IBM OpenCAPI Installing And Servicing page 19

Figure 3. Removing GPUs
5. Install the interposer into GPU position 3 as shown in the following figure.
Start with the inner four screws (0.63 in, 16 mm in length). Thread the four inner screws half-way
using the sequence that is shown. After all four screws are threaded, then fully tighten them. Next,
tighten the outer four screws (0.47 in, 12 mm in length) by using the sequence that is shown. Take
care to not damage the system backplane with the screw driver tip.
Installing the OpenCAPI adapter support on the 8335-GTH system 5