Obelisk sc1 immersion that is capable of producing hashrate of 2.2Th/s . Obelisk sc1 immersion is specially design to mine siacoin with greater efficiency and power and is among the most profitable miner till now. It is great miner i have ordered my previous order was received to fast.
https://estrahash.com/product/buy-obelisk-sc1-immersion-price-siacoin-miner-with-power-supply-psu/