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ASUS · LGA 1851 · B860M

ASUS Prime B860M-K

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

Quality
46
VRM
17
Value
0
Amazon
—
—
Unavailable
Overall46.2
VRM17.0
Chipset67.0
Expansion / storage60.0
Connectivity42.0
Audio45.0
Quality / price0.0
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Written analysis

ASUS Prime B860M-K at a glance

The ASUS Prime B860M-K uses the Micro-ATX form factor, LGA 1851 socket, and B860M 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 8800 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 17.0, placing the power delivery in the basic class. The board lists 6 CPU power phases, 55 A power stages in a 6+1+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 60.0: balanced . The platform supports PCIe 4.0. Physical expansion includes 1 ×16 slot, and 2 ×1.

On-board storage consists of 2 M.2 slots and 4 SATA ports. Supported M.2 lengths are listed as 2242, 2260, 2280. 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 42.0, rated essential. There is no recorded onboard Wi-Fi ; wired networking is 1 x Realtek 2.5Gb Ethernet at up to 2500 Mbps. The recorded USB provision is 6 rear connections and 1 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 45.0. This is a standard onboard solution using Realtek® ALC892/ALC897. 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 46.20, a basic but usable result for office, media, and budget gaming systems.

Board data

Full specifications

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

General

Manufacturer
ASUS
Motherboard
ASUS Prime B860M-K
Chipset / socket
B860M / LGA 1851
Form factor
Micro-ATX
Launch price
—
Amazon price
—
Availability
Unavailable

VRM

CPU phases
6 (55 A)
Power design
6+1+1+1
EPS connector
1

Memory

Type / slots
DDR5 / 2 DIMMs
Max capacity / OC
128 GB / 8800 MT/s
Per DIMM
64 GB
XMP / EXPO
Yes

PCIe

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

Storage

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

Display outputs

HDMI
Yes · 2.1 · 4K@60Hz
DisplayPort
Yes · 1.4 · 4K@60Hz
USB-C DisplayPort
No

USB

Rear USB 2.0
3
Rear USB 3.2 Gen 1 Type-A 5 Gbps
2
Rear USB 3.2 Gen 2 Type-A 10 Gbps
1
Front USB 3.2 Gen 1 Type-C 5 Gbps
1
Front USB-C PD
15 W
Header USB 2.0
4
Header USB 3.2 Gen 1 Type-A 5 Gbps
2

Networking

Ethernet
1 x Realtek 2.5Gb Ethernet
LAN ports
2
LAN speed
2500 Mbps
Wi-Fi
Not included
Bluetooth
No

Audio

Chipset
Realtek® ALC892/ALC897
Analog jacks
3
Gold-plated jacks
No
Optical S/PDIF
No
Spatial audio
No

Additional information

Memory notes
Supports Un-buffered and Clocked Unbuffered DIMM (CUDIMM). Features DIMM Fit and ASUS Enhanced Memory Profile III (AEMPIII). Non-ECC, un-buffered DDR5 memory supports On-Die ECC function. Supported memory types, data rate, and number of DRAM modules vary depending on the CPU and memory configuration.
Display notes
Graphics specifications may vary between CPU types. VGA resolution support depends on processors' or graphic cards' resolution.
Expansion notes
To ensure compatibility of the device installed, please refer to https://www.asus.com/support/download-center/ for the list of supported peripherals.
M.2_1
5.0 x4 · 2242, 2260, 2280 · CPU
M.2_2
4.0 x4 · 2242, 2260, 2280 · Chipset
RAID
SATA (0, 1, 5, 10)
Storage notes
Intel® Rapid Storage Technology supports SATA RAID 0/1/5/10.
USB notes
The front USB 2.0 ports (USB_E1, USB_E2, USB_E3, and USB_E4) share bandwidth. The front USB Type-C connector supports a maximum power delivery output of 5V/3A.
Audio notes
Realtek 7.1 Surround Sound High Definition Audio CODEC. 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.
Button notes
The motherboard includes a Clear CMOS header.
Fan / RGB headers
1 CPU · — OPT · — AIO · 2 chassis · 2 ARGB · 1 RGB
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.

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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

2 x DIMM slots, max. 128GB, DDR5
Supports up to 8800+MT/s (OC),  Non-ECC, Un-buffered ,Clocked Unbuffered DIMM (CUDIMM)*
Dual channel memory architecture
DIMM Fit
Supports Intel® Extreme Memory Profile (XMP) memory module
ASUS Enhanced Memory Profile III(AEMPIII)
* 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 DisplayPort**
1 x HDMI™ port***  
* Graphics specifications may vary between CPU types. Please refer to www.intel.com for any updates.
** Supports max. 4K@60Hz as specified in DisplayPort 1.4.
***  Supports 4K@60Hz as specified in HDMI 2.1.
**** VGA resolution support depends on processors' or graphic cards' resolution.

Expansion slots

Intel® Core™ Ultra Processors (Series 2)
1 x PCIe 4.0 x16 slot
Intel® B860 Chipset
2 x PCIe 4.0 x1 slots
- To ensure compatibility of the device installed, please refer to https://www.asus.com/support/download-center/ for the list of supported peripherals.

Storage

Total supports 2 x M.2 slots and 4 x SATA 6Gb/s ports*
Intel® Core™ Ultra Processors (Series 2) *
M.2_1 slot (Key M), type 2242/2260/2280 (supports PCIe 5.0 x4 mode)
Intel® B860 Chipset
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
4 x SATA 6Gb/s ports
* Intel® Rapid Storage Technology supports SATA RAID 0/1/5/10.

USB

Rear USB (Total 6 ports)
1 x USB 10Gbps port (1 x Type-A)
2 x USB 5Gbps ports (2 x Type-A)
3 x USB 2.0 ports (3 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.
** USB_E1 port, USB_E2 port, USB_E3 port and USB_E4 port share the bandwidth.

Internal I/O

Fan and Cooling Related
1 x 4-pin CPU Fan header
2 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
2 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
2 x Addressable Gen2 headers
1 x Aura RGB header
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

Rear I/O

1 x USB 10Gbps port (1 x Type-A)
2 x USB 5Gbps ports (2 x Type-A)
3 x USB 2.0 ports (3 x Type-A)
1 x DisplayPort
1 x HDMITM port
1 x Realtek 2.5Gb Ethernet port
3 x Audio jacks
1 x PS/2 Keyboard/Mouse combo port

Audio

Realtek 7.1 Surround Sound High Definition Audio CODEC*
- 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

ASUS 5X PROTECTION III
- DIGI+VRM
- LANGuard
- Overvoltage protection
- SafeSlot Core+
- Stainless-steel back I/O
ASUS Q-Design
- Q-Dashboard
- Q-DIMM
- Q-LED Core
- Q-Slot
ASUS Thermal Solution
- VRM heatsink design
ASUS EZ DIY
- ProCool
Aura Sync
- Aura RGB header
- Addressable Gen2 headers

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