The product is equipped with Zalman's patented VFP (Variable Fin Profile) technology. Fan installed inside the heatsink maximizes the cooling efficiency and the product's maximized dissipation surface area provides excellent performance.
Better than expected8/23/2010
Used on a Radeon HD4850. before: -idle: 65-70 C -load: 100-115 C. after: -idle: 25-30 C -load: 40-45 C. Runs quieter and obviously cools better than the stock fan. Most people were stating they were getting 20-30 C drops. i got 40-70 C drops, which is ridiculously worth the money. As for the installation, it was relatively easy, and I'm not the most handy person. My motherboard didn't have another fan controller, so i had to get a 3-pin to molex adapter to connect it directly to my power supply. I have nothing bad to say about it except it may not fit in some peoples' cases as it's fairly large.