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Dark green Micro-ATX board with silver heatsinks, four DDR5 slots and a metal-reinforced PCIe slot

ASRock

ASRock B860M Pro RS Intel motherboard LGA 1851

SKU CH-MXXS-EECKH MPN B860M Pro RS

Micro-ATX board for Intel Core Ultra Series 2 CPUs, four DDR5 slots up to 8666 MT/s, PCIe 5.0 x16, one Gen5 M.2, two Gen4 M.2, four SATA, Realtek 7.1 audio and Dragon RTL8125BG LAN

  • ProcessorIntel Core Ultra Processors (Series 2)
  • ChipsetIntel B860
  • Form factorMicro ATX
  • CPU socketLGA 1851
  • Memory slot count4 × 288pin (DDR5)
  • Supported memoryUp to DDR5 8666+(OC)

Model B860M Pro RS

  • Supports Intel Core Ultra Series 2 processors on LGA 1851 socket
  • 10+1+1+1+1 Dr.MOS power phases deliver stable CPU current
  • Four DDR5 slots up to 8666+(OC) with XMP 3.0 support
  • PCIe 5.0 x16 and M.2 Gen5x4 128 Gb/s for fastest graphics and storage
  • 1 channel Realtek ALC897 audio with Nahimic enhancement

Socket and processor support

The board uses the LGA 1851 socket for Intel Core Ultra Series 2 processors. The Intel B860 chipset provides the platform foundation. Four DDR5 slots accept up to 256 GB in dual-channel mode.

Memory capacity and speed limits

Memory runs up to 8666 MT/s with XMP 3.0 profiles on non-ECC unbuffered DIMMs. The 256 GB ceiling is reached only when all four slots are populated with high-density modules. Two slots leave headroom for later expansion.

Expansion slots and onboard audio

One PCIe 5.0 x16 slot and one PCIe 4.0 x4 slot handle graphics and add-in cards. Three M.2 sockets support 2280 drives, with the top slot wired for Gen5 x4 speeds. Realtek ALC897 delivers 7.1-channel audio with Nahimic software.

How it compares

Measured against everything we stock in Motherboards for Intel CPUs, at today’s prices. Recalculated every night.

Price $116.99
Pricier than about 60% of the 2,965 comparable items (median $97.99).

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Specifications

Product
Brand nameASRock
Model nameB860M Pro RS
Part numberB860M Pro RS
Processor
ProcessorIntel Core Ultra Processors (Series 2)
CPU socketLGA 1851
ChipsetIntel B860
Memory
Memory slot count4 × 288pin (DDR5)
Supported memoryUp to DDR5 8666+(OC)
Max supported RAM256 GB
Memory channelsDual Channel
Memory profilesIntel XMP 3.0
Storage
SATA ports4 x SATA 6Gb/s
M.2 slotsCPU:
- 1 x Blazing M.2 Socket (M2_1, Key M), supports type 2280 PCIe Gen5 × 4 (128 Gb/s) mode*
Chipset:
- 1 x Hyper M.2 Socket (M2_2, Key M), supports type 2230/2242/2260/2280 PCIe Gen4 × 4 (64 Gb/s) mode*
- 1 x Hyper M.2 Socket (M2_3, Key M), supports type 2280 PCIe Gen4 × 4 (64 Gb/s) mode*
* Supports Intel Volume Management Device (VMD)
Supports NVMe SSD as boot disks
SATA and RAID supportSupports RAID 0, RAID 1, RAID 5 and RAID 10 for SATA storage devices
Audio & video
Audio chipRealtek ALC897
Sound channels7.1 CH HD Audio with Content Protection
Connectivity
Ethernet controllerDragon RTL8125BG
Maximum network speed2.5 Gbit/s
Ports & slots
PCIe 5.0 x16 slotsCPU:
- 1 x PCIe 5.0 x16 Slot (PCIE1), supports x16 mode*
PCIe x4 slotsChipset:
- 1 x PCIe 4.0 x4 Slot (PCIE2), supports x4 mode*
Rear panel ports2 x Antenna Mounting Points
1 x HDMI Port
1 x DisplayPort 1.4
1 x USB 3.2 Gen2 × 2 Type-C Port (20 Gb/s)
3 x USB 3.2 Gen1 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
Onboard USB headers2 x USB 2.0 Headers (Support 4 USB 2.0 ports)
2 x USB 3.2 Gen1 Headers (Support 4 USB 3.2 Gen1 ports)
1 x Front Panel Type C USB 3.2 Gen1 Header
Power
Power connectors1 × 24 pin ATX Power Connector
1 × 8 pin 12 V Power Connector (Hi-Density Power Connector)
1 × 4 pin 12 V Power Connector (Hi-Density Power Connector)
Size & build
Form factorMicro ATX
Width and length9.6 in × 9.6 in
Shipping weight2.20 kg
Package size310 × 280 × 70 mm
Compatibility
Windows 11 support64-bit
In the box
In the box2 x SATA Data Cables
1 x Screw for M.2 Socket
More details
BIOS256Mb AMI UEFI Legal BIOS with GUI support

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Questions about this item

Can I keep my DDR5 memory kit when upgrading to this B860M Pro RS?

The board has four 288-pin DDR5 slots supporting dual-channel operation up to 8666+(OC) with Intel XMP 3.0 and CUDIMM support, maximum capacity 256GB.

How can I verify the board is running correctly after first boot?

POST codes on the debug display and the Nahimic audio splash confirm CPU, memory and Realtek ALC897 7.1 audio initialisation; Dragon RTL8125BG LAN link lights show network readiness.

Which cables and modules ship with the motherboard and what must I source separately?

Box includes the Micro-ATX board, I/O shield, SATA cables, M.2 screws and documentation; DDR5 DIMMs, CPU, GPU, NVMe SSDs and Wi-Fi module for the Key-E slot are purchased separately.

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