors, and at PCIe 4.0 x4 with 8000 (Phoenix 1 and Phoenix 2) series processors.
M2_2
4.0 4 · 2260, 2280 · CPU — The slot's speed depends on the installed CPU. It operates at PCIe 4.0 x4 with 9000, 7000, and 8000 (Phoenix 1) series processors, and at PCIe 4.0 x2 with 8000 (Phoenix 2) series processors.
Storage notes
Supports NVMe SSD as boot disks. M2_1 is the first priority for M.2 installation.
USB notes
All USB ports support ESD Protection
Audio notes
Features 7.1 CH HD Audio and Nahimic Audio. The rear panel has jacks for Line in, Front Speaker, and Microphone.
Networking notes
Features 2 x Antenna Mounting Points.
Fan / RGB headers
2 CPU · — OPT · 1 AIO · 3 chassis · 3 ARGB · 1 RGB
Thermal sensors
1
Other headers
Front audio · System panel · TPM
Dimensions
24.4cm x 24.4cm

Extracted notes sit here. Official manufacturer copy is at the bottom of the page.

Amazon

Price history

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Vendor copy

Official manufacturer data

Raw manufacturer text kept for reference. Structured specs above are extracted from this copy and are the source for scores and tables.

Memory

- Dual Channel DDR5 Memory Technology
- 2 x DDR5 DIMM Slots
- Supports DDR5 ECC/non-ECC, un-buffered memory up to 8200+(OC)*
- Max. capacity of system memory: 128GB
- Supports Extreme Memory Profile (XMP) and EXTended Profiles for Overclocking (EXPO) memory modules

*Please refer to Memory Support List on ASRock's website for more information.

Graphics

Integrated AMD RDNA™ graphics (Actual support may vary by CPU)
- 1 x HDMI 2.1 TMDS/FRL 8G Compatible, supports HDR, HDCP 2.3 and max. resolution up to 4K 120Hz
- 1 x DisplayPort 1.4 with DSC (compressed), supports HDCP 2.3 and max. resolution up to 4K 120Hz

Expansion slots

CPU:
- 1 x PCIe 4.0 x16 Slot (PCIE1), supports x16 mode*
Chipset:
- 1 x PCIe 4.0 x1 Slot (PCIE2)*
- 1 x PCIe 4.0 x16 Slot (PCIE3), supports x4 mode*
- 1 x M.2 Socket (Key E), supports type 2230 WiFi/BT PCIe WiFi module

*PCIE1 will run at Gen4x16 with 9000 and 7000 series processors, Gen4x8 with 8000 (Phoenix 1) series processors and Gen4x4 with 8000 (Phoenix 2) series processors.
Supports NVMe SSD as boot disks

Storage

CPU:
- 1 x Blazing M.2 Socket (M2_1, Key M), supports type 2280 PCIe Gen5x4 (128 Gb/s) mode*
- 1 x Hyper M.2 Socket (M2_2, Key M), supports type 2260/2280 PCIe Gen4x4 (64 Gb/s) mode*
Chipset:
- 4 x SATA3 6.0 Gb/s Connectors

*Supports NVMe SSD as boot disks
M2_1 is the first priority for M.2 installation.
M2_1 will run at Gen5x4 with 9000 and 7000 series processors and Gen4x4 with 8000 (Phoenix 1 and Phoenix 2) series processors.
M2_2 will run at Gen4x4 with 9000 and 7000 series processors, Gen4x4 with 8000 (Phoenix 1) series processors and Gen4x2 with 8000 (Phoenix 2) series processors.

USB

CPU:
- 3 x USB 3.2 Gen1 Type-A (Rear)
- 1 x USB 2.0 (Rear (USB_2))
Chipset:
- 2 x USB 3.2 Gen1 Type-C (1 Rear, 1 Front)
- 2 x USB 3.2 Gen1 Type-A (Front)
- 5 x USB 2.0 (1 Rear (USB_1), 4 Front)

*All USB ports support ESD Protection

Internal I/O

- 1 x Thermistor Cable Header
- 1 x SPI TPM Header
- 1 x Power LED and Speaker Header
- 1 x RGB LED Header*
- 3 x Addressable LED Headers**
- 2 x CPU Fan Connectors (4-pin) (Smart Fan Speed Control)***
- 3 x Chassis/Water Pump Fan Connectors (4-pin) (Smart Fan Speed Control)***
- 1 x AIO Pump Fan Connector (4-pin) (Smart Fan Speed Control)***
- 1 x 24 pin ATX Power Connector
- 1 x 8 pin 12V Power Connector (Hi-Density Power Connector)
- 1 x Front Panel Audio Connector
- 2 x USB 2.0 Headers (Support 4 USB 2.0 ports)
- 1 x USB 3.2 Gen1 Header (Supports 2 USB 3.2 Gen1 ports)
- 1 x Front Panel Type C USB 3.2 Gen1 Header

*Supports in total up to 12V/3A, 36W LED Strip

**Support in total up to 5V/3A, 15W LED Strip

***CPU_FAN1 supports the fan power up to 1A (12W).

***CPU_FAN2, CHA_FAN1~3 and AIO_PUMP support the fan power up to 3A (36W).
CPU_FAN2, CHA_FAN1~3 and AIO_PUMP can auto detect if 3-pin or 4-pin fan is in use.

Rear I/O

- 2 x Antenna Mounting Points
- 1 x HDMI Port
- 1 x DisplayPort 1.4
- 1 x USB 3.2 Gen1 Type-C Port
- 3 x USB 3.2 Gen1 Type-A Ports
- 2 x USB 2.0 Ports
- 1 x RJ-45 LAN Port
- 1 x BIOS Flashback Button
- HD Audio Jacks: Line in / Front Speaker / Microphone

Audio

- 7.1 CH HD Audio (Realtek ALC897 Audio Codec)
- Nahimic Audio

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