What Is a Small Desktop PC?
A small desktop PC — often called a mini PC or compact desktop — is a fully functional computer built into a chassis measured in centimetres rather than the litres of space a conventional tower occupies. Most models in this class fit in the palm of a hand, weigh under a kilogram, and mount behind a monitor with a standard VESA bracket so that the desk stays completely clear. The defining trade-off is simple: you give up internal expansion slots and full-size graphics cards, and in return you get a machine that sips power, runs silently, and can be tucked away almost anywhere.
The query "デスクトップ 小" (small desktop) is really a question about size, and size in this segment is driven by three engineering choices: the processor's thermal design power (TDP), the cooling method, and the storage form factor. Low-power Intel processors such as the Celeron J4125 (10 W) or the Intel N100 / N150 (6 W) generate so little heat that a fanless aluminium heatsink case can cool them passively. More capable chips like the Intel Core i3-1215U (6 cores, up to 4.4 GHz, 10 MB cache, 15 W base) need a slightly larger enclosure but still fit comfortably inside an industrial-grade metal chassis. Storage shrinks too — M.2 NVMe or SATA SSDs in 128 GB, 256 GB, 512 GB or 1024 GB capacities replace 3.5-inch hard drives entirely.
Key Specifications to Check
| Specification | Typical small desktop range | Why it matters |
|---|---|---|
| Form factor volume | 0.3 – 2 litres | Desk space, VESA mounting |
| Cooling | Fanless (passive) or single low-RPM fan | Dust ingress, noise, MTBF |
| Processor |
