Zalman ZM80D-HP VGA Heatpipe Cooler, uses Dual heatpipes to enhance the cooling efficiency, the fanless design ensures complete noiselessness and maintenance-free operation, RAM heatsinks for cooling the VGA RAM, Compatibility with virtually all types of VGA cards. (Incompatible with VGA cards that do not have original heatsink holes measuring 3mm in diameter, or VGA cards on which the ZM80D-HP interferes with the card’s components.) If you are using a nVIDIA GeForce FX5800, an ATI Radeon 9800 Pro, a Matrox Parhelia, or a more advanced model, an Optional Fan (ZM-OP1, sold separately) must be installed