Grasp the rear side of the PCI riser-cage touch point and
the front PCI rise-cage suitable location of the PCI riser-cage assembly.
Use your thumb to press down the right hand side bezel (a tiny square
surface) of the GPU tray; then lift it out of the PCI riser-cage out
of the GPU tray.
Figure 1. Front PCI riser-cage assembly removal
Figure 2. Rear PCI riser-cage assembly removal
If a GPU adapter is installed in the PCI riser-cage assembly,
disconnect any cables that are connected to the adapter.
If you are instructed to return the PCI riser-cage assembly,
follow all packaging instructions, and use any packaging materials
for shipping that are supplied to you.