Dell Vostro 5620 Service Manual page 34

NOTE: This is the heatsink for your computer that supports the discrete Graphics Processing Unit (GPU).
NOTE: This is the heatsink for your computer that supports the integrated Graphics Processing Unit (GPU).
Steps
1. In reverse sequential order (7>6>5>4>3>2>1), or (4>3>2>1), whichever is applicable, loosen the seven or four captive
screws, whichever is applicable, that secure the heat sink to the system board.
2. Lift the heat sink from the system board.
34 Removing and installing components