The PSU fan pulls air in (through the ventilated side panel) and expels it up-and-out, creating the usual closed-circuit cooling pathway for a PSU. The video card is cooled by breathing air from a 120mm side panel intake fan – pulling through the same ventilated side panel as the PSU – and then uses its normal cooling design to dissipate heat. A blower fan might actually make decent sense in this kind of configuration, as it'd push air up-and-out of the enclosure.
Because only a video card needs to be powered, a 450W PSU will be ample for any presently existing single-GPU solution on the market.
Immediate competitors include the Razer Core, ASUS XG Station 2, and the forthcoming PowerColor DevilBox.
Editorial: Steve “Lelldorianx” Burke
Video: Keegan “HornetSting” Gallick