Dell PowerEdge C4130 Owner's Manual page 120

Steps
1. Remove the screws securing the front I/O bracket to the GPU, and remove the I/O bracket.
2. Remove the screws securing the support bracket to the GPU, and remove the support bracket.
Figure 53. Removing and installing the GPU I/O brackets and the support brackets (Nvidia)
1. support bracket
3. I/O bracket
120
2. GPU
4. screw (7)