I've got an Antec P180 case with the middle hard drive bay removed. In its place I've 2 Sharkoon 120mm fans one in front of the other. These are pointed at a GTX 480 which is overclocked and subsequently has its fan at a higher speed making it noisier. My question is would it be worth changing one of the Sharkoon fans for an Air Penetrator fan. Plus how what type of noise level do they create? I was thinking that if I replace one of the fans I could have it blowing straight up at the GTX 480's heatsink.