Dell EMC PowerEdge R7525 Installation And Service Manual page 120

Figure 95. Removing the expansion card riser (Riser 3A)
3. To remove expansion card Riser 4A:
a. Disconnect the GPU power cable from the system board.
b. Loosen the captive screw.
c. Press the blue release tab and holding the edges lift the expansion card riser from the riser connector on the system
board.
Figure 96. Removing the expansion card riser (Riser 4A)
120 Installing and removing system components