Some additionally information:

Package: QFN-48

Low Power : 1 GH/s at 0.8 V with 1.5 W per GH/s.
Typical: 1.2 - 1.4 GH/s at standard 0.9 V, with 2.05 W per GH/s.
Turbo: 1.5-1.6 GH/s at 1.0 V with 2.5 W per GH/s.

Datasheet: http://downloads.canaan-creative.com/hardware/A3255/datasheet/A3255Q48-131113-V05-EN.pdf