kunwho :
They should design that the CPU is mounted on underside of the motherboard and the fan as a motherboard tray.
What the ... how would that work?!
1. How would you mount the motherboard onto a fan? Yes, you could probably put certain standoff holes in the fan case but it would be way too flimsy to support a motherboard and all the components.
2. The motherboard would block the airflow. It's basically like having a normal desk fan and holding a large piece of cardboard directly in front of it. Useless.