ASUS Prime B860M-K
ASUS Prime B860M-K Specifications Review
ASUS Prime B860M-K by ASUS is a Micro-ATX form factor motherboard based on the mid-range B860M chipset and LGA 1851 socket, providing a balanced set of features and connectivity. It is designed to support DDR5 memory, with 2 slots, a maximum capacity of 128 GB, and an overclocking speed of up to 8800 MHz.
VRM Quality
The ASUS Prime B860M-K has a basic VRM configuration, delivering 55 A across 6 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 B860M-K 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 1 x16 slot , and 2 x1 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 2 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 has essential connectivity features with wired 1 x Realtek 2.5Gb Ethernet Ethernet . USB connectivity covers basic needs. Please refer to the specification table for details.
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 B860M-K is basic and functional, carrying an overall quality score of 46.20. It is designed for budget-conscious builds or office setups where advanced features are not required, handling standard tasks effectively but lacking the polish or expandability of higher-tier models.
This motherboard shows a % value score indicating less favorable price-to-performance compared to mainstream models. For budget-conscious buyers, there may be better value options available at this price point.
General Information
| Manufacturer | ASUS |
|---|---|
| Motherboard Name | ASUS Prime B860M-K |
| Current Price Amazon | $0 |
| Amazon Price Updated | No price update history available. |
| Motherboard Available | False |
| Chipset / Socket | B860M / LGA 1851 |
| Form Factor | Micro-ATX |
VRM Configuration
| CPU Power Phases (Amps) | 6 (55 A) |
|---|---|
| Power Design | 6+1+1+1 |
Memory Information
| Type / Slots | DDR5 / 2 slots |
|---|---|
| Max Capacity / Max OC | 128 GB / 8800 MHz |
PCIe Slot Configuration
| Supported Version | PCIe 4.0 | ||||
|---|---|---|---|---|---|
| Slot Size | Physical Slots | Gen4 |
|---|---|---|
| x16 | 1 | 1 |
| x1 | 2 | 2 |
Storage Configuration
| M.2 Slot Count | 2 slots |
|---|---|
| M.2 Supported Lengths | 2242, 2260, 2280 |
| SATA Ports | 4 |
Onboard Audio Features
| Audio Chipset | Realtek® ALC892/ALC897 |
|---|---|
| Analog Audio Jacks | 3 jacks |
Motherboard Display Outputs
| HDMI Output | HDMI - Version 2.1 (Max: 4K@60Hz) |
|---|---|
| DisplayPort Output | DisplayPort - Version 1.4 (Max: 4K@60Hz) |
USB and Thunderbolt Connectivity
Rear USB Ports
| USB 2.0 Type-A (480 Mbps) | 3 |
|---|---|
| USB 3.2 Gen 1 Type-A (5 Gbps) | 2 |
| USB 3.2 Gen 2 Type-A (10 Gbps) | 1 |
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: 1 x Realtek 2.5Gb Ethernet LAN Ports: 2 |
|---|---|
| Wi-Fi |
Module: Not Included |
| Bluetooth | Supported: No |
Button Features
| Buttons |
|---|
Quality & Features
Additional Information
| RAM | 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 | Graphics specifications may vary between CPU types. VGA resolution support depends on processors' or graphic cards' resolution. |
| Expansion | To ensure compatibility of the device installed, please refer to https://www.asus.com/support/download-center/ for the list of supported peripherals. |
| Storage |
M.2 Slot Details:
Intel® Rapid Storage Technology supports SATA RAID 0/1/5/10. |
| 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. |
| Buttons | The motherboard includes a Clear CMOS header. |
| 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 B860M-K 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) |
|---|---|---|---|---|---|---|---|---|
|
$150
|
0.0%
|
54.2%
|
20.0%
|
68.0%
|
88.0%
|
50.0%
|
45.0%
|
68.7%
|
|
|
$161
|
0.0%
|
53.0%
|
32.0%
|
67.0%
|
78.0%
|
43.0%
|
45.0%
|
62.6%
|
|
|
$173
|
0.0%
|
52.2%
|
24.0%
|
87.0%
|
81.0%
|
29.0%
|
40.0%
|
57.3%
|
|
|
$230
|
0.0%
|
51.6%
|
31.0%
|
73.0%
|
48.0%
|
63.0%
|
43.0%
|
42.6%
|
|
|
$160❗
|
0.0%
|
49.6%
|
24.0%
|
62.0%
|
53.0%
|
69.0%
|
40.0%
|
58.9%
|
|
|
$0
|
0.0%
|
46.2%
|
17.0%
|
67.0%
|
60.0%
|
42.0%
|
45.0%
