running out the warranty, you have already burned two cards, to be noted that I never overclokkato the miner, indeed, here in Sicily we 37gradi ° C, quindo I brought miner frequency 550, and you will burn too, just are tired of spending money, meteriali too poor, the power supplies are to bitmain, so the problem is always and only the bad material, then this miner and done badly, the blade that suffers most is the central one, when turned off the central one other blades down temperature, from 66 down to 58C °,