NF2 5 Gh/s Nano Fury 2 Dual Chip USB Miner Bitfury NFY2 asic-miner The New NF2 miner contains TWO Bitfury (Rev.1) ASIC Chips Sturdy construction includes Black heat sink on the back, to Disperse Heat. Super Easy Install - No additional drivers needed! Bfgminer & Cgminer support! Speed per bits: 50 bits  3.7-4.1 Gh/s, 53-55 bits  4.7-5.4 Gh/s.!!5Gh/s In one USB miner!! Easy&Simple to Over/Under-Clock By only adjusting Oscillator bits, No Pencil Mod!!