GMKtec
GMKtec NucBox K9 (Core Ultra 5 125H)
The NucBox K9 is GMKtec's Intel Meteor Lake mini PC, built around the Core Ultra 5 125H (14 cores, 18 threads, Arc integrated graphics and an NPU) in a 128.8 x 127 x 47.8 mm case. It takes two DDR5-5600 SO-DIMMs up to 96 GB and two M.2 2280 slots that accept NVMe or SATA SSDs. It has two Realtek 2.5 GbE ports and one full-function USB4/Thunderbolt 4 Type-C port with video output and power input. Intel's Quick Sync media engine makes it a strong Plex or Jellyfin transcoding box, and the core count and RAM ceiling suit Proxmox.
Good for
- AI agent server
- Local LLM
- Home Assistant
- n8n / automation
- Proxmox homelab
- Frigate NVR
- Plex / Jellyfin
- Network services
Badges come from the spec rules on each use page, not from guesswork.
Specs that matter used
- CPU generation
- Intel Core Ultra Series 1 (Meteor Lake)
- CPU options
- Core Ultra 5 125H
- Form factor
- Consumer mini PC
- Memory
- DDR5-5600 SO-DIMM, 2 slots
- Max RAM (official)
- 96 GB
- Storage
- 2x M.2 2280 slots supporting PCIe 3.0/4.0 NVMe and SATA; no 2.5-inch bay; GMKtec lists 4 TB total
- Ethernet
- 2 × 2.5 GbE (Dual Realtek 2.5 GbE)
- Wi-Fi
- Wi-Fi 6 (Intel AX201) + Bluetooth 5.2
- vPro / AMT
- No
- Cooling
- Fan-cooled
- Power adapter
- 19 V / 6.32 A (120 W) DC brick, 5.5 x 2.5 mm barrel; the USB4/TB4 port also accepts PD power input
- Windows 11
- CPU generation is on Microsoft's supported list
Check before you buy
- Confirm the CPU is the Core Ultra 5 125H; GMKtec's K9 page lists no other CPU option, so a different chip may mean a mislabeled listing.
- There is one USB4/Thunderbolt 4 port. If you need two high-speed Type-C ports, look elsewhere.
- The Ethernet ports are Realtek, not Intel; if you plan to run a hypervisor, check its NIC support first.
- Check that the 120 W 19 V adapter is included; the Type-C port can take PD power, but a low-wattage charger may limit performance.
General off-lease checks (BIOS passwords, Computrace, missing drive caddies) are in the used mini PC buying checklist.
On eBay
Find a GMKtec NucBox K9 (Core Ultra 5 125H)
Search eBay for “GMKtec K9 125H”. Off-lease units are listed in batches, often with the RAM, drive and power adapter in the title, so compare those before price. Use the checks on this page before you buy.
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