My dad has decided that the stock fan on his quad core amd cpu resembles the weed eater too much and wants to replace it with a quieter aftermarket fan. Problem is his tower is small ( https://www.newegg.com/Product/Product.aspx?Item=N82E16811133186&cm_re=Thermaltake_VM600M1W2Z_Dokker_Tower-_-11-133-186-_-Product ) and it doesn't look like there is a lot of clearance for a large sized fan setup so I figured I ask the community and see if I could get some recommendations from the pro's.