GMK has officially begun shipping the NucBox K15 mini PC, a new compact desktop built around Intel’s Core Ultra 5 125U processor. Prices start at $360, and the system uses the same overall chassis design as the company’s NucBox K12. What makes the K15 stand out, though, is that it’s noticeably larger than many other mini PCs that use a similar U-series CPU.
In a market where “smaller is better” often drives buying decisions, the NucBox K15 takes a different route. Compared with slim alternatives like the NucBox M5, this model is about 1.32 times larger and roughly 75% heavier. On paper, that extra size might seem like a drawback—until you look at what GMK is doing with the additional internal space.
Instead of being wasted volume, the bigger chassis allows for features that are often missing from ultra-compact mini PCs. The NucBox K15 includes integrated OcuLink, which can be especially appealing for users who want faster external expansion options. It also supports up to three internal SSDs, giving it a major storage advantage for anyone building a small workstation, media library system, or home lab device. Another practical benefit is removable (upgradeable) RAM, something buyers often have to sacrifice when choosing the smallest mini PC designs.
The larger enclosure also creates room for a less cramped cooling setup. That translates into quieter operation during everyday use, since the system doesn’t have to rely on an overly dense thermal solution or aggressively spinning fans to keep temperatures under control. For office work, study setups, or living-room PCs where noise can be distracting, that quieter runtime can be a real quality-of-life improvement.
That said, there’s still one area where the design could be cleaner. Even though the K15 is larger than many competing mini PCs, it still depends on an external power brick. If your goal is a neat desk or minimal cable clutter, a bulky adapter can be inconvenient and harder to hide. Some similarly sized mini PCs in the wider market have already moved to integrated power supplies, which helps keep setups looking more streamlined.
Overall, the GMK NucBox K15 positions itself as a mini PC that prioritizes expandability, upgrade flexibility, and quieter noise levels over chasing the smallest possible footprint. For shoppers comparing mini PCs with Intel Core Ultra U-series processors, the K15 is a reminder that a slightly bigger box can deliver meaningful everyday benefits—especially if you care about storage options, upgradable memory, and a calmer acoustic profile.
