Almost a full PC
These built-up matchbox systems offer a little more breathing room.
Clockwise from top left: The Trim-Slice H packs not only an ARM Cortex-A9 processor and an NVIDIA Tegra 2 chipset but a 2.5 SATA hard disk into a fanless case. Prices start at $279, with developer kits available at $175.
The folks at Cappuccino PC build full-blown Intel systems (Atom or Core, your choice); the fanless SlimPro SP675FP, shown here, measures 10 in. on its longest side and sells for $685.
CompuLab's fit-PC3, which starts at $275 with minimal configuration, uses a dual-core 64-bit AMD processor with a 2.5-in. hard disk and a Radeon HD 6250 or 6320 GPU.