Thermaltake in general, and especially the Volcano series, are not known for being quiet. I had a Volcano 11 that ran between 5000-6000 rpms at 12V, and even at 7V and 3200rpms, it was too loud. My suggestion would be to replace the fan, as the heatsink itself is fine. Mine currently sports an L1A, and is plenty happy, and more importantly, quiet.