Antminer C1.
I really hope Bitmain design a new C2 with the S5 chip.
4x S5 chip would be quite nice
Yes, since S5 PCB is single side heat it can be fanless 3TH/s machine with 4 blades and decent factory OC. Very quiet and strong.
Bitmain unfortunatelly is not planning C1 with S5 chips. It is e-mail response from Bitmain to me.