[. . . ] STEP 4 GH-PSU21-FB Before installation, please make sure the pin is on the right direction ( as Figure A ). Installation Guide The cooler fan speed levels provided are for reference use only. [. . . ] Malfunction arising from casualties ( earthquake, thunder, fire, and flood ). The devices inside, including power supply, hard disk, CD-ROM drive, motherboard, cooler, etc, are not detached from the chassis prior to the transportation of the computer product, resulting in damage to the cooler or computer-related devices. 9. Any damage caused by nonobservance of the installation instruction contained in this manual. If fan speed control is required, please refer to Installation of Fan Speed control Cable. AMD K8 / AM2 Platform Installation STEP 1 Caution : Features 1. 5. Apply some grease on the CPU properly. Universal design for all LGA775 and AMD AM2 / K8 platforms. Omni-directional high-conducting heat pipe for maximum dissipation in any mounted position. Large 120 mm fan with fan speed control cable, for a quiet and effective operation. [. . . ] Make sure the screws are evenly and firmly fastened. Connect the 3-pin cooler connector to the white connector of the fan speed control cable. [. . . ]