What it is

The GMKtec NucBox K6 is a sub-1-liter mini PC built around AMD’s Ryzen 7 7840HS — an 8-core, 16-thread Zen 4 chip with the integrated Radeon 780M GPU. At 128.8 × 127 × 51.8 mm and 516 grams, it is one of the smaller Zen 4 mini PCs on the market, and at street prices that often slide below $400 with 32 GB / 1 TB on board, it is also one of the cheapest.

The K6 was GMKtec’s mainstream answer to the Beelink SER7 and Geekom A8 in the price band where most mini PC buyers actually shop. Two years on, the formula still holds: a known-good chip, a NUC-sized chassis, and a price that consistently undercuts the brand-name competition.

What it’s good for

Home and office work. The 7840HS keeps a typical productivity load — Office, Teams, twenty browser tabs, a video call — comfortable. With 32 GB of DDR5-5600 and dual 2.5 GbE, the K6 makes a perfectly credible main desk PC for anyone who wants their machine to disappear behind a monitor stand.

1080p gaming. The Radeon 780M with the 7840HS is the best-tested integrated GPU on the market: NotebookCheck and DroiX recorded CS:GO at 1080p/High around 110 fps, GTA V at 1080p/Medium around 65 fps, and FSR-friendly AAA titles in the 40-60 fps range at 1080p Medium. Independent benchmarks place the 780M roughly 30-50% ahead of Intel’s Arc iGPUs at the same TDP. It is not a 4K gaming machine; it is, surprisingly, a perfectly adequate 1080p one.

Light creator workflows. Lightroom, Photoshop, Premiere at 1080p, DaVinci Resolve for non-color-graded work — all in scope. 4K editing is feasible but slow.

The K6 does not have a dedicated NPU, which makes it less interesting than the newer 8845HS-based K8 Plus for “Copilot+“-class on-device AI work. If on-device AI matters, look at the K8 Plus or one of GMKtec’s EVO models.

Build and connectivity

The K6 chassis is mostly plastic with metal accents — a step down from the full-aluminum builds of the Geekom A8 Max or the K8 Plus. Reviewers note this candidly; for $400, it does not pretend to be a premium build, but it does not feel cheap in hand either. Cooling is a single-fan design that stays quiet at idle and audible at sustained load.

Port layout is sensible:

  • Front: USB-A 3.2 Gen 2, USB-C (data + DP), 3.5 mm combo jack
  • Rear: USB-A 3.2 Gen 2 ×2, USB-A 2.0, USB4 Type-C (40 Gbps, full-feature with PD + DP), HDMI 2.0, DisplayPort, 2× 2.5 GbE, DC jack
  • Display: up to three 4K/8K outputs across HDMI, DP, USB4, and the front USB-C
  • Wireless: Wi-Fi 6E + Bluetooth 5.2

The dual-LAN setup is a meaningful inclusion at this price — useful for small home labs, software-defined router VMs, or simply isolating a work and home network on one box.

Memory, storage, and upgrades

Out of the box: 32 GB DDR5-5600 (2 × 16 GB SODIMM) and a 1 TB PCIe 4.0 NVMe SSD. Both are upgradable. The board accepts up to 64 GB of DDR5 across two SODIMM slots, and there is a second M.2 slot for SSD expansion. GMKtec rates total storage up to 4 TB across both slots in their official documentation.

This is one of the practical advantages of the K6 over the soldered-RAM crowd in the same price band. At $400 you are buying a machine you can actually grow.

Pricing and where to buy

As of April 2026, Amazon lists the 32 GB / 1 TB Ryzen 7 7840HS configuration in the $369-$469 range, with sale pricing dipping under $370 around major shopping events. The 16 GB / 512 GB SKU sits closer to $309, and the bare-bones (no RAM/SSD/OS) variant sells for around $269.

GMKtec’s own store sells the same SKUs at a small premium, with their one-year warranty applying through both retail channels. AliExpress configurations occasionally land lower still (Notebookcheck has tracked the 32 GB / 1 TB variant at $359), but the warranty path is harder to navigate from outside Asia.

What we’d flag

This is a positive review, but a fair one — the K6 has clear trade-offs.

  • No NPU. The 7840HS predates AMD’s XDNA neural engine. If you specifically want a “Copilot+“-style AI PC, the K6 is the wrong machine; consider the K8 Plus or the EVO-X1.
  • HDMI 2.0, not 2.1. Multi-display 4K/120 over HDMI is not on the menu. DisplayPort and USB4 cover the gap.
  • Plastic-heavy chassis. Functional, but not premium.
  • One-year warranty. Beelink and Geekom both offer longer coverage on comparable hardware.
  • Older platform. The 7840HS is a 2023-era chip. It is still excellent — but 2026 reviewers correctly note that 8845HS systems exist at similar street prices.

Verdict

The GMKtec NucBox K6 is a sensible, unfussy budget Zen 4 mini PC. Ryzen 7 7840HS, 32 GB of DDR5, the Radeon 780M, USB4, dual 2.5 GbE, and a price that lands consistently under $400 — that is a strong package for an everyday home or office machine.

If you do not need an NPU, do not need HDMI 2.1, and can live with a one-year warranty and a plastic-trimmed chassis, the K6 remains one of the easiest mini PCs in the market to recommend. If any of those caveats matter, the K8 Plus is a small step up worth considering.