This Antminer G2 Ethereum GPU Miner is a BITMAIN customized product that supports multi-currency mining including ETH, Zcash, XMR and so on. It hits a speed of 220MH for ETH mining with EIGHT AMD Radeon RX570 video cards which makes it undoubtedly a pioneer machine in the field.
Evaluation on BITMAIN's GPU Miner Antminer G2: https://www.eastshoremining.com/evaluation-on-bitmains-gpu-miner-antminer-g2/