Compulab’s Airtop is a compact 7.5-liter desktop system that can dissipate up to 200W of heat using only passive cooling methods. The Airtop utilizes various industry-standard components and can be configured as a gaming PC, a server or a workstation. The system is based on a proprietary motherboard featuring Intel’s C226 platform controller hub (PCH) designed specifically for the Airtop with NAF cooling. The mainboard places CPU socket, DIMM slots, PCI Express x16 slot and other components in a way to enable the most efficient dissipation of heat. To eliminate hot components from the case, the Airtop uses an external PSU with a mini-DIN connector.
http://www.anandtech.com/show/9958/compulab-rollsout-passivelycooled-airtop-systems