Dell Alienware Area-51 R3 Threadripper Edition Service Manual page 71

a. PCI fan
b. screws (2)
5. Disconnect the PCI-fan cable and front-bezel heat-sensor cable from their respective connectors on the system board.
6. Remove the PCI fan from the tabs securing it to the chassis.
1. PCI fan
3. PCI-fan cable
5. tabs
7. Remove the four screws (M5x10) securing the fan shroud to the PCI fan.
8. Lift and remove the fan shroud off the PCI fan.
2. front-bezel heat-sensor cable
4. system board
6. chassis
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