Instructions to remove the top chassis cover can be found here: Removing the Chassis Cover (TS4-1686449 / TS4-187485002 / TS4-1910483)

Step-by-step

Graphics card power cables should be included with your system’s accessory box. They are a bit difficult to replace due to GPU power cable differences that differ depending on your desired graphics card power cable ports.

1. Remove chassis slot shields (if any)

2. Insert expansion card into expansion riser slot, aligning the expansion card bracket with the slots in the rear

3. Secure the expansion card using the same screws used to hold down the removed chassis slot shields

4. Plug in the proper power cables to the motherboard
   
   

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