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Compact black barebone mini PC with no memory or storage installed

ASRock Industrial

ASRock Industrial NUC BOX-255H barebone mini PC, Core Ultra 7 255H

SKU CH-9F5M-HFMEB MPN NUC BOX-255H

Barebone mini PC with Intel Core Ultra 7 255H, dual 2.5Gbps LAN, Wi-Fi 6E, Bluetooth 5.3, dual DDR5 6400 SO-DIMM slots up to 96GB, two M.2 PCIe Gen4x4 SSD slots, Intel Arc graphics, HDMI 2.1.

  • ColorBlack
  • AI FeaturesAI Accelerated
  • CPU TypeIntel Core Ultra 7 255H
  • Memory installedNo Memory
  • Memory slot2 x 262Pin SO-DIMM
  • Memory Type SupportedDDR5 6400

CPU Type Intel Core Ultra 7 255H

Options 2 Ethernet Ports

  • Intel Core Ultra 7 255H processor drives AI-accelerated workloads
  • Dual-channel DDR5 6400 memory support up to 96 GB capacity
  • Two M.2 slots with PCIe Gen4x4 for high-speed SSD storage
  • Dual 2.5 Gbps Intel LAN plus Wi-Fi 6E and Bluetooth 5.3 connectivity
  • Front USB4 Thunderbolt 4 and USB 3.2 Gen2x2 with DisplayPort video output

Compact AI mini PC for custom builds

The ASRock Industrial NUC BOX-255H is a barebone mini PC built around the Intel Core Ultra 7 255H processor with integrated Intel Arc graphics and AI acceleration. It targets builders who want a small footprint for gaming, content creation or edge workloads and prefer to choose their own DDR5 memory and storage.

Straightforward assembly with two memory slots

Installing components means opening the chassis, inserting up to two 262-pin SO-DIMM modules and fitting M.2 drives into the Key M slots. The board supports DDR5 6400 in dual-channel mode up to 96 GB total. No memory or drives are included, so the builder must supply compatible modules and screws for the 2242 and 2280 form factors.

Verify DDR5 SO-DIMM and M.2 Key M compatibility

Before ordering, confirm you have DDR5 6400 SO-DIMMs and M.2 Key M SSDs in 2242 or 2280 lengths. The system provides one SATA 6.0 Gb/s port, two HDMI 2.1 outputs, USB4 with DP 2.1, USB 3.2 Gen2x2 Type-C with DP 1.4a, dual 2.5 Gbps LAN, Wi-Fi 6E and Bluetooth 5.3. Buyers needing pre-installed RAM or a 2.5-inch drive bay should look elsewhere.

Highlights

  • Intel Core Ultra 7 255H processor drives AI-accelerated workloads
  • Dual-channel DDR5 6400 memory support up to 96 GB capacity
  • Two M.2 slots with PCIe Gen4x4 for high-speed SSD storage
  • Dual 2.5 Gbps Intel LAN plus Wi-Fi 6E and Bluetooth 5.3 connectivity
  • Front USB4 Thunderbolt 4 and USB 3.2 Gen2x2 with DisplayPort video output

Specifications

BrandASRock Industrial
ModelNUC BOX-255H
ColorBlack
AI FeaturesAI Accelerated
CPU TypeIntel Core Ultra 7 255H
Memory installedNo Memory
Memory slot2 x 262Pin SO-DIMM
Memory Type SupportedDDR5 6400
Max Memory Supported96GB (48 GB per DIMM)
Dual Channel Memory SupportedYes
Storage InstalledNo Hard Drive
Serial ATA1 x SATA 6.0Gb/s
M.2 Slot1 x M.2 (KEY M, 2242/2280) with PCIe Gen4x4 for SSD
1 x M.2 (KEY M, 2242) with PCIe Gen4x4 for SSD
Integrated GraphicsIntel Arc Graphics
Onboard AudioRealtek ALC256
LANLAN1: Intel I226LM
LAN2: Intel I226V
Max LAN SpeedDual 2.5Gbps
Wireless LAN802.11ax
WiFi GenerationWi-Fi 6E
BluetoothBluetooth 5.3
Front USB1 x USB 3.2 Gen2 (Type A)
1 x USB4/Thunderbolt 4 (Supports DP 2.1 display output)
1 x USB3.2 Gen2x2 (Type-C, Supports DP1.4a display output)
Front Audio Ports1 (headphone & microphone jack)
HDMI2 x HDMI 2.1 TMDS
Rear USB2 x USB 3.2 Gen 2 (Type-A)
RJ452 x 2.5 Gigabit LAN
Input12V~24V DC-In Jack
Power Supply19V/120W
Dimensions4.63" x 4.33" x 1.93"
Weight2.2 lbs.
Packaging1 x 19V/120W Power Adapter (Core Ultra 7)
1 x VESA mount bracket
Shipping weight1.70 kg
Package size241 × 155 × 132 mm

Other versions of this model

2 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

How do I confirm the Intel Arc Graphics are active after installing memory and storage?

Connect a display to an HDMI 2.1 or USB-C port, power on, enter the UEFI to verify the Intel Core Ultra 7 255H is detected, then check Device Manager in Windows for the Arc Graphics driver.

Which parts are missing from the barebone and must be purchased separately?

The unit ships without DDR5 6400 SO-DIMMs and without any M.2 or SATA drive; you must add up to 96 GB of memory and at least one SSD for the operating system.

Should I choose 48 GB or 96 GB total memory for the dual-channel 262-pin slots?

Both capacities run at DDR5 6400 in dual-channel; 48 GB (2 × 24 GB) covers most workloads, while 96 GB (2 × 48 GB) is only needed for heavy multitasking or local AI tasks.

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