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ASRock · AM5 · B850

ASRock AMD AM5 B850 Pro-A

ATX · DDR5 · 4 DIMMs · 14-phase VRM

Quality
59
VRM
54
Value
80
Amazon
$140
ASRock AMD AM5 B850 Pro-A
View ASRock AMD AM5 B850 Pro-A Gallery in high resolution
$140
Available Updated 3 days, 15 hours ago Prime FBA
Overall58.8
VRM54.0
Chipset69.0
Expansion / storage78.0
Connectivity53.0
Audio40.0
Quality / price79.8
$140 on Amazon Motherboard table Compare this motherboard

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Written analysis

ASRock AMD AM5 B850 Pro-A at a glance

The ASRock AMD AM5 B850 Pro-A uses the ATX form factor, AM5 socket, and B850 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 4 DIMM slots, with up to 192 GB and rated overclocked speeds up to 7200 MT/s. 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 54.0, placing the power delivery in the mid-range class. The board lists 14 CPU power phases, 80 A power stages in a 14+2+1 layout. CPU power input is listed as 2. It is a sensible match for mainstream processors, with conservative tuning on higher-power chips.

Expansion and storage

The expansion and storage score is 78.0: well equipped . The platform supports PCIe 5.0. Physical expansion includes 2 ×16 slots.

On-board storage consists of 4 M.2 slots and 4 SATA ports. Supported M.2 lengths are listed as 2230, 2242, 2260, 2280. That is enough NVMe capacity for a multi-drive gaming or creator setup without immediately relying on an add-in card.

Connectivity and rear I/O

The connectivity score is 53.0, rated adequate . 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 12 rear connections and 6 front-panel connections. The specification sheet below separates every USB speed and connector type.

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 58.80, a mainstream result. The essential platform features are covered, while premium I/O and tuning extras are more selective.

At the recorded Amazon price, the quality-to-price score is 79.8—an excellent value relative to the other boards in the catalog.

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 AM5 B850 Pro-A
Chipset / socket
B850 / AM5
Form factor
ATX
Launch price
—
Amazon price
$140
Availability
In stock
Price updated
3 days, 15 hours ago

VRM

CPU phases
14 (80 A)
Power design
14+2+1
EPS connector
2

Memory

Type / slots
DDR5 / 4 DIMMs
Max capacity / OC
192 GB / 7200 MT/s
Per DIMM
48 GB
XMP / EXPO
Yes

PCIe

Supported version
PCIe 5.0
x16 physical
2
x16 Gen 5
1
x16 Gen 4
1

Storage

M.2 slots
4
M.2 lengths
2230, 2242, 2260, 2280
SATA ports
4

Display outputs

HDMI
No
DisplayPort
No
USB-C DisplayPort
No

USB

Rear USB 2.0
6
Rear USB 3.2 Gen 1 Type-A 5 Gbps
4
Rear USB 3.2 Gen 1 Type-C 5 Gbps
1
Rear USB 3.2 Gen 2 Type-C 10 Gbps
1
Front USB 2.0
3
Front USB 3.2 Gen 1 Type-A 5 Gbps
2
Front USB 3.2 Gen 2×2 Type-C 20 Gbps
1
Header USB 2.0
3
Header USB 3.2 Gen 1 Type-A 5 Gbps
2
Header USB 3.2 Gen 2×2 Type-C 20 Gbps
1

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
Features OptiMem II. Supported memory types, data rate(Speed), and number of DRAM modules vary depending on the CPU and memory configuration. Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.
Expansion notes
PCIE1 will run at Gen5x16 with 9000 and 7000 series processors, Gen4x8 with 8000 (Phoenix 1) series processors and Gen4x4 with 8000 (Phoenix 2) series processors. The second x16 slot (PCIE2) supports x4 mode. If M2_3 is occupied, PCIE2 will be disabled. The primary VGA PCIe Slot (PCIE1) features 15μ Gold Contact.
M2_1
5.0 4 · 2280 · CPU — Runs at Gen5x4 with 9000 and 7000 series processors and Gen4x4 with 8000 (Phoenix 1 and Phoenix 2) series processors.
M2_2
4.0 4 · 2280 · CPU — Runs at Gen4x4 with 9000 and 7000 series processors, Gen4x4 with 8000 (Phoenix 1) series processors and Gen4x2 with 8000 (Phoenix 2) series processors.
M2_3
4.0 4 · 2230, 2242, 2260, 2280 · Chipset — If M2_3 is occupied, PCIE2 will be disabled.
M2_4
3.0 4 · 2280 · Chipset — If SATA3_1 or SATA3_2 is occupied, M2_4 will downgrade to Gen3x2 mode.
Storage notes
Supports NVMe SSD as boot disks. M2_1 is the first priority for M.2 installation. 2 SATA3 ports are provided by the chipset and 2 are provided by the ASMedia ASM1061 controller.
USB notes
One rear USB 3.2 Gen1 Type-C port supports DP-alt mode (DP1.4a).
Audio notes
7.1 CH HD Audio; Nahimic Audio
Networking notes
2 x Antenna Mounting Points
Fan / RGB headers
2 CPU · — OPT · 1 AIO · 4 chassis · 3 ARGB · 1 RGB
Other headers
Front audio · System panel · TPM
Dimensions
30.5 cm x 24.4 cm

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

Amazon

Price history

Nearby quality

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VRM fit

VRM-appropriate CPUs

AM5 processors whose TDP sits in this board’s VRM window. Socket match is required; chipset extras still matter on sTR5. This is a power-delivery filter, not a ranked CPU guide.

Open AM5 CPUs in the CPU table

Discussion

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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.

Graphics

- Dual Channel DDR5 Memory Technology
- 4 x DDR5 DIMM Slots
- Supports DDR5 ECC/non-ECC, un-buffered memory up to 8000+(OC)
- Max. capacity of system memory: 256GB
- Supports Extreme Memory Profile (XMP) and EXTended Profiles for Overclocking (EXPO) memory modules

Expansion slots

CPU:
- 1 x PCIe 5.0 x16 Slot (PCIE1), supports x16 mode*
Chipset:
- 1 x PCIe 4.0 x16 Slot (PCIE2), supports x4 mode*
- 1 x M.2 Socket (Key E), supports type 2230 WiFi/BT PCIe WiFi module
- 15μ Gold Contact in VGA PCIe Slot (PCIE1) * PCIE1 will run at Gen5x16 with 9000 and 7000 series processors, Gen4x8 with 8000 (Phoenix 1) series processors and Gen4x4 with 8000 (Phoenix 2) series processors. If M2_3 is occupied, PCIE2 will be disabled. 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 2280 PCIe Gen4x4 (64 Gb/s) mode*
Chipset:
- 1 x Hyper M.2 Socket (M2_3, Key M), supports type 2230/2242/2260/2280 PCIe Gen4x4 (64 Gb/s) mode*
- 1 x Ultra M.2 Socket (M2_4, Key M), supports type 2280 PCIe Gen3x4 (32 Gb/s) mode*
- 2 x SATA3 6.0 Gb/s Connectors
ASMedia ASM1061:
- 2 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. If M2_3 is occupied, PCIE2 will be disabled. If SATA3_1 or SATA3_2 is occupied, M2_4 will downgrade to Gen3x2 mode.

USB

CPU:
- 1 x USB 3.2 Gen2 Type-C (Rear)
- 1 x USB 3.2 Gen1 Type-C (Rear)
- 2 x USB 3.2 Gen1 Type-A (Rear (USB32_1 and USB32_2))
Chipset:
- 1 x USB 3.2 Gen2x2 Type-C (Front)
- 4 x USB 3.2 Gen1 Type-A (2 Rear (USB32_3 and USB32_4), 2 Front)
- 9 x USB 2.0 (6 Rear, 3 Front)

Internal I/O

- 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)***
- 4 x Chassis 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
- 2 x 8 pin 12V Power Connectors (Hi-Density Power Connector)
- 1 x Front Panel Audio Connector
- 2 x USB 2.0 Headers (Support 3 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 Gen2x2 Header (20 Gb/s)

Rear I/O

- 2 x Antenna Mounting Points
- 1 x HDMI Port
- 1 x USB 3.2 Gen2 Type-C Port (10 Gb/s)
- 1 x USB 3.2 Gen1 Type-C Port (DP-alt mode supports DP1.4a)
- 4 x USB 3.2 Gen1 Type-A Ports
- 6 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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