DAC transcievers are always hotter than a fiber ones, easily tested by handling them (for a comparable speeds) in one chassis. And on the minor note - external

DAC transcievers are always hotter than a fiber ones, easily tested by handling them (for a comparable speeds) in one chassis. And on the minor note - external SAS connectors (6/12gbps) are more then just warm, too. My own experience, YMMW.