|
N/A | |
|
$120
|
0.0%
|
40.4%
|
14.0%
|
62.0%
|
54.0%
|
32.0%
|
40.0%
|
64.0%
|
|
|
$204❗
|
↓
-8.1%
|
38.4%
|
17.0%
|
10.0%
|
80.0%
|
45.0%
|
40.0%
|
35.8%
|
Motherboard Comparison and Detail Specifications Table
| Specification |
No image available |
Perf Chart | ||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Price |
$150
|
0.0%
|
$161
|
0.0%
|
$173
|
0.0%
|
$230
|
0.0%
|
$160❗
|
0.0%
|
$0
|
0.0%
|
$120
|
0.0%
|
$204❗
|
↓
-8.1%
|
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| Manufacturer | GIGABYTE | ASUS | GIGABYTE | GIGABYTE | ASRock | ASUS | ASRock | ASUS | ||||||||||||||||||||||||||||||||||
| Chip/Socket | B860M / LGA 1851 | B860 / LGA 1851 | Z890M / LGA 1851 | B860I / LGA 1851 | B860I / LGA 1851 | B860M / LGA 1851 | B860M / LGA 1851 | Q870M / LGA 1851 | ||||||||||||||||||||||||||||||||||
| Form | Micro-ATX | Standard-ATX | Micro-ATX | Mini-ITX | Mini-ITX | Micro-ATX | Micro-ATX | Micro-ATX | ||||||||||||||||||||||||||||||||||
| CPU Phases | 8 (50 A) | 8 (80 A) | 8 (60 A) | 8 (80 A) | 8 (60 A) | 6 (55 A) | 5 (60 A) | 6 (55 A) | ||||||||||||||||||||||||||||||||||
| PWR Design | 8+1+2 | 8+1+1 | 8+1+2 | 8+1+2 | 8+1+1+1+1 | 6+1+1+1 | 5+1+1+1+1 | 6+1+1+1 | ||||||||||||||||||||||||||||||||||
| Mem Slots | 4 / DDR5 | 4 / DDR5 | 4 / DDR5 | 2 / DDR5 | 2 / DDR5 | 2 / DDR5 | 2 / DDR5 | 4 / DDR5 | ||||||||||||||||||||||||||||||||||
| Max Mem | 256 GB / 9066 MHz | 256 GB / 8666 MHz | 256 GB / 9066 MHz | 128 GB / 9200 MHz | 128 GB / 8933 MHz | 128 GB / 8800 MHz | 128 GB / 8333 MHz | 256 GB / 6400 MHz | ||||||||||||||||||||||||||||||||||
| PCIe | PCIe 5.0 | PCIe 5.0 | PCIe 5.0 | PCIe 5.0 | PCIe 5.0 | PCIe 4.0 | PCIe 4.0 | PCIe 5.0 | ||||||||||||||||||||||||||||||||||
| PCIe Slots | 1x16 Gen5 | 2x16 Gen4 | 1x16 Gen5 | 1x16 Gen4 | 1x16 Gen5 | 1x16 Gen4 | 1x16 Gen5 | 1x16 Gen5 | 1x16 Gen4 | 2x1 Gen4 | 1x16 Gen4 | 2x1 Gen4 | 1x16 Gen5 | 1x16 Gen4 | 1x1 Gen4 | ||||||||||||||||||||||||||||||||||
| M.2 | 2 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | ||||||||||||||||||||||||||||||||||
| SATA | 4 | 4 | 4 | 2 | 4 | 4 | 4 | 4 | ||||||||||||||||||||||||||||||||||
| Audio | Realtek® ALC892/ALC897 | Realtek® ALC892/ALC897 | Realtek® Audio CODEC | Realtek® Audio CODEC | Realtek ALC897 Audio Codec | Realtek® ALC892/ALC897 | Realtek ALC897 Audio Codec | Realtek 7.1 Surround Sound Hi… | ||||||||||||||||||||||||||||||||||
| S/PDIF | ❌ | ❌ | ❌ | ✔️ | ❌ | ❌ | ❌ | ❌ | ||||||||||||||||||||||||||||||||||
| HDMI | ✔️ (2.1) | ✔️ (2.1) | ✔️ (2.1) | ✔️ (2.1) | ✔️ (2.1) | ✔️ (2.1) | ✔️ (2.1) | ✔️ (2.1) | ||||||||||||||||||||||||||||||||||
| DP | ✔️ (2.1) | ✔️ (1.4) | ✔️ (2.1) | ✔️ (2.1) | ✔️ (1.4) | ✔️ (1.4) | ❌ | ✔️ (1.4) | ||||||||||||||||||||||||||||||||||
| LAN | Realtek® 2.5GbE LAN chip… (1 ports) | 1 x Realtek 2.5Gb Ethern… (1 ports) | Realtek® 2.5GbE LAN chip… (1 ports) | Realtek® 2.5GbE LAN chip… (1 ports) | 1 x 2.5 Gigabit LAN 10/1… (2 ports) | 1 x Realtek 2.5Gb Ethern… (2 ports) | - Gigabit LAN 10/100/100… (1 ports) | 1 x Intel® I219LM 1Gb Et… (2 ports) | ||||||||||||||||||||||||||||||||||
| Wi-Fi | Wi-Fi 6E | ❌ | ❌ | Wi-Fi 7 | Wi-Fi Wi-Fi 6E | ❌ | ❌ | ❌ | ||||||||||||||||||||||||||||||||||
| BT | v5.3 | ❌ | ❌ | v5.4 | v5.3 | ❌ | ❌ | ❌ | Rear 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 |
|---|---|---|---|---|---|---|---|---|---|
| No compatible CPU available. The motherboard's VRM is too weak to be recommended with any CPU in the database. | |||||||||
Official Manufacturer Data
Memory:
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 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.
Storage:
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.
Expansion Slots:
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.
USB:
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:
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
Back Panel I/O:
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:
- 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-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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