Despite the processing power, C69xx PCs are small, measuring 2.6x9.1x4.6 inches in the largest housing configuration. Assembled with thick plating, the PC housings are still built to last. The basic configuration features a flash disk as the boot and memory medium, providing a solid state PC with no moving parts. The C6925 with 1 GHz Intel Celeron M ULV processor is a fanless model. The C6920 offers a choice of a 1.5GHz Intel Celeron M or 1.8GHz Intel Pentium M processor, and has an easy-to-service fan tray on the underside of the case. All C69xx PCs are rated for operation at ambient temperatures up to 131ºF (55ºC). The C69xx PC’s flash disk (up to 8GB), optional hard drive measuring just 2 1/2 inches and the CMOS battery are easily accessible behind a front cover.