Yea, those fans are the worst idea ever. They already run at 5000Rpm+, don't hardly make any noise, and they tend to die really easy. I would try looking at getting a larger heatsink and just scrapping the fan altogether. I bought a Liquid cooling Kit for the CPU, and used another block for the chipset just so I didn't have to worry about that stupid thing breaking.
My old pc, my fan started making that growling noise everytime I started the computer, so I actually took the fan off of our old Pentium 60 that I was throwing away and put it on there. 10 year old fan, still works better than these new POS that they put on there.