The fans in my PC are getting to a notably loud level in my PC so I want to work out what my best course of action would be. The CPU fan is pretty quiet so I'm quite content with that. The same goes for the PSU. Graphics, however, are the most audible, as are the whopping great fans at the bottom of the case. I could crank up the bottom fans to decrease the fan speed of the graphics but then I'd end up with an overall louder case. So, is it worthwhile replacing the case fans and what would be my best course of action for the graphics cards? Card 1 sits around 50 degrees Celsius idle, card 2 at around 40.