Under 1w/gh. Not bad. Not bad at all!
Actually, it's quite horrible. It's not even close to what was promised.
Prospero X-1 will scan 100Ghash while using less than 55 Watts and Prospero X-3 will be able to scan an outstanding 2000Ghash while using less than 1050 Watt.
That was our first design before the delay. This design was expected at 0.75Watt/Ghash. The chip can still be fine tuned to get a better efficiency.