Do you know the exact model of your heatsink? The only one I can find from ThermalTake with dual 80mm fans is the DuoOrb:http://www.thermaltakeusa.com/Product.aspx?C=1148&ID=1748#Tab1
If thats the one then its not a proper cooler for your CPU, its really only rated for LGA775 CPUs from Intel.
If I had a choice of CPU coolers I would go with this one personally:http://www.zalman.com/eng/product/Product_Read.asp?idx=442
Still, the actual model of your current one will help me digure out the issue. Also list your full specs, including case and any case fans you have as well.