I ran unigine heaven on my zotac gtx 1070 amp edition and it makes a electrical hissing noise. It's not the fans because I stopped the fans with my fingers and the noise continued. Someone please tell me what to do
Not sure about hissing but google "coil whine" to see if it's a similar noise. If it is that most modern GPUs make it when they render a lot of frames a second.
It's quite normal but if it's overly loud/distracting some companies will let you RMA them.