GMKtec

GMKtec NucBox K6 (Ryzen 7 7840HS)

Name: GMKtec NucBox K6 (Ryzen 7 7840HS)
Brand: GMKtec

The NucBox K6 is a 128.8 x 127 x 47.8 mm mini PC with AMD's Ryzen 7 7840HS: 8 Zen 4 cores, Radeon 780M graphics and a 65 W TDP. It takes two DDR5-5600 SO-DIMMs (up to 64 GB) and two PCIe 4.0 NVMe SSDs. Unusually for a gaming-class mini, it has two 2.5 GbE ports, so it can work as a Proxmox host with separate management and VM networks, or as a fast router. There is one USB4 port, but GMKtec rates it at 20 Gbps rather than the full 40 Gbps, which matters if you plan to use an external GPU or fast storage enclosure. The 780M handles 1080p gaming at modest settings and hardware video decoding. Power comes from a 120 W 19 V brick.

Good for

Badges come from the spec rules on each use page, not from guesswork.

Specs that matter used

CPU generation: AMD Ryzen 7040 / 8040 (Phoenix / Hawk Point)
CPU options: Ryzen 7 7840HS
Form factor: Consumer mini PC
Memory: DDR5-5600 SO-DIMM, 2 slots
Max RAM (official): 64 GB
Storage: 2x M.2 2280 PCIe 4.0 NVMe; SATA M.2 SSDs not supported; no 2.5-inch bay. GMKtec lists 4 TB total as the maximum.
Ethernet: 2 × 2.5 GbE (Dual 2.5 GbE (controller not named by GMKtec))
Wi-Fi: Wi-Fi 6 + BT 5.2 (AMD RZ616 / MediaTek)
vPro / AMT: No
Cooling: Fan-cooled
Power adapter: 19 V / 6.32 A (120 W) DC brick
Windows 11: CPU generation is on Microsoft's supported list

Spec sources

https://www.gmktec.com/products/amd-ryzen-7-7840hs-mini-pc-nucbox-k6

Check before you buy

The USB4 port is rated 20 Gbps by GMKtec, not 40 Gbps; don't count on full-speed eGPU or Thunderbolt enclosure performance.
Only NVMe drives work in the M.2 slots; SATA M.2 SSDs are not supported.
Make sure the 120 W (19 V / 6.32 A) adapter comes with it; a lower-wattage brick may not power the 7840HS under load.
GMKtec sold barebone units, so confirm what RAM and SSD are installed.

General off-lease checks (BIOS passwords, Computrace, missing drive caddies) are in the used mini PC buying checklist.

On eBay

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Search eBay for “GMKtec K6 7840HS”. 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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Specs that matter used

Check before you buy

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