Yes it replaces your existing cooler. You unscrew/unclip your old one, and screw this one on in its place. It is then usually plugged into the graphics card, or a 3 pin-molex adapter which comes with it.
The heatsinks for the RAM are then stuck onto the RAM chips using the supplied heat transfer tape


I wounder how hot my old card was unning, seeing as its fan seized up and only cooling was a PCI fan beside it 
