Searching for Solution Update. ​So the hissing, kettlelike sound tends to be present in other games too except it is hidden behind fan noise most of the time. The windows 7 seems to be a separate proble on its own as ALL my games stutter massively whilst GPU usage and CPU usage is under 50% WT! Nevermind Windows 7 for now. SKyrim Vanilla without ENB at its original settings but with the hi res DLC works butter smooth at 165hz+ in SLI!! Even at "speedmult 1000" I hardly get any stutter when crossing borders. So we are looking for something that is ENB related anbd perhaps GTX 980 TI related ?!