Their hashrates are significantly higher than anything GPUs are capable of. Bitmain released their AntMiner S5 Bitcoin miner in late The sturdy design comes in handy when a miner needs to arrange the multiple miners on one shelf. This limits the placement of the unit and somewhat reduces its safety. For the sake of your future, financial future, it is wise that you start thinking of accumulating Bitcoins. Buy a sufficient amount of cooling fans to keep your hardware working.