I put an Iceberq4 Pro on a Ti4200 to replace a bad fan on the stock HS. The Iceberq cooled about the same as the stock unit according to my finger test, although I had read tests that showed it cooling a little better. It is high quality, looks real good and is quiet running. The 9800 GPU is surrounded by a "shim" that will keep the HS slightly above the core if the HS is not milled out for this, as is the case with the stock ATI HS. Search around and you will find much info about this "shim" problem and how to correct it